Is it possible to create a symbolic matrix whose dimensions are symbolic scalar variables?

Is it possible to create a symbolic matrix whose size is denoted by symbolic scalar variables?

Like this

syms x y
syms z [x y]

where x and y are symbolic scalar variables, and I want to create a symbolic matrix z with a size (x, y).

Answer 1

[Walter Roberson]

No, it is not possible in MATLAB. At the MATLAB level, symbolic arrays are plain arrays of objects, and the arrays have definite size at the MATLAB level.

For reasons I have not worked out yet, symmarray are implemented as having a fixed size even though in a sense they are scalar at the MATLAB level.

[Zijun]

Thanks for your reply. Hope to see this functionality in a later version.

[Walter Roberson]

This is not going to happen for the kind of array that you used. Perhaps at some point it might be supported for symarray

Answer 2

[Gandham Heamanth]

Hi Zijun, here is the small code on how you can create a symbollic matrix whose size is denoted by symbolic scalar variables.

syms x y;
x = 4;
y = 5;
z = sym('z', [x y]);

z = 

[Zijun]

Thanks, Gandham. But if I don't know the value of x and y a priori? For example, I want to generate a file using matlabFunction:

syms x y
syms z [x y]
matlabFunction(z, 'File', 'function_z.m');

There will be a function defined in the file function_z.m:

z=function_z(x,y)

then each time I call the function, I will pass in two arguments x and y such that the size of z is dynamically dependent on x and y.

Is it possible?