[PD] matrix operations with audio signals

Derek Holzer macumbista at gmail.com
Wed May 16 18:52:23 CEST 2018

OK that kind of answers my question: it would be easier to write the 
matrix equations out linearly since the use of the [mtx_*~] object is 
not immediately clear to me. Very much still learning this kind of math.


On 16/05/2018 19.46, IOhannes m zmölnig wrote:
> On 05/16/2018 04:56 PM, Derek Holzer wrote:
>> On deeper inspection: [mtx_pack~] gives the same value to an entire row,
> how so?
> if i feed an [osc~ 440] into the first inlet of [mtx_pack~ 3] the first
> row will contain 64 samples of a sine wave.
>> If [matrix~] is used to process the vectors which represent a cube,
>> let's say, and I want the cos, sin, and -sin of the rotation angle R to
>> be audio signals, how could I use [matrix~] to do that?
> first: [matrix~] is deprecated. you should use [mtx_*~] instead. (you
> should get a big fat red warning for each and every [matrix~] object you
> create; if you don't, you are using a version of iemmatrix that is more
> than 15 years old).
> anyhow, what you want to do can be done without [mtx_*~], doing the
> matrix multiplication on paper and then building the patch discretely.
> for simplicity here's a 2D version using [expr~]:
>                         R
>                         |
> X            Y         [expr~ cos($v1);sin($v1)]
> |            |         |              |
> [expr $v1*$v3+$v2*$v4; $v2*$v3-$v1*$v4]
> |                                     |
> gfmasrd
> IOhannes
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derek holzer

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