Luigi Castelli

In the new method I allocate memory for my matrix structure:

x->matrix = (t_matrix *)sysmem_newptr(sizeof(t_matrix));

Now, I want to be able to set the cell states with an attribute, so in main I declare:

attr = attr_offset_array_new("cell", _sym_pointer, 3, attrflags,

(method)matrix_cell_get, (method)matrix_cell_set, 0L, 0L);

The 1st arg would be the column, the 2nd arg would be the row and the 3rd arg would be the state of the cell (0-1)

At this point I am stuck with one question:

I just want to get the state of a certain cell. I know the column and the row of the cell I want to get.

However the getter method needs to be prototyped as follows:

static t_max_err matrix_cell_get(t_matrix *x, void *attr, long *argc, t_atom **argv)

and I have no way to pass any arguments (column and row) to this method.

How do I declare the cell getter method ?

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typedef struct t_matrix {
    long    cells[4][4];
    long    ncolumns;
    long    nrows;
} t_matrix;

typedef struct t_myUIobj {
    ....
    t_matrix *matrix;
    ....
} t_myUIobj;

x->matrix = (t_matrix *)sysmem_newptr(sizeof(t_matrix));
if (x->matrix == NULL) {
     error("out of memory");
     return 0;
}

attr = attr_offset_array_new("cell", _sym_pointer, 3, attrflags,
        (method)matrix_cell_get, (method)matrix_cell_set, 0L, 0L);
    class_addattr(c, attr);

I just want to get the state of a certain cell. I know the column and the row of the cell I want to get.
However the getter method needs to be prototyped as follows:

and I have no way to pass any arguments (column and row) to this method.
How do I declare the cell getter method ?

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one-question-about-pattr

You can't really do this with attributes - an attribute tends to hold a single value (even if that value consists of a list or a table or whatever). The idea of getting part of an attribute's value is not part of the model.

or whatever. Then, if you want the entire value of the matrix to be available to pattr, you can implement setvalueof and getvalueof and just output a list of the values stored in the matrix.

Alternately, you could create a bunch of attributes: "getcell00", "getcell01", etc. and have access to individual values that way, but what a pain, both to implement and to use.

You can't really do this with attributes - an attribute tends to hold a single value (even if that value consists of a list or a table or whatever). The idea of getting part of an attribute's value is not part of the model. 

as usual, thanks for your quick response.

Yes, I think I'll implement it with regular A_GIMME methods.

That's what makes the most sense in this situation.

Can you expand on this statement, please?

> Then, if you want the entire value of the matrix to be available to pattr, you can implement setvalueof and getvalueof and just output a list of the values stored in the matrix.

How would you make the whole matrix available to pattr with the setvalueof and getvalueof methods ?

Subject: [dev] Re: one question about pattr

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Yes, I think I'll implement it with regular A_GIMME methods.
That's what makes the most sense in this situation.

----- Original Message ----
From: Jeremy Bernstein 
Sent: Saturday, March 8, 2008 2:07:15 AM
Subject: [dev] Re: one question about pattr

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On 9 mars 08, at 02:10, Luigi Castelli wrote:

> How would you make the whole matrix available to pattr with the 

> I am not sure I understand here...
>
> How would you make the whole matrix available to pattr with the  
> setvalueof and getvalueof methods ?

This is the way I did a couple of custom function objects. You just 

traverse the matrix and append everything into one big ol' list.

On Mar 8, 2008, at 5:37 PM, Emmanuel Jourdan wrote:

> On 9 mars 08, at 02:10, Luigi Castelli wrote:

>> How would you make the whole matrix available to pattr with the 

This is the way I did a couple of custom function objects. You just  
traverse the matrix and append everything into one big ol' list.

> On 9 mars 08, at 02:10, Luigi Castelli wrote:
>
>> I am not sure I understand here...
>>
>> How would you make the whole matrix available to pattr with the  
>> setvalueof and getvalueof methods ?
>
>
> You'll have to unroll it I'd guess.
>
> ej
>

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Work: 857-544-3967
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Here is the code I used...hopefully it makes some sense.

t_max_err function_setvalueof(t_function *x, long ac, t_atom *av)

        function_clear(x, gensym("clear"), 0, 0);

        for (i = 0; i < ac; i += 2) {

            values[0] = *(av + i);

            values[1] = *(av + i + 1);

            function_list(x, gensym("list"), 2, values);

t_max_err function_getvalueof(t_function *x, long *ac, t_atom **av)

    for (bp = x->f_list; bp; bp = bp->p_next) {

            // memory has been passed in; use it.

            *av = (t_atom *)getbytes((short)(size * sizeof(t_atom) * 2));

    for (count = 0, bp = x->f_list; bp; bp = bp->p_next, count += 2) {

        atom_setfloat(*av+count,bp->p_x);

        atom_setfloat(*av+count+1,bp->p_y);

t_max_err function_setvalueof(t_function *x, long ac, t_atom *av)
{
	if (ac && av) {
		function_clear(x, gensym("clear"), 0, 0);

		for (i = 0; i < ac; i += 2) {
			values[0] = *(av + i);
			values[1] = *(av + i + 1);
			function_list(x,  gensym("list"), 2, values);
		}
	}

t_max_err function_getvalueof(t_function *x, long *ac, t_atom **av)
{
	t_funpair *bp;

	for (bp = x->f_list; bp; bp = bp->p_next) {
		count++;
	}

	if (ac && av) {
		if (*ac && *av) {
			// memory has been passed in; use it.
		} else {
			*av = (t_atom *)getbytes((short)(size * sizeof(t_atom) * 2));
		}
	}

	for (count = 0, bp = x->f_list; bp; bp = bp->p_next, count += 2) {
		atom_setfloat(*av+count,bp->p_x);
		atom_setfloat(*av+count+1,bp->p_y);
	}

Thanks for your suggestion and the code. It does make sense.

The only hesitation I have in implementing something along those lines is the following:

appending all the matrix values into a big ol' list will easily generate lists that are too large to be safely handled by Max.

a 64x64 matrix will have to generate a list of 4096 atoms.

a 128x128 matrix will generate a list of 16384 atoms.

As you know, lists of this size are not really Max compliant and I personally avoid them in my code.

Subject: Re: [dev] Re: one question about pattr

function_clear(x, gensym("clear"), 0, 0);

function_list(x, gensym("list"), 2, values);

for (bp = x->f_list; bp; bp = bp->p_next) {

*av = (t_atom *)getbytes((short)(size * sizeof(t_atom) * 2));

for (count = 0, bp = x->f_list; bp; bp = bp->p_next, count += 2) {

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The only hesitation I have in implementing something along those lines is the following:
appending all the matrix values into a big ol' list will easily generate lists that are too large to be safely handled by Max.

a 64x64 matrix will have to generate a list of 4096 atoms.
a 128x128 matrix will generate a list of 16384 atoms.

----- Original Message ----
From: barry threw 
Sent: Monday, March 10, 2008 3:36:33 PM
Subject: Re: [dev] Re: one question about pattr

t_max_err function_setvalueof(t_function *x, long ac, t_atom *av)
{
    if (ac && av) {
        function_clear(x, gensym("clear"), 0, 0);

        for (i = 0; i < ac; i += 2) {
            values[0] = *(av + i);
            values[1] = *(av + i + 1);
            function_list(x,  gensym("list"), 2, values);
        }
    }

t_max_err function_getvalueof(t_function *x, long *ac, t_atom **av)
{
    t_funpair *bp;

    for (bp = x->f_list; bp; bp = bp->p_next) {
        count++;
    }

    if (ac && av) {
        if (*ac && *av) {
            // memory has been passed in; use it.
        } else {
            *av = (t_atom *)getbytes((short)(size * sizeof(t_atom) * 2));
        }
    }

    for (count = 0, bp = x->f_list; bp; bp = bp->p_next, count += 2) {
        atom_setfloat(*av+count,bp->p_x);
        atom_setfloat(*av+count+1,bp->p_y);
    }

San Francisco, CA
Work: 857-544-3967
Email: bthrew (at) gmail (dot) com
Web: www.barrythrew.com

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On Mar 10, 2008, at 6:08 PM, Luigi Castelli wrote:

> a 64x64 matrix will have to generate a list of 4096 atoms.

> a 128x128 matrix will generate a list of 16384 atoms.

> As you know, lists of this size are not really Max compliant and I 

I might recommend you store as a file and use the filename for pattr.

> a 64x64 matrix will have to generate a list of 4096 atoms.
> a 128x128 matrix will generate a list of 16384 atoms.
>
> As you know, lists of this size are not really Max compliant and I  
> personally avoid them in my code.
>
> Any thoughts ?

On 11 Mar 2008, at 02:16, Joshua Kit Clayton wrote:

> I might recommend you store as a file and use the filename for pattr.

...or bung them into a database and use pattr for the primary key.

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