how can i convert mxArray to double in simulink?

i am gettting following error.

Expected either a logical, char, int, fi, single, or double. Found an mxArray. MxArrays are returned from calls to the MATLAB interpreter and are not supported inside expressions. They may only be used on the right-hand side of assignments and as arguments to extrinsic functions.

can anyone help me to fix it?

Answer 1

[Martin Oehler]

Try to define the value first. Then, make the call which returns the MxArray.

See https://de.mathworks.com/matlabcentral/answers/354444-is-there-anybody-to-help-me-fix-the-error-and-convert-mxarray-to-double