How to insert a function into a GUI

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Daniel Jaló
Daniel Jaló 2012년 12월 9일
Hi.
I'm making a simple GUI which receives functions and do operations on them. It is complete, however to change the function I need to modify the code and change the function.
Is there anyway to insert a funcion into a GUI as a string and converting it into a function?
e.g: the user inserts x.^2+x
The code receives it as string and converts it to a variable so that
y = x.^2 + x (the x will be defined beforehand)
Thanks in advance. I hope I've expressed my doubt clearly enough. Daniel.

답변 (2개)

Image Analyst
Image Analyst 2012년 12월 9일
Yes, just go ahead and enter it in any place that is not another function. For example at the very end of your code, add this
function y = MyPolynomial(polynomialString, x)
coefficients = ParseString(polynomialString)
y = coefficients(1) * x^2 + coefficients(2) * x + coefficients(3);
function coefficients = ParseString(polynomialString)
equalsLocations = findstr(polynomialString, '=');
plusLocations = findstr(polynomialString, '+');
minusLocations = findstr(polynomialString, '-');
% etc. You do the rest.
  댓글 수: 1
Daniel Jaló
Daniel Jaló 2012년 12월 9일
Thanks for the answer, but that won't allow me to insert any function at will, only a second degree polinomial function. I gave the function as an example, my objective is to be able to convert any function I insert.
Thanks. Daniel

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Walter Roberson
Walter Roberson 2012년 12월 10일
y = str2func(['@(x) ', TheString]);

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