Function to find max value from function cell array

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Spyros Polychronopoulos
回答： Alex Mcaulley 2019-6-10
Hi there,
I have a 3 elements cell array:
A{1} = @(y) {1*y};
A{2} = @(y) {2*y};
A{3} = @(y) {3*y};
And I want to create a function that will output the maximum value of all 3 elements of A. The below is not working for y=3 or any value of y:
B = @(y) cellfun(@(x) max(x), A{1,:}(y), 'UniformOutput', false);
B(3)
any ideas?
Thanks in advance
  6 个评论
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Adam
Adam 2019-6-10
Well, actually that should be fine:
B = @(y) cellfun(@(func) max(func(y)), A, 'UniformOutput', false);
should work. As y is just passed as a fixed variable to the cellfun rather than one that the cellfun itself is trying to operate over.
Spyros Polychronopoulos
Spyros Polychronopoulos 2019-6-10
I tried that already. Is this working for you?
A{1} = @(y) {1*y};
A{2} = @(y) {2*y};
A{3} = @(y) {3*y};
B = @(y) cellfun(@(func) max(func(y)), A, 'UniformOutput', false);
B(3)

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Alex Mcaulley
Alex Mcaulley 2019-6-10
I see to possible answers depending on what you want:
If you want to obtain the maximum value (for the three functions) for each y:
A{1} = @(y) 1*y;
A{2} = @(y) 2*y;
A{3} = @(y) 3*y;
B = @(y) arrayfun(@(y) max(cellfun(@(func) func(y), A)),y);
y = [1,2,3,4,5]
B(y) =
ans =
3 6 9 12 15
If you want the maximum value of each separate function for all values of y the answer is the one given by @Adam:
B = @(y) (cellfun(@(func) max((func(y))), A, 'UniformOutput', false))
y = [1,2,3,4,5]
B(y) =
ans =
1×3 cell array
[5] [10] [15]

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