How to take function as input from textbox?

Question

0 个投票

how can I take a function such as sin(x) or exp(x) as an input from the textbox in MATLAB gui?

t = get(handles.input,'string')
c = conv (t,t)
plot(c)

I have tried this but it does not work.

I want to convolve the signal but I can't figure out how to take input as a function

4 个评论
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Mehmed Saad 2020-5-6

and do you have x or user have to enter it? is it necessary to use text box (you can use dropdown)?

Saad Rana 2020-5-6

yes I have a user to enter it and the textbox is necessary

Answer 1

Mehmed Saad 2020-5-6

0 个投票

You can use any one of the following

For example

The string user enters in text box is

s = 'sin(x)';

eval will evaluate the string assuming that x is variable inside your function workspace in which you are evaluation eval

eval(s)

For feval and str2func user must enter the function name and not the argument

s = 'sin'
feval(s,x)

or

s = 'sin';
f = str2func(s);
f(x)