Print a Matlab Expression as Text

Hey,

I am creating a GUI in which I would like to display an equation as text.

For example, I have the expression:

z = (z).^2+c;

I would like to print the '(z).^2+c' part of this expression so the user knows which equation is selected.

Is this possible to do?

Thanks,

Ben G

[dpb]

Where is this expression coming from and how is it presently stored?

If it is an equation/expression in a text field input by the user, for example, then

>> xpr='z = (z).^2+c;';
>> sprintf(strtrim(xpr(strfind(xpr, '=')+1:end)))
ans =
    '(z).^2+c;'
>> 

[Image Analyst]

Maybe try echo???

echo on;
z = (z).^2+c;
echo off

Lines of code that are executed while echo is on will display in the command window.

[Benjamin Gutierrez]

@dpb currently the expresson is hard coded into the program. The 'user' has to uncomment the desired equation. It is this uncommented hard coded equation which I would like to display in the GUI.

However, I eventually want to enable the user to input their own equation, so I may just implement your solution.

Thanks!

[Walter Roberson]

str2func() to move from a character vector to a function handle.

[Benjamin Gutierrez]

Thank you everyone for the responses.

I ended up entering the expression as a string and using eval() to execute the expression.

I can then use the original string to display in my uicontrol text box using sprintf() like @dpb suggested.

Cheers,

Ben G

[Walter Roberson]

str2func() is more robust than eval()

[Benjamin Gutierrez]

Perfect, I'll switch to using that function.

Thank you.