如何在MATLAB中检索满足一定标准的矢量系数坐标

Question

给定一个数字向量，我想，例如，检索所有正系数的坐标vector(i,j)，以便进一步处理向量。 MATLAB的语法是什么？

示例：对于[-1.143,0.089,2.654,4.142,]'我想要检索[2,1;3,1;4,1]

Answer 1

%just some random data
M=rand(10,10)-.666
%get all indices which are positive, using logical indexing
positive_indices=M>0;
%get the positive data:
M(positive_indices)
%get the row and column index of the positive data
[r,c]=find(positive_indices)