Must be a text scalar when using eval() function problems?

n_stress = F./(t.*w);
n_stress = eval(n_stress);

Error using eval
Must be a text scalar.

Error in Carbon90 (line 55)
n_stress = eval(n_stress);

I am unsure as to why I am having issues using the eval() function with a something(underscore)something as the argument because I have not had this problem before.

Answer 1

[Walter Roberson]

eval() is defined only for character vectors and string scalars. It is not defined for numeric values, and it is not defined for symbolic expressions.

If you have a symbolic expression that does not have any unbound variables then you should double() the expression. If it has unbound variables then vpa() the expression.