str2func operation

Everytime I try to run this operation, it tells me the expression is incomplete but I can't see whats wrong with it.

str1 = input ( 'type an expression that is a function of"y"');

tmp1 = str2func(['@(y,t) ', str1]);

Answer 1

[JESUS DAVID ARIZA ROYETH]

type an expression that is a function of"y"'5*y+5'

here there is no problem, remember the expression goes in single quotes, if you want to save the quotes then change your code for this :

str1 = input ( 'type an expression that is a function of"y"','s');
tmp1 = str2func(['@(y,t) ', str1]);

type an expression that is a function of"y"5*y+5