Wetterberg

I have a series of 16x8 char matrices, and I would like to toggle cells 

between two states, like an on/off thing.

Now, I had the idea of going through a jit.op @op % @val 255, but that's 

about as far as that train of thought took me.

Next I came up with the following - a loop going through a jit.op @op 

fold @val 1, which does work - but that involves going from char to 

float32, and, subsequently, back again. (patch attached)

Is there a simpler way? In max I'd accum->modulo 255, and I guess I'm 

looking for that kind of functionality in Jitter, preferably without 

doing [getcell], which seems quite cumbersome and slow.

Cheers, and I hope I made my question sensible....?

I have a series of 16x8 char matrices, and I would like to toggle cells 
between two states, like an on/off thing.

Now, I had the idea of going through a jit.op @op % @val 255, but that's 
about as far as that train of thought took me.

Next I came up with the following - a loop going through a jit.op @op 
fold @val 1, which does work - but that involves going from char to 
float32, and, subsequently, back again. (patch attached)

Is there a simpler way? In max I'd accum->modulo 255, and I guess I'm 
looking for that kind of functionality in Jitter, preferably without 
doing [getcell], which seems quite cumbersome and slow.

Cheers, and I hope I made my question sensible....?
Andreas.

toggling-cells-in-matrices

The char range is from [0, 255] so if you have a char matrix followed

by [jit.op @op % @val 255], the possible range of output values is

limited to [0, 254]. If you just want to toggle, you might want to

look at logical operations like &&, || etc. A simple toggle can be

The char range is from [0, 255] so if you have a char matrix followed
by [jit.op @op % @val 255], the possible range of output values is
limited to [0, 254].  If you just want to toggle, you might want to
look at logical operations like &&, || etc.  A simple toggle can be
implemented with [jit.op @op !]

To selectively toggle specific cells in a char matrix, you can use [jit.op @op ^], otherwise known as XOR. In bitwise arithmetic, the XOR operator is used to toggle the state of specific bits using a bitmask. So, the @op ^ will toggle any cells that are white in the mask image, and not mess with the black ones.

To selectively toggle specific cells in a char matrix, you can use [jit.op @op ^], otherwise known as XOR.  In bitwise arithmetic, the XOR operator is used to toggle the state of specific bits using a bitmask. So, the @op ^ will toggle any cells that are white in the mask image, and not mess with the black ones.

Wes and Andrew, thanks so much for sharing! :D

Andrew, I realized that even your super-slick example could be 

simplified even more, so here is my final entry - this is going in the 

Please let me know if you have any further tweaks.

Andrew, I realized that even your super-slick example could be 
simplified even more, so here is my final entry - this is going in the 
patch more or less like this.
Please let me know if you have any further tweaks.

> To selectively toggle specific cells in a char matrix, you can use [jit.op @op ^], otherwise known as XOR. In bitwise arithmetic, the XOR operator is used to toggle the state of specific bits using a bitmask. So, the @op ^ will toggle any cells that are white in the mask image, and not mess with the black ones.

... yes, XOR is better than !. Follow ab's advice on this one. sorry

> To selectively toggle specific cells in a char matrix, you can use [jit.op @op ^], otherwise known as XOR.  In bitwise arithmetic, the XOR operator is used to toggle the state of specific bits using a bitmask. So, the @op ^ will toggle any cells that are white in the mask image, and not mess with the black ones.

... yes, XOR is better than !.  Follow ab's advice on this one.  sorry
'bout the brain spasm.
wes


toggling cells in matrices?