error using sym>convertChar (line1459)

holle everyone,

When I used GPTIPS for function fitting, the following problem occurred when I used the code----gppretty(gp,'best')

error using sym>convertChar (line 1459)

Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and strings

representing symbolic expressions, use 'str2sym'.

error using sym>tomupad (line 1225)

S = convertChar(x);

error using sym (line 214)

S.s = tomupad(x);

error using gppretty (line 246)

fullExpr = gp.results.best.returnvalues(1) + gp.results.best.returnvalues(2)*sym(evalTree{1});

[Walter Roberson]

Copyrighted code removed.

One of the sources of the code is https://github.com/sicil1ano/Matlab-Genetic-Programming/blob/master/gppretty.m

Answer 1

[Sai Sri Pathuri]

You may refer the following answer

https://www.mathworks.com/matlabcentral/answers/444975-gptips-2-symbolic-regression-error?s_tid=answers_rc1-1_p1_BOTH