getRank beta
This computes the rank of the form $\beta$
i1 : beta = makeDiagonalForm(QQ, (3,5,7,11)) o1 = | 3 0 0 0 | | 0 5 0 0 | | 0 0 7 0 | | 0 0 0 11 | o1 : GrothendieckWittClass
i2 : getRank beta o2 = 4
i3 : M = matrix(QQ, {{1,4,7},{4,3,-1},{7,-1,5}}) o3 = | 1 4 7 | | 4 3 -1 | | 7 -1 5 | 3 3 o3 : Matrix QQ <-- QQ
i4 : getRank M o4 = 3
The object getRank is a method function.