Getting the percentage of values greater then 0.3 using linear and subscript indexing.
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Jared Dube
on 14 Oct 2022
Answered: Image Analyst
on 14 Oct 2022
Hi all, I'm currently trying to find the percentage of values greater than 0.3 through just linear and subsccript indexing. I'm currently using logic indexing but I'm not sure how to do it without logic indexing. Any help would be very much appreciated. My current code is below.
clearvars
clc
close all
A1 = rand(20,30);
B1 = A1 > .3;
C1 = A1(B1);
D1 = sum(C1,1)./(20.*30).*100;
A2 = rand(50,50);
B2 = A2 > .3;
C2 = A2(B2);
D2 = sum(C2,1)./(50.*50).*100;
A3 = rand(100,100);
B3 = A3 > .3;
C3 = A3(B3);
D3 = sum(C3,1)./(100.*100).*100;
A4 = rand(200,200);
B4 = A4 > .3;
C4 = A4(B4);
D4 = sum(C4,1)./(202.*200).*100;
PRCT03 = [D1 D2 D3 D4];
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Accepted Answer
Image Analyst
on 14 Oct 2022
% Using logical indexing
A1 = rand(20,30);
pct = 100 * sum(A1 > 0.3, 'all') / numel(A1)
% Using linear indexing
linearIndexes = find(A1 > 0.3)
pct = 100 * length(linearIndexes) / numel(A1)
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