How to import an equation that is user defined in GUI into separate m files?
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Hi, I am creating a GUI for a project and I want the user to be able to enter an equation. I then want to run a seperate m file with this equation. I have tried global variables to convert it, but it has not been working for me. Thank you
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Walter Roberson
2018년 12월 7일
R2017b or later, use str2sym() and then use matlabFunction() with the 'file' option.
R2017b or earlier use sym() and then use matlabFunction with the 'file' option.
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Stephen23
2018년 12월 7일
편집: Stephen23
2018년 12월 7일
Note that you will need to prefix the string with '@(x,y,..)', exactly as if you were defining an anonymous function. For example:
>> str = 'sin(x)+sqrt(y)';
>> fun = str2func(['@(x,y)',str]);
>> fun(pi/2,2)
ans = 2.4142
It is best to avoid global variables, evalin, assignin, and other such bad code practices.
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Stephen23
2018년 12월 9일
"however I do not get how i use this generated function handle in a seperate .m ..."
A function is just a variable in the workspace. You can pass it to a function, just like any other variable.
"...other than manually entering it."
It is not clear what you mean. You do not describe what you tried or what you expect to happen.
Of course you will have to specify where you want to use this function handle: it will not just magically jumpy from where you define it to inside the function where you want to use it. In any case, the simplest, easiest, and most efficient way to pass that function handle to your function is to ensure that your function is written to accept it as an input argument:
fun = str2func(y_in);
yourOtherFun(fun)
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