Hi Everyone!

I'm new to PD and it seems to me that there is no map-object like in processing, cinder, max/msp and... everywhere for mapping some value from one range to another. Am I just too stupid to find it or is PD really missing such an object?

Anyways, searching would probably have taken longer than making one, so here it is. I thought maybe somebody might need it, i use this thing in almost every patch i made! Shouldn't something like this be in the extended-package?

Tell me if you like it, and if there would have been an easier way

Cheers
Adrian

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

Thanks danarf! While I'm sure this a valuable patch, I don't quite know how to use it. Could you explain this a little further?

Thanks,

Michael

Actually there are the [m_autoscale] and [m_scale] from the rjdj lib

https://github.com/rjdj/rjlib

the method used is not the same, (don't know if it is simpler) but it's vanilla

You're definitely right it is a really usefull object

Hello.

I have this abstraction that may be useful. It's for translating a midi CC range to any desired linear range. If you rip its guts apart you may use it for what you intend to.
Best regards.

Sumidero

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

@Michael: You specify an input range, lets say 0-3. So you put 0 on the 2nd inlet and 3 on the 3rd. Now you specify an output range, lets say 15-300. You put the 15 on the 4th inlet and the 300 on the 5th. (you can also just create the object as [map 0 3 15 300], without using any inlets ) Now every value between 0 and 3 that comes in at the 1st inlet will be mapped to the range 15-300. if a value is higher than 3, or lower than 0 it will be cutoff, and output 0 or 3.
Since I am not very capable with PD, i use it much with other programs (so far), which give you values from 0-1. PD often needs Values from 0-127, so you just create [map 0 1 0 127] and there you go. If you wan't to reverse it you write [map 1 0 0 127]
clear now?

I took a look at the rjdj objects... and they are quite cool! That whole library has some nice stuff in it! Thanks BerengerRecoules! I like that their mapping object has an exponent in it. that is very useful! Mine is bit more minimalist, and limits the values. If i had found this before, i wouldn't have written it...

I've been using this method. You use expr in this format.

[expr (((OldValue - OldMin) * (NewMax - NewMin)) / (OldMax - OldMin)) + NewMin]

When mapping ctl values in, I often start by mapping to the range -1 to 1 which would look like this.

[expr ((($f1 - 0) * (1 - -1)) / (127 - 0)) + -1]

That'll take whatever the ctl value (1-127) coming in and convert it to the rage of -1 to 1. The old min and old max are the min and max of the data coming in and the new min and max represent the range of the values you want.

Hope that helps.