Hello all,

I have just started experimenting with puredata and I have been trying to solve this little problem. Basically, I am trying to add two numbers, but my code is broken down into two separate pd files.

The first file "Add_Two_Numbers_Client.pd" is as follows. It generates a number (in this case a value of 100) every second and called the second file "Add_Two_Numbers.pd" which adds the value of 100 to a number obtained from a hslider and outputs the result back to "Add_Two_Numbers_Client.pd".

Code for Add_Two_Numbers_Client.pd

[toggle]
|
[metro 1000]
|
[100]
|
[Add_Two_Numbers]
|
[print "Sum"]

Code for Add_Two_Numbers.pd

[inlet] [hslider]
| |
| |0\
| /
| /
| /
| /
| /
| /
| |

|
[unpack f f]
| |
[+ 0 ]
|
[outlet]

-----End of code ----

The code doesnt work. I always get the following output irrespective of how the hslider is changed:

"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100
"Sum": 100

What am I doing wrong? Can someone help me out? From a design standpoint, I have to keep the second number (coming from the hslider) in the second file. This is part of a bigger program.

Any help to fix this will be highly appreciated. Thanks.

Hi kc6800,

doesn't work in the way you're trying to use it here. The left inlet of will store and output a list (could be one float) straight away. The right inlet will just store whatever is sent to it. When you send the 100 in the left inlet it's overwriting your stored hslider output.

Replacing with [pack f f] will solve your issue.

However, really none of that is needed if you want to just sum two values. The right inlet of [+ ] will store it's value, so you can do something like this:

[inlet] [hslider]
| /
| /
| /
| /
| /
| /
[+ 0]
|
[outlet]

---- One thing to bear in mind is that if the hslider updates it won't output the updated sum of the values. In that case do something like this:

[inlet] [hslider]
| |
| [t b f]
| / /
| / /
| / /
| / /
| / /
[+ 0]
|
[outlet]

Hi kc6800!

I tried your code and it works fine here. I simply can't see where the problem may exist. Can you upload your patch?

@Jwif said:

doesn't work in the way you're trying to use it here. The left inlet of will store and output a list (could be one float) straight away. The right inlet will just store whatever is sent to it. When you send the 100 in the left inlet it's overwriting your stored hslider output.
Though this behavior is what you'd expect, it isn't actually true. is the same as (append is the default argument). So the right inlet will store list, and it will get tacked on to the end of whatever comes through the left inlet.

It looks to me like kc6800's patch should still technically work.

Ahh crap you're right. Sorry about that, just remembered I alway use it with a bang to the left inlet eeeek.....

Although that being said, it's still a unnecessary way to sum two numbers.

kc6800 can you upload your patch?

Hi Jwif,

It is an unnecessary way to sum two numbers. I am working on a larger application involving many separate PD files and I was just abstracting out a common problem that I was facing in several places in this application.

Here are the two patches that I am working with. I am posting the first one here. I will eply to my message and post the second one shortly.

Thanks to everyone for responding to my question.

http://www.pdpatchrepo.info/hurleur/Add_Two_Numbers_Client.pd

Hi Jwif,

Here is the second file. Thanks again.

http://www.pdpatchrepo.info/hurleur/Add_Two_Numbers.pd

Hey kc6800,

Your patch worked for me, printed out 100 + whatever number I have in the hslider

Hi Jwif,

It still doesn't work for me. I am using pd-0.43-2 on a mac mini. Are there any quirks or issues associated with this configuration?

I am completely confused now. Any suggestions/comments?

Thanks!

Your post made me realise I was on an old version of Pd (0.43-1).

I've just updated to the Pd-0.43-3 from here http://crca.ucsd.edu/~msp/software.html, running on a Macbook Pro, OSX 10.7.4

Your patch still works as intended. I can't think of any reason why it shouldn't work to be honest.

Ok. I added the [t b f] as suggested by Jwif earlier to my code and now it works fine.

Thanks to everyone for the help! This should get me on my way....until the next road-block

Here is the modified code:

Code for Add_Two_Numbers.pd

[inlet] [hslider]
| |
| |0\
| /
| /
| /
| /
| [t b f]
| / /
| / /
| / /
| / /
|/ |

|
[unpack f f]
| |
[+ 0 ]
|
[outlet]

• kc6800

just a thought....

you don't have ANOTHER copy of an abstraction also called Add_Two_Numbers.pd , do you??? if so, maybe pd is picking up that one????

try the attached simplified abstraction, and see how that works???

http://www.pdpatchrepo.info/hurleur/Add_Two_Numbers.pd

oh ok, ignore my post then...

glad u got it sorted