Getting the percentage of values greater then 0.3 using linear and subscript indexing.

Question

Jared Dube 2022-10-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1825713-getting-the-percentage-of-values-greater-then-0-3-using-linear-and-subscript-indexing

回答： Image Analyst 2022-10-14

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];

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2022-10-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1825713-getting-the-percentage-of-values-greater-then-0-3-using-linear-and-subscript-indexing#answer_1074288

在 MATLAB Online 中打开

% Using logical indexing
A1 = rand(20,30);
pct = 100 * sum(A1 > 0.3, 'all') / numel(A1)
pct = 68.5000
% Using linear indexing
linearIndexes = find(A1 > 0.3)
linearIndexes = 411×1
     4
     5
     6
     7
     9
    10
    11
    12
    13
    16
pct = 100 * length(linearIndexes) / numel(A1)
pct = 68.5000