Could Anyone explain how to get a matrix from a patcher and process it inside javascript.

Tutorials explain how to send a processed matrix from javascript out of the [js] object with the outlet() method, to the patcher but not how to retrieve a matrix inside the [js] FROM the patcher.

Could Anyone  explain how to get a matrix from a patcher and process it inside javascript.
What kind of function do I need in JS?

get-a-matrix-from-a-patcher-to-javascript

Here's how to get a matrix object in JS with the same data as the input matrix name.

    // create matrix with the same name as the input matrix

var mat = new JitterObject("jit.matrix", name);

function jit_matrix(name) {
	// create  matrix with the same name as the input matrix
     var mat = new JitterObject("jit.matrix", name);
     var cell = mat.getcell(0, 0);
	post("res: "+cell+"n");
}


Okay, thank you, nice, but how do I process the matrix now?

Does it need to be inside the function itself. After several attempt this not works:

////////////////////////////////////////////////////

var mydimmap = new JitterObject("jit.dimmap");

var mtrx2 = new JitterMatrix(4, "char", 320, 240 );

        var mtrx = new JitterObject("jit.matrix", ext);

        mtrx2.matrixcalc(mtrx, mydimmap);

        outlet(0, "jit_matrix", mydimmap.name);

>>> Javascript TypeError: mtrx2.matrixcalc is not a function, line 15

I can't achieve to process the matrix inside another function anymore.

Okay, thank you, nice, but how do I process the matrix now?
Does it need to be inside the function itself. After several attempt this not works:

////////////////////////////////////////////////////
var mydimmap = new JitterObject("jit.dimmap");
mydimmap.invert = [1, 1];

var mtrx2 = new JitterMatrix(4, "char", 320, 240 );
mtrx2.adapt = 1;

function jit_matrix(ext)
	{
		var mtrx = new JitterObject("jit.matrix", ext);
		mtrx2.frommatrix(mtrx);
		mtrx2.matrixcalc(mtrx, mydimmap);
		outlet(0, "jit_matrix", mydimmap.name);
	}

I can't achieve to process the matrix inside another function anymore.
This lacks in the JS tutorials.


var mtrx = new JitterMatrix(4, "char", 320, 240);

var mtrx = new JitterMatrix(4, "char", 320, 240);
var opfloat;

function bang()
{
	mtrx.op("*", opfloat);
}

function jit_matrix(ext)
{
	{
	mtrx.name = ext;
	}

	{
	 bang();
	}
outlet(0, "jit_matrix", mtrx.name);
}
//////////////////////////


I am aware that this code is elementary for programmers, but I'm not, I'm only an artist and I think Max is really interesting for its accessibility and documentation. Such basic code should be in the doc because it would allow to gain some days ... yes. I think we need needs more JS basic tutorials ...

Anyway thanks for the example, Wes, on how to retrieve the matrix in JS.

Anyway thanks for the example, Wes, on how to retrieve the matrix in JS.
(more, more, more ;-)


Get a matrix from a patcher to javascript?