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Create a function from user input string

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Jared
Jared 2011-11-23
编辑： Stephen23 2018-11-7
I am trying to develop a GUI which will allow the user to type a function into a text box and then perform operations to that function. For example suppose the user inputs 'x^2+2x+3' into a text box.
How can I convert the string into a function so I can perform iterative operations on?
such as:
function [y] = f(x)
y=x^2+2x+3;
end
I am fairly new at matlab so any help would be appreciated.

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-11-23
>> str='x^2+2*x+3'
str =
x^2+2*x+3
>> f=inline(str)
f =
Inline function:
f(x) = x^2+2*x+3
>> f(2)
ans =
11
  2 个评论
klement omeri
klement omeri 2018-11-7
Is there any other way to do this? I am doing it in the same way but matlab shows me a yellow warning that inline function will be removed in a future release.
Stephen23
Stephen23 2018-11-7
编辑：Stephen23 2018-11-7
@klement omeri: read the very first line of the inline help, which states "inline will be removed in a future release. Use Anonymous Functions instead." And then use an anonymous function, just like the documentation advises. For example (from the help):
>> str = '@(x)7*x-13';
>> fh = str2func(str);
>> fh(3)
ans =
8

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更多回答（1 个）

Walter Roberson
Walter Roberson 2011-11-23

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