MATLAB: How to do partial function on input equations

Question

equn='Numerator:';
eqpn=inputdlg(equn);
eqn=str2sym(eqpn);
equd='Denominator:';
eqpd=inputdlg(equd);
eqd=str2sym(eqpd);
syms(symvar(eq));
varprompt='With Respect to Variable:';
var=inputdlg(varprompt);
frac=(eqn)/(eqd);
k=partfrac(str2sym(frac),var);
disp(k)

Error using str2sym (line 46)

Argument must be string, character vector, or cell

array of character vectors.

Error in untitled10 (line 13)

k=partfrac(str2sym(frac),var);

Answer 1

var = str2sym(inputdlg(varprompt));