I will check it late on my mac computer. for the moment I'm not on my computer, so I don't want to waste much time on it now as I think it will work on my computer.
For the moment I'm using your help file patch which is great. Your abstraction is so much more easy to use then from my patch I shared in the beginning.

what I'm trying to do is the following -
I will have 8 different sound files. Each sound file should be in a individual sf-play2~ object.
I will have data from 8 diffrent sensors I'm reading via arduino. Each sensor will report 0 or 1 (if sensor is pressed or not) alongside with analog data of numbers between 0 - 1023.
What I would like to do is that when I'm reading 1 the audio file will play, when reading 0 the audio file will pause . if 1 is held and the audio file arrived to it ends it will continue from the beginning. (loop 1) . I will also have a clocker to report how much time has elpased since sensor is 0. If more then x seconds the audio file will go back to beginnnig so next time sensor is held (1) it will start from the beginnnig.

here is my try with your abstraction.
the green part is to imitate the on off from the sensor. the blue is the analog data from sensor.
the orange part is my try to make a clocker that will start count when sensor is off. The yellow part is for small envelop to avoide clicks when audio is pause and resume.

How can I make the audio file go to the beginning when the orange part is reporting a bang (that time was elapsed) ?
Also - I'm not sure if the yellow section is working. Meaning if it is indeed making an envelope on every pause and resume ? Is that possible?

sfplay~example.pd

Thanks!

edit: the scale of the sensor should be inverted. 0 1023 0 1

edit 2: how can I make the sf-play2~ go back to the beginning of the audio file without starting it immediately?

edit3: how can I load the file to the sf-play2~ object without starting it? if I don't press "all" message it won't load the file. I would lik the file to be loaded to the beginnnig, but to start and play only when receiving data from sensor on off. for the moment if I'm not pressing all message the file won't play.

I decided to redesign the thing, taking a different approach. Rather than try to display two arrays in the same graph, I defined one array (named "$1-array"), the only one which actually gets displayed, using the Put menu. Then I defined two other arrays (named "$1-velocity" and "$1-duration") using [array define], and a horizontal radio button to allow the user to select which of the two arrays to display. When the user clicks on one of the radio button selections, it saves the current contents of $1-array and then copies the contents of the selected array into $1-array.

It works the first time I open the patch, but when I go to close it, PD asks me if I want to save my changes (even though I didn't make any changes, except to the data in the arrays. I don't have "Save contents" checked either. If I say "No", I can open the patch again and it still works. But if I say "Yes", it replaces the original name of the displayed array ("$1-array") with the actual number (for example, "1150-array", as in the screen print below) inside the patch. I'm not sure why it's doing this, or if it's expected behaviour. It doesn't over-write the names of the other two arrays ($1-velocity and $1-duration) inside the patch, though. Any ideas?

The whole thing is getting a little complicated, so I've uploaded the parent patch ("test-array-abs.pd") and the abstraction containing the arrays ("array-abs.pd"). This is the line in "array-abs.pd" that gets changed if I say "Yes". Of course, I could try to remember never to say "Yes", but that's a bit much to ask of the user, I think. And it's kind of annoying to have to answer in the first place.

Before:

#X array \$1-array 32 float 2;

After:

#X array 1161-array 32 float 2;

test-array-abs.pd
array-abs.pd

Hey, I'm trying to get purr-data to work on my fresh Manjaro XFCE install, but it does not work. Any help is greatly appreciated!

$ yay purr-data
7 aur/purrdata-faust 0.18-1 (+0 0.00) 
    Run Faust signal processors in Pd, Purr-Data version
6 aur/purrdata-pure 0.26-1 (+0 0.00) 
    Loader plugin for the Pure programming language, Purr-Data version
5 aur/purrdata-lv2plugin-git 25.e00f302-1 (+0 0.00) 
    LV2 plugin host for Pd, Purr-Data version
4 aur/purrdata-mdnsbrowser-git 8.88d2b0c-1 (+0 0.00) 
    Zeroconf service advertising and discovery for Pd, Purr-Data version
3 aur/purrdata-touchosc-git 44.443c793-1 (+0 0.00) 
    A TouchOSC MIDI bridge for Pd, Purr-Data version
2 aur/purr-data-git 2.12.0.r4366.6d94e10b-1 (+2 0.00) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
1 aur/purr-data 2.12.0.r4346.aeb24d89-1 (+6 0.03) (Out-of-date: 2021-06-17) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 2
:: There are 2 providers available for gconf:
:: Repository AUR
    1) gconf 2) gconf-gtk2 

Enter a number (default=1): ==> 
:: Checking for conflicts...
:: Checking for inner conflicts...
[Aur:2]  gconf-3.2.6+11+g07808097-10  purr-data-git-2.12.0.r4366.6d94e10b-1

  2 gconf                                    (Build Files Exist)
  1 purr-data-git                           
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> a
:: Deleting (1/1): /home/olav/.cache/yay/gconf
:: (1/2) Downloaded PKGBUILD: gconf
:: (2/2) Downloaded PKGBUILD: purr-data-git
  2 gconf                                    (Build Files Exist)
  1 purr-data-git                            (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 
:: (1/2) Parsing SRCINFO: gconf
:: (2/2) Parsing SRCINFO: purr-data-git
==> Making package: gconf 3.2.6+11+g07808097-10 (Wed 09 Feb 2022 10:23:23 PM CET)
==> Retrieving sources...
  -> Cloning gconf git repo...
Cloning into bare repository '/home/olav/.cache/yay/gconf/gconf'...
==> Making package: purr-data-git 2.12.0.r4366.6d94e10b-1 (Wed 09 Feb 2022 10:23:23 PM CET)
==> Retrieving sources...
  -> Cloning purr-data-git git repo...
Cloning into bare repository '/home/olav/.cache/yay/purr-data-git/purr-data-git'...
remote: Enumerating objects: 21531, done.
remote: Enumerating objects: 63399, done.
remote: Counting objects: 100% (1852/1852), done.
remote: Compressing objects: 100% (641/641), done.
remote: Total 21531 (delta 0), reused 0 (delta 0), pack-reused 21531
Receiving objects: 100% (21531/21531), 10.88 MiB | 9.46 MiB/s, done.
Resolving deltas: 100% (17681/17681), done.1 KiB | 704.00 KiB/s
  -> Found 01_xml-gettext-domain.patch388.01 KiB | 704.00 KiB/s
  -> Found gconf-reload.patch
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
==> Validating source files with sha256sums...
    gconf ... Skipped
    01_xml-gettext-domain.patch ... Passed
    gconf-reload.patch ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
remote: Total 63399 (delta 1106), reused 1786 (delta 1052), pack-reused 61547
Receiving objects: 100% (63399/63399), 177.19 MiB | 5.71 MiB/s, done.
Resolving deltas: 100% (33721/33721), done.
  -> Downloading nwjs-sdk-v0.24.4-linux-x64.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 86.7M  100 86.7M    0     0  3966k      0  0:00:22  0:00:22 --:--:-- 8404k
==> Validating source files with md5sums...
    purr-data-git ... Skipped
==> Validating source_x86_64 files with md5sums...
    nwjs-sdk-v0.24.4-linux-x64.tar.gz ... Passed
==> Making package: gconf 3.2.6+11+g07808097-10 (Wed 09 Feb 2022 10:24:19 PM CET)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating gconf git repo...
Fetching origin
  -> Found 01_xml-gettext-domain.patch
  -> Found gconf-reload.patch
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
==> Validating source files with sha256sums...
    gconf ... Skipped
    01_xml-gettext-domain.patch ... Passed
    gconf-reload.patch ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
==> Removing existing $srcdir/ directory...
==> Extracting sources...
  -> Creating working copy of gconf git repo...
Cloning into 'gconf'...
done.
Switched to a new branch 'makepkg'
==> Starting prepare()...
/home/olav/.cache/yay/gconf/PKGBUILD: line 30: patch: command not found
==> ERROR: A failure occurred in prepare().
    Aborting...
 -> error making: gconf

And

yay purr-data
7 aur/purrdata-faust 0.18-1 (+0 0.00) 
    Run Faust signal processors in Pd, Purr-Data version
6 aur/purrdata-pure 0.26-1 (+0 0.00) 
    Loader plugin for the Pure programming language, Purr-Data version
5 aur/purrdata-lv2plugin-git 25.e00f302-1 (+0 0.00) 
    LV2 plugin host for Pd, Purr-Data version
4 aur/purrdata-mdnsbrowser-git 8.88d2b0c-1 (+0 0.00) 
    Zeroconf service advertising and discovery for Pd, Purr-Data version
3 aur/purrdata-touchosc-git 44.443c793-1 (+0 0.00) 
    A TouchOSC MIDI bridge for Pd, Purr-Data version
2 aur/purr-data-git 2.12.0.r4366.6d94e10b-1 (+2 0.00) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
1 aur/purr-data 2.12.0.r4346.aeb24d89-1 (+6 0.03) (Out-of-date: 2021-06-17) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 2
:: There are 2 providers available for gconf:
:: Repository AUR
    1) gconf 2) gconf-gtk2 

Enter a number (default=1): ==> 
:: Checking for conflicts...
:: Checking for inner conflicts...
[Aur:2]  gconf-3.2.6+11+g07808097-10  purr-data-git-2.12.0.r4366.6d94e10b-1

  2 gconf                                    (Build Files Exist)
  1 purr-data-git                           
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> a
:: Deleting (1/1): /home/olav/.cache/yay/gconf
:: (1/2) Downloaded PKGBUILD: gconf
:: (2/2) Downloaded PKGBUILD: purr-data-git
  2 gconf                                    (Build Files Exist)
  1 purr-data-git                            (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 
:: (1/2) Parsing SRCINFO: gconf
:: (2/2) Parsing SRCINFO: purr-data-git
==> Making package: gconf 3.2.6+11+g07808097-10 (Wed 09 Feb 2022 10:23:23 PM CET)
==> Retrieving sources...
  -> Cloning gconf git repo...
Cloning into bare repository '/home/olav/.cache/yay/gconf/gconf'...
==> Making package: purr-data-git 2.12.0.r4366.6d94e10b-1 (Wed 09 Feb 2022 10:23:23 PM CET)
==> Retrieving sources...
  -> Cloning purr-data-git git repo...
Cloning into bare repository '/home/olav/.cache/yay/purr-data-git/purr-data-git'...
remote: Enumerating objects: 21531, done.
remote: Enumerating objects: 63399, done.
remote: Counting objects: 100% (1852/1852), done.
remote: Compressing objects: 100% (641/641), done.
remote: Total 21531 (delta 0), reused 0 (delta 0), pack-reused 21531
Receiving objects: 100% (21531/21531), 10.88 MiB | 9.46 MiB/s, done.
Resolving deltas: 100% (17681/17681), done.1 KiB | 704.00 KiB/s
  -> Found 01_xml-gettext-domain.patch388.01 KiB | 704.00 KiB/s
  -> Found gconf-reload.patch
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
==> Validating source files with sha256sums...
    gconf ... Skipped
    01_xml-gettext-domain.patch ... Passed
    gconf-reload.patch ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
remote: Total 63399 (delta 1106), reused 1786 (delta 1052), pack-reused 61547
Receiving objects: 100% (63399/63399), 177.19 MiB | 5.71 MiB/s, done.
Resolving deltas: 100% (33721/33721), done.
  -> Downloading nwjs-sdk-v0.24.4-linux-x64.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 86.7M  100 86.7M    0     0  3966k      0  0:00:22  0:00:22 --:--:-- 8404k
==> Validating source files with md5sums...
    purr-data-git ... Skipped
==> Validating source_x86_64 files with md5sums...
    nwjs-sdk-v0.24.4-linux-x64.tar.gz ... Passed
==> Making package: gconf 3.2.6+11+g07808097-10 (Wed 09 Feb 2022 10:24:19 PM CET)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating gconf git repo...
Fetching origin
  -> Found 01_xml-gettext-domain.patch
  -> Found gconf-reload.patch
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
==> Validating source files with sha256sums...
    gconf ... Skipped
    01_xml-gettext-domain.patch ... Passed
    gconf-reload.patch ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
==> Removing existing $srcdir/ directory...
==> Extracting sources...
  -> Creating working copy of gconf git repo...
Cloning into 'gconf'...
done.
Switched to a new branch 'makepkg'
==> Starting prepare()...
/home/olav/.cache/yay/gconf/PKGBUILD: line 30: patch: command not found
==> ERROR: A failure occurred in prepare().
    Aborting...
 -> error making: gconf
[olav@AMD-Computer ~]$ yay purr-data
7 aur/purrdata-faust 0.18-1 (+0 0.00) 
    Run Faust signal processors in Pd, Purr-Data version
6 aur/purrdata-pure 0.26-1 (+0 0.00) 
    Loader plugin for the Pure programming language, Purr-Data version
5 aur/purrdata-lv2plugin-git 25.e00f302-1 (+0 0.00) 
    LV2 plugin host for Pd, Purr-Data version
4 aur/purrdata-mdnsbrowser-git 8.88d2b0c-1 (+0 0.00) 
    Zeroconf service advertising and discovery for Pd, Purr-Data version
3 aur/purrdata-touchosc-git 44.443c793-1 (+0 0.00) 
    A TouchOSC MIDI bridge for Pd, Purr-Data version
2 aur/purr-data-git 2.12.0.r4366.6d94e10b-1 (+2 0.00) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
1 aur/purr-data 2.12.0.r4346.aeb24d89-1 (+6 0.03) (Out-of-date: 2021-06-17) 
    Jonathan Wilkes' nw.js variant of Pd-L2Ork (git version)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 2
:: There are 2 providers available for gconf:
:: Repository AUR
    1) gconf 2) gconf-gtk2 

Enter a number (default=1): ==> 2
:: Checking for conflicts...
:: Checking for inner conflicts...
[Aur:2]  gconf-gtk2-3.2.6-5  purr-data-git-2.12.0.r4366.6d94e10b-1

  2 gconf-gtk2                               (Build Files Exist)
  1 purr-data-git                            (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> a
:: Deleting (1/2): /home/olav/.cache/yay/gconf-gtk2
:: Deleting (2/2): /home/olav/.cache/yay/purr-data-git
:: (1/2) Downloaded PKGBUILD: purr-data-git
:: (2/2) Downloaded PKGBUILD: gconf-gtk2
  2 gconf-gtk2                               (Build Files Exist)
  1 purr-data-git                            (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 
:: (1/2) Parsing SRCINFO: gconf-gtk2
:: (2/2) Parsing SRCINFO: purr-data-git
==> Making package: purr-data-git 2.12.0.r4366.6d94e10b-1 (Wed 09 Feb 2022 10:40:58 PM CET)
==> Retrieving sources...
==> Making package: gconf-gtk2 3.2.6-5 (Wed 09 Feb 2022 10:40:58 PM CET)
==> Retrieving sources...
  -> Cloning purr-data-git git repo...
Cloning into bare repository '/home/olav/.cache/yay/purr-data-git/purr-data-git'...
  -> Downloading GConf-3.2.6.tar.xz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 1523k  100 1523k    0     0  1610k      0 --:--:-- --:--:-- --:--:-- 1610k
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-reload.patch
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
  -> Found 01_xml-gettext-domain.patch
  -> Found dbus-dontspew.patch
  -> Found gsettings-data-convert-fix-invalid-schema-path.patch
==> Validating source files with sha256sums...
    GConf-3.2.6.tar.xz ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-reload.patch ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
    01_xml-gettext-domain.patch ... Passed
    dbus-dontspew.patch ... Passed
    gsettings-data-convert-fix-invalid-schema-path.patch ... Passed
remote: Enumerating objects: 63399, done.
remote: Counting objects: 100% (1852/1852), done.
remote: Compressing objects: 100% (641/641), done.
remote: Total 63399 (delta 1106), reused 1786 (delta 1052), pack-reused 61547
Receiving objects: 100% (63399/63399), 177.19 MiB | 9.76 MiB/s, done.
Resolving deltas: 100% (33721/33721), done.
  -> Downloading nwjs-sdk-v0.24.4-linux-x64.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 86.7M  100 86.7M    0     0  11.7M      0  0:00:07  0:00:07 --:--:-- 14.4M
==> Validating source files with md5sums...
    purr-data-git ... Skipped
==> Validating source_x86_64 files with md5sums...
    nwjs-sdk-v0.24.4-linux-x64.tar.gz ... Passed
==> Making package: gconf-gtk2 3.2.6-5 (Wed 09 Feb 2022 10:41:26 PM CET)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Found GConf-3.2.6.tar.xz
  -> Found gconf-merge-schema
  -> Found gconfpkg
  -> Found gconf-reload.patch
  -> Found gconf-install.hook
  -> Found gconf-remove.hook
  -> Found 01_xml-gettext-domain.patch
  -> Found dbus-dontspew.patch
  -> Found gsettings-data-convert-fix-invalid-schema-path.patch
==> Validating source files with sha256sums...
    GConf-3.2.6.tar.xz ... Passed
    gconf-merge-schema ... Passed
    gconfpkg ... Passed
    gconf-reload.patch ... Passed
    gconf-install.hook ... Passed
    gconf-remove.hook ... Passed
    01_xml-gettext-domain.patch ... Passed
    dbus-dontspew.patch ... Passed
    gsettings-data-convert-fix-invalid-schema-path.patch ... Passed
==> Removing existing $srcdir/ directory...
==> Extracting sources...
  -> Extracting GConf-3.2.6.tar.xz with bsdtar
==> Starting prepare()...
/home/olav/.cache/yay/gconf-gtk2/PKGBUILD: line 39: patch: command not found
==> ERROR: A failure occurred in prepare().
    Aborting...
 -> error making: gconf-gtk2

Hi all,
some months ago I've installed Pure Data on my lubuntu 64 bit, now I'm trying to update my Pd 0.50.2 to a newer version.
When I try to update the software list with "sudo apt-get upgrade", in the result I've got this message: <<The repository "http://apt.puredata.info/releases focal Release" does not have a release file>>.

Therefore, if I write sudo apt-get upgrade puredata I receive this message: "puredata is already the newest version (0.50.2-3)."

Now, what's the best way for updating Pure Data and do not lose my preferences?

I see that in the download page, there are many packages:
puredata-core_0.51.4-1_amd64.deb
puredata-core_0.51.4-1~bpo10+1_amd64.deb
puredata-dev_0.51.4-1_all.deb
puredata-extra_0.51.4-1_amd64.deb
puredata-gui_0.51.4-1_all.deb
puredata-gui_0.51.4-1~bpo10+1_all.deb
puredata-utils_0.51.4-1_amd64.deb
puredata-utils_0.51.4-1~bpo10+1_amd64.deb
puredata_0.51.4-1_all.deb
...

I haven't found on the web many information, so here I am.
I'm not a linux and pure Data expert at all and I don't want to do random things.

Many thanks

@ddw_music Yes, i see now what you mean with "function call/return problem". If you put an array or text inside an abstraction, you will get the "multiply defined" message and cannot easily use the same data from different places.

But the text and array functions do provide something like a function call/return structure, where you can have a central storage and access the data from various places, as you mentioned above.

Now that you cannot easily put the text/array inside the abstraction, you still can write abstractions that access the text/array within the main patch by using creation arguments.

Have the array in the main patch, create a general purpose abstraction to access the array data, give the array name as creation argument into the abstraction like [abstr array1] and access the array within the abstraction like [array size $1].

--

There are also ways to put the arrays inside abstractions and avoid "multiply defined", but they are not so obvious. I can expand on this if you like.

@ingox
that would be true, but i am not sure.
thats about array random:
"array random" makes a pseudo-random number from 0 to 1 and outputs its quantile (which will therefore have probabilities proportional to the table's values.)

thats about array quantile:
"array quantile" outputs the specified quantile of the array - so for instance, the 0.5 quantile is the median of the array. This generalizes the "array random" function allowing you to use the same source of randomness on several arrays, for example. Negative numbers in the array are silently replaced by zero. Quantiles outside the range 0-1 output the x values at the two extremes of the array (0 and 99 here).

So if i understand it right, the random array number depends on all array values (the median of the array). and not simply returns one of the array elements randomly?

I addition set the seed of [array random] with [array sum].
Here is a variation: randomseed_array_3.pd perhaps much too complicated anyway, i think for my needs there is enough variation in those examples.

i am not sure if this patch is useful. i tried to find out how to use the -s (struct) flag with the [array] object.
this way it is possible to use data structure arrays with [array]. while it is possible to make data structure arrays with multiple variables [array] accepts only field y from data structure arrays.
interestingly it is 50 times faster to read [get] with [element] pointer than to read [array get] or [array get -s] (with 10000 elements).
with an array with more than 100000 elements the [get] method is the only one that does not take forever...
if i set the pd array with a data structure array with more than 10000 elements, the pd array is not drawn correctly (but the values are still there).

arrayPointer.pd

Keep in mind that resizing an array necessarily will rebuild the dsp graph. This means:

1. dsp is suspended
2. Pd sorts all the signal objects in the running Pd instance so that each will receive its input before generating output
3. once finished, dsp is restored to whatever state it was in before

The reason this must happen is because all of the array handling signal objects like [tabread~] and others cache the array and its size so they don't have to look it up every dsp tick.

Now, if you have audio running and you resize the array, Pd needs some way to immediately tell all the table-related objects the new size. For example-- suppose you are shrinking the array. If Pd doesn't update the relevant objects to cache the new array size, a signal object may try to index past the end of the array. This would end up causing a crash in Pd. (Not to mention that a resized array might live in a new location in memory, but that's another story.)

So the question is-- how does Pd immediately tell all the table-related objects which have cached a particular array that you've just resized that array?

Unfortunately, Pd's internal API doesn't have a standard method by which to update the array/size for table-related classes. The only required method it has is "dsp" which adds a signal object to the dsp graph. Most of the table-related objects have a "set" method, but it's not required and I'm not sure if every external array-handling class has one.

That means the only way to tell the table objects to update their array size is to trigger their "dsp" methods. And the only way to do that safely is to rebuild the entire dsp graph. So that's what Pd does.

Anyway, the rebuilding happens all at once. So if your patch is pretty small Pd might be able to sneak a graph rebuild into a single dsp tick on schedule and avoid dropouts. For larger, complex patches it's probably impossible to avoid dropouts. (Plus who knows what the worst-case time is for allocating memory for a large array.)

@cuinjune hi. "array get emulation" works but outputs the whole array, while with the pure data "array get" you can also set "first index to output" and "number of points". same for the pure data "array set" while the number of points is defined by the length of the input list and the array isnt resized (the set values are inserted).
array set emulation doesnt work for me, it just resizes the array (win10 pd64bit).
but should define a new array and not just insert some values?
here i tried to emulate pure data "array set" with the "setAt" method:
array_set_emulation.pd

but the last value of the list is always written to the last value of the array, doesnt matter which onset value is set.
i think because of the code in ofeliaBindings.h "n=size-1" which is meant for setting a single value?

void setAt(int n, t_floatarg f)
    {
        t_garray *a; int size; t_word *vec;
        if (exists(&a) && getData(a, &size, &vec))
        {
            if (n < 0) n = 0;
            else if (n >= size) n = size - 1;
            vec[n].w_float = f;
            garray_redraw(a);
        }```

Hi all,

I needed to have some more long-running visualisation of waveforms in PD, so as there is no vanilla [scope~] object, I thought I'd use [tabwrite~] with [array], as commonly recommended - however, I have stumbled upon a somewhat strange behavior, which I'm not sure whether it's a bug. This is on Ubuntu 18.04, vanilla Puredata from Ubuntu repos (0.48.1-3)

So, basically I made a patch, which is mostly reused help of [tabwrite~] :

The patch itself is here: test-array-scopevis-metro.pd

So, basically, I want to view signals as if on a scope with timebase of 1 second. My PD/Media/Audio Settings tells me: Sample rate: 44100, Block size: 64, Delay (msec): 25

So, all I have in addition to what was there in the [tabwrite~] help, is a few objects to set the array98 array size to 44100 when the patch is loaded - so there is enough memory to record 1 second of signal. And then I've added a metro, so it bangs the tabwrite~ each second (each 1000 msec) - the idea being that I bang the tabwrite~, it records 44100 samples in a second and shows them, then after that second I bang again, it records 44100 samples in a second and shows them anew and so on - pretty much like an oscilloscope at a timebase of 1 sec would do.

However, the actual response is shown in this video:

test-array-scopevis-metro.ogv

That is, when I start the metro at 1000 msec, it keeps banging for at least 10 times, without the array ever refreshing the waveform display?! Then, when I stop the metro, the waveform is displayed ?! At that point, I draw whatever in the array graph so as to "reset" this display, change the metro to 1001 msec - and start the metro again. This time the display does update as expected - but only after an initial delay of some 2 seconds (or three bangs) - I would have otherwise expected a delay of 1 second (two bangs).

Does anyone knows why this happens, and how to get a more reliable behavior for this kind of case? My guess is, for a [metro 1000], PD actually does not have enough time to fill the entire array with all 44100 samples, and thus it never updates the graph - apparently 1 millisecond extra is enough for PD to realize that the array has been filled, and so it updates the graph, but then why does it take 2 sec (at 3rd bang) to update, and not only 1 second (at 2nd bang)?