max value of N arrays

Question

simone zappalà 2022-5-25

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回答： Voss 2022-5-25

I've several arrays, all are 130 rows and 1 column with different numbers created from a for cycle, so every row is the result of a for cycle i=1:130. I want to know how i can take the max value between these arrays for every cycle. At the end i need an array with 130 rows and one column each row is the max value between all the arrays.

example

x=[1,3,6,9]

y=[2,4,5,8]

max(x,y)=[2,4,6,9]

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Answer 1

Voss 2022-5-25

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You say they're column vectors in the description, but the example uses row vectors. It doesn't really matter, you can do it either way:

x=[1,3,6,9]; % row vectors given
y=[2,4,5,8];
z=[0,5,1,2];
max([x;y;z],[],1) % row vector result
ans = 1×4
     2     5     6     9
x=[1;3;6;9]; % column vectors given
y=[2;4;5;8];
z=[0;5;1;2];
max([x y z],[],2) % column vector result
ans = 4×1
     2
     5
     6
     9

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Answer 2

MJFcoNaN 2022-5-25

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You can concatenate all the vectors and use function of max by the given dimension. For example

x=[1,3,6,9].';
y=[2,4,5,8].';
A=[x, y]
A = 4×2
     1     2
     3     4
     6     5
     9     8
m=max(A, [], 2)
m = 4×1
     2
     4
     6
     9