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How to evaluate inline functions each variable at once?

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Lucas Carvalho
Lucas Carvalho 2017-5-13
评论： Lucas Carvalho 2017-5-15
Hello guys! Let's say I have two symbolic functions:
f1 = x1^2+x2;
f2 = x3^2;
When I transform both to inline functions, f1 will be dependent of x1 and x2 and f2 of x3. I have a vector where I store the values for x1,x2,x3. How can I use the inline function with the elements of this vector without having too many or not enough arguments? Can I evaluate the functions one element at once?
Thanks in advance!

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采纳的回答

Walter Roberson
Walter Roberson 2017-5-14
syms x1 x2 x3
f1 = x1^2+x2;
f2 = x3^2;
X = [x1, x2, x3]
nf1 = matlabFunction(f1, 'vars', {X});
nf2 = matlabFunction(f2, 'vars', {X});
Unless you are specifically required to use inline functions by the wording of an assignment (or by a supervisor), you should avoid doing so now. inline functions were fine in MATLAB 4 but early in MATLAB 5, 20 years ago, they were replaced by anonymous functions.
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Lucas Carvalho
Lucas Carvalho 2017-5-15
Thank you very much indeed! My code is now working perfectly!

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更多回答（1 个）

Stephen23
Stephen23 2017-5-14
编辑：Stephen23 2017-5-14
The simplest solution is to use indexing, and define each function to accept a vector input. Here I used function handles because inline functions are being deprecated.
>> f1 = @(x)x(1)^2+x(2);
>> f2 = @(x)x(3)^2;
>> f1(1:3)
ans =
3
>> f2(1:3)
ans =
9
Note that you can convert from symbolic to function handle using matlabfunction.

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