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calculating size of column with specified value in the column

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Anu Sharma
Anu Sharma 2022-3-19
回答： Torsten 2022-3-19
For calculating the values of e1 == 1, the code is
D1 = e1(e1(:,2)==1);
r1 = size(D1);
DDDx = r1(1,:);
I want to calculate the values for comparing 50 values
For example
D2 = e1(e1(:,2)==2);
r2 = size(D2);
DDDx2 = r2(1,:);
D3 = e1(e1(:,2)==3);
r3 = size(D3);
DDDx3 = r3(1,:);
.
.
.
D50 = e1(e1(:,2)==50);
r50 = size(D50);
DDDx50 = r50(1,:);

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回答（1 个）

Torsten
Torsten 2022-3-19
DDDx = zeros(50,1);
for i = 1:50
DDDx(i) = numel(e1(e1(:,2)==i));
end

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