Create function such that for each element of the vector it applies different function

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Dawid Wysocki 2020-12-30

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https://ww2.mathworks.cn/matlabcentral/answers/705388-create-function-such-that-for-each-element-of-the-vector-it-applies-different-function

评论： Ameer Hamza 2020-12-30

Let's say I have following functions:

f1 = @(x) a*x(1) + 1;
f2 = @(x) b*x(2) - 1;

where a and b are parameters that I want to specify before. And a vector:

x = [2;4];

I want to create function handler F that will be created before hand (like a delegation in C#) using a and b. I want to use F to calculate next vector values (f1 for first cell, f2 for second) for instance given a = b = 1:

F(x) = [3;3];

I tried creating cell:

F = {f1;f2}

but it gives me an error "Index exceeds the number of array elements (2).".

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Answer 1

Ameer Hamza 2020-12-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/705388-create-function-such-that-for-each-element-of-the-vector-it-applies-different-function#answer_587368

编辑：Ameer Hamza 2020-12-30

在 MATLAB Online 中打开

Try something like this

a = 1;
b = 1;
x = [2; 4];
f1 = @(x) a*x(1) + 1;
f2 = @(x) b*x(2) - 1;
F = @(x) [f1(x); f2(x)];

Result

>> F(x)
ans =
     3
     3

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Dawid Wysocki 2020-12-30

Thank you so much!

Ameer Hamza 2020-12-30

I am glad to be of help!

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Create function such that for each element of the vector it applies different function

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Create function such that for each element of the vector it applies different function

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