This returns a list with two entries, first a list of random rows, and then a list of random columns. These specify a random submatrix of the desired size, n1.
i1 : R = QQ[x,y,z]; |
i2 : M=matrix{{x^2,x^3,x^4},{y^4,y^2,y^3},{z^3,z^4,z^2}};
3 3
o2 : Matrix R <--- R
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i3 : chooseRandomSubmatrix(2, M)
o3 = {{1, 2}, {2, 1}}
o3 : List
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The object chooseRandomSubmatrix is a method function with options.