How can I calculate the grouped data?

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wd w 2024-2-16

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评论： Dyuman Joshi 2024-2-16

I have some grouped data, and intend to perform an element-wise squaring one by one and find out the minimum of calculated results of each grouped data. The following is an example, but unfortunately it doesn't work.

x11 = [1 2 3 6 5 4];

x22 = [11 12 13 16 15 14];

y(ii) = x(ii).^2;

m(ii) = min(y(ii))

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Answer 1

Dyuman Joshi 2024-2-16

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Dynamically naming variables is not a good programming practice - TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

An efficient method is to store the data in an array -

x= [1 2 3 6 5 4; 11 12 13 16 15 14]; 
%Element-wise power
y = x.^2
y = 2×6
     1     4     9    36    25    16
   121   144   169   256   225   196
%Find the minimum of each row
m = min(y, [], 2)
m = 2×1
     1
   121

If the data does not have compatible dimensions for concatenating into a numeric array, consider storing the data in a cell array, and perform operations on the data accordingly.