symvar error with Matlab R2023a in MyClampledUniformSpline.m

[jtorde]

In Matlab R2023a, I am getting this error:

Error using symvar
...
Invalid argument at position 1. Value must be a character vector or string scalar.

A possible fix is to change this:

if(numel(symvar(ADiffT'))==0)

to this:

if(numel(symvar(sym(ADiffT')))==0)