Converting sting to variable

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Sachin Dighe
Sachin Dighe on 16 Dec 2020
Commented: Sachin Dighe on 18 Dec 2020
Hello everyone,
I am working on a matlab code.
I have a function in terms of x, say (x)^2 + x.
I want to find values of this function for different values of x, say from 1 to 5.
For that I am using a 'for' loop.
Example,
For x = 1 : 5
fx(x,1) = (x)^2 + x
End
But problem is that, this is not the only function. I want these values for any other functions of 'x', say cos(x), etc.
And I want this function to be given by a user as a sting in terms of 'x' either as an input in a cell or as input in inputbox and then I want to use this in 'for' loop.
This is like converting a string to function with variable as 'x'.
Please help me. How to do this.
Thank you in advance

Accepted Answer

David Hill
David Hill on 16 Dec 2020
a='3*x.^2+2*x-5';%if you input your function to support arrays, then no for-loop is needed.
y=str2func(['@(x)',a]);
z=y(1:10);
  2 Comments
the cyclist
the cyclist on 16 Dec 2020
... and you could use inputdlg to get the string from the user.
Sachin Dighe
Sachin Dighe on 18 Dec 2020
Thank you, it is working. Now how to convert function back to number?

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