Returns a column vector containing the index (i.e., row number) of the smallest element in each column of a matrix.
x (NxK matrix) – data
y (Kx1 matrix) – contains the index of the smallest element in each column of x.
// Create random matrix x = round(rndn(5, 4)*5); // Find minimum of each column y = minc(x); // Find indices of minimum of each column z = minindc(x);
If x is equal to:
-5 4 -4 0 -2 3 4 3 x = -11 5 5 5 1 2 7 4 -2 4 -1 -5
then y and z are equal to:
-11 3 y = 2 z = 4 -4 1 -5 5
If x is complex,
minindc() uses the complex modulus (
abs(x)) to determine
the smallest elements.
To find the index of the smallest element in each row, transpose the
matrix before applying
To find the index of the smallest element in a matrix x, use:
colInd = minindc(minc(x)); rowInd = minindc(x[.,colInd]);
If there are two or more “smallest” elements in a column (i.e., two or
more elements equal to each other and less than all other elements),
minindc() returns the index of the first one found, which will be the