How do I evaluate a function within a string such as 'sin(x)' for given x values?

I am making a program which allows for user input of different functions. I made a dialog box with inputdlg, but the result was a string and I cant figure out how to evaluate the given function numerically.

This is the input part of the code so far. What am I doing wrong?

func=inputdlg('Input Function: y=') func1=str2num(func)

I have also tried using eval()

func=inputdlg('Input Function: y=') func1=eval(func)

My goal is that when someone inputs sin(x), the result is func='sin(x)' and func1 is sin(x) evaluated for the x-values.

Thanks!

Answer 1

[Star Strider]

This will get you started:

func = inputdlg('Input function y = ')
fh = str2func(char(func))
y = fh(pi/6)

The str2func function is under ‘Function Handles’ in the documentation. (I had to search for it.)