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

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Zijun
Zijun 2023-7-7
评论： Walter Roberson 2023-7-7
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).

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Walter Roberson
Walter Roberson 2023-7-7
编辑：Walter Roberson 2023-7-7
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.

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Gandham Heamanth
Gandham Heamanth 2023-7-7
Ran in:
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 = 
  1 个评论
Zijun
Zijun 2023-7-7
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?

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