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Converting sting to variable

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Sachin Dighe
Sachin Dighe 2020-12-16
评论： Sachin Dighe 2020-12-18
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

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采纳的回答

David Hill
David Hill 2020-12-16
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 个评论
the cyclist
the cyclist 2020-12-16
... and you could use inputdlg to get the string from the user.
Sachin Dighe
Sachin Dighe 2020-12-18
Thank you, it is working. Now how to convert function back to number?

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