Count values in the given array

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Turbulence Analysis 2023-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/2036576-count-values-in-the-given-array

评论： Star Strider 2023-10-21

matlab.mat

Hi,

In the attached array, column 1 got two values -3.14 and -3.84 and on column 2 some values are 0 and some are 1. I need to check how many zeros and 1 are in -3.14 and -3.84.

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Answer 1

Star Strider 2023-10-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2036576-count-values-in-the-given-array#answer_1338051

编辑：Star Strider 2023-10-21

在 MATLAB Online 中打开

matlab.mat

Try this —

LD = load('matlab.mat');
AA4 = LD.AA4
AA4 = 716×2
   -3.4100         0
   -3.4100         0
   -3.4100         0
   -3.4100         0
   -3.4100    1.0000
   -3.4100         0
   -3.4100         0
   -3.4100         0
   -3.4100    1.0000
   -3.4100         0
[UAA4,ix1,ix2] = unique(AA4(:,1));
Zeros = accumarray(ix2, (1:numel(ix2))', [], @(x)nnz(AA4(x,2) == 0));
Ones = accumarray(ix2, (1:numel(ix2))', [], @(x)nnz(AA4(x,2) == 1));
NrZeros = table(UAA4, Zeros, Ones)
NrZeros = 2×3 table
    UAA4     Zeros    Ones
    _____    _____    ____

    -3.84     303      71 
    -3.41     232     110 