Apply a conditon for each row apart in a matrix

Question

Nour BS 2016-1-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/264359-apply-a-conditon-for-each-row-apart-in-a-matrix

编辑： Stephen23 2016-1-19

Hello,

My problem here is: If I have for example a matrix F=[0 0.6250 1; 0.7 0 1; 0.5833 1 0] and I have a random number 'r' (between 0 and 1) for example r=0.5278. I have a condition "if F(i,j)>=r" it will return the first elements (for each row) which accept the condition, so I will get as a result the vector v=[0.6250 0.7 0.5833]. My problem here is how can I apply the condition above for each row apart in my matrix.

I am new to matalb. Any response will be greatly appreciated.

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Answer 1

Stephen23 2016-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/264359-apply-a-conditon-for-each-row-apart-in-a-matrix#answer_206705

编辑：Stephen23 2016-1-19

在 MATLAB Online 中打开

F=[0 0.6250 1; 0.7 0 1; 0.5833 1 0];
r=0.5278;
% rotate the matrix:
G = F.';
C = size(G,1);
% identify all values greater than r:
X(2:C+1,:) = G>=r;
% identify only first in each column:
Y = 0<diff(X,1,1);
Z = 1==cumsum(Y,1) & Y;
% get the values:
out = G(Z)