colspace takes as argument the matrix A of an linear
application f with respect to the canonical basis.
colspace returns a matrix. The columns of this matrix are a basis of the
subspace generated by the columns of A.
colspace may have a variable name as second argument, where
Xcas
will store the dimension of the subspace generated by the columns of A.
Input :
Output :
Input :
Output :
Then input:
Output :