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

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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.

Accepted Answer

Walter Roberson
Walter Roberson on 28 Sep 2022
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.

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