Converting sting to variable

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

Answer 1

[David Hill]

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);

[the cyclist]

... and you could use inputdlg to get the string from the user.

[Sachin Dighe]

Thank you, it is working. Now how to convert function back to number?