Jean-Francois Charles

There must be a simple answer to this one, but I can't figure it out: how to reference, for instance, plane 0 of a matrix? I'm looking for the equivalent of how [jit.submatrix] references a particular set of cells, but for a plane instead of the dimension values.

[jit.unpack] is not what I'm looking for: it's not referencing the planes, but copying them into new matrices.

I'm looking for a "reference mode" [jit.unpack].

I think it's not possible with [jit.matrix]'s srcdim capabilities: it works with dim as well, not planes.

Am I missing something? Thanks for any tips.

There must be a simple answer to this one, but I can't figure it out: how to reference, for instance, plane 0 of a matrix? I'm looking for the equivalent of how [jit.submatrix] references a particular set of cells, but for a plane instead of the dimension values.
[jit.unpack] is not what I'm looking for: it's not referencing the planes, but copying them into new matrices.
I'm looking for a "reference mode" [jit.unpack].
I think it's not possible with [jit.matrix]'s srcdim capabilities: it works with dim as well, not planes.
Am I missing something? Thanks for any tips.


reference-to-a-particular-plane-of-a-matrix

In jit.expr you could reference in[0].p[0]

Not a reference addressing: the plane is copied to the output of [jit.expr], the same way [jit.unpack] works.

This solution is "impure" because it does copy the plane and then put it back in the same matrix, but it doesn't copy or alter the other planes of the original matrix.

Yes, the out_name attribute is a way to save some matrix copying.

Interesting in your patch: we have to specify the dim of the jit.pack: [jit.pack 4 char 4 4 @out_name...], otherwise the named matrix is re-dimensioned to 1 1 (at least on my Mac, tested on Max 6 & 7).

I guess there is currently no way to reference a plane.

It could be a new feature added to [jit.submatrix]..., something like a plane or planemap attribute.

Yes, the out_name attribute is a way to save some matrix copying.
Interesting in your patch: we have to specify the dim of the jit.pack: [jit.pack 4 char 4 4 @out_name...], otherwise the named matrix is re-dimensioned to 1 1 (at least on my Mac, tested on Max 6 & 7).

I guess there is currently no way to reference a plane.
It could be a new feature added to [jit.submatrix]..., something like a plane or planemap attribute.


Reference to a particular plane of a matrix?