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find — find indices of boolean vector or matrix true elements
[ii]=find(x [,nmax]) [i1,i2,..]=find(x [,nmax])
| x | : may be a boolean vector, a boolean matrix, a boolean hypermatrix, a "standard" matrix or hypermatrix |
| nmax | : an integer giving the maximum number of indices to return. The default value is -1 which stands for "all". This option can be used for efficiency, to avoid searching all indices. |
| ii, i1, i2, .. | : integer vectors of indices or empty matrices |
If x is a boolean matrix,
ii=find(x) returns the vector of indices i for which x(i) is "true". If no true element found find returns an empty matrix.
[i1,i2,..]=find(x) returns vectors of indices i1 (for rows) and i2 (for columns),.. such that x(i1(n),i2(n),..) is "true". If no true element found find returns empty matrices in i1, i2, ...
if x is a standard matrix or hypermatrix find(x) is interpreted as find(x<>0)
find([]) returns []
A=rand(1,20); w=find(A<0.4) A(w) w=find(A>100) B=rand(1,20); w=find(B<0.4,2) //at most 2 returned values H=rand(4,3,5); //an hypermatrix [i,j,k]=find(H>0.9) H(i(1),j(1),k(1))
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