Transforming a row (inside a matrix) with equal numbers into a row with only one number

Question

Alberto Acri 2023-11-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2041436-transforming-a-row-inside-a-matrix-with-equal-numbers-into-a-row-with-only-one-number

编辑： Dyuman Joshi 2023-11-1

I have amatrix of the following type:

in = [228 228 228
231	231
183	183
157	157
168	168];

I need to know if the 3 columns of each row are equal and, if they are, get an Rx1 matrix at the end:

out = [228; 231; 183; 157; 168];

If they are not, keep the initial matrix Rx3 ('in' matrix) and tell me in which row the values of the three columns are not the same.

in_new = [228 228 228
231	231	231
183	200	183
157	157	157
168	168	200];
out_new = [3;5];

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Answer 1

Dyuman Joshi 2023-11-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2041436-transforming-a-row-inside-a-matrix-with-equal-numbers-into-a-row-with-only-one-number#answer_1344731

编辑：Dyuman Joshi 2023-11-1

在 MATLAB Online 中打开

in1 = [228 228 228
231	231	231
183	183	183
157	157	157
168	168	168];
[a1, b1] = transform(in1)
a1 = 5×1
   228
   231
   183
   157
   168
b1 =

     []
in2 = [228 228 228
231	231	231
183	200	183
157	157	157
168	168	200];
[a2, b2] = transform(in2)
a2 = 5×3
   228   228   228
   231   231   231
   183   200   183
   157   157   157
   168   168   200
b2 = 2×1
     3
     5
function [out, out_new] = transform(in)
idx = all(~diff(in, [], 2), 2);
if all(idx)
    out = in(:,1);
    out_new = [];
else
    out = in;
    out_new = find(~idx);
end
end