Help with MuPAD function (stats::covariance) error at Matlab

My code is below. Could you help me to avoid the below error?

syms x1 y1 x2 y2;

z=feval(symengine,'stats::covariance',[x1, y1],[x2, y2]);

>> ex

Error using mupadengine/feval (line 163)

Some data are of invalid type.

Error in ex (line 2)

z=feval(symengine,'stats::covariance',[x1, y1],[x2, y2]);

Answer 1

[Walter Roberson]

This requires an advanced symbolic toolbox trick.

symLIST = @(varargin)feval(symengine,'DOM_LIST',varargin{:});

syms x1 y1 x2 y2

z = feval(symengine, 'stats::covariance', symLIST(x1, y1), symLIST(x2, y2));

when you see a MuPAD call documented with [] around the argument, then that is a DOM_LIST argument and you have to construct that specially from MATLAB. When you try to use normal [] list and pass that to MuPAD then what gets passed is DOM_MATRIX

[JP]

Dear Walter Roberson; Thank you very much. Based on your answer, I changed my code a bit. But again, I have an error message. Could you help me figure out what's wrong? Thank you in advance!

symMATRIX= @(varargin)feval(symengine,'DOM_MATRIX',varargin{:});

syms m x;

r1=normrnd(0,1,[1,2]);

r2=normrnd(0,1,[1,2]);

x1=m*r1;

y1=x*r2 + m*r1;

z = feval(symengine, 'stats::covariance', symMATRIX(x1), symMATRIX(y1));

>>

Error using mupadengine/feval (line 163)

The number of data is incorrect.

Error in ex1 (line 8)

z = feval(symengine, 'stats::covariance', symMATRIX(x1), symMATRIX(y1));

[Walter Roberson]

you need to use DOM_LIST for the interference