Patrick Gelin wrote:
> Raymond Toy wrote:
>
>> nullspace(A)
>
> ok, I tried nullspace(A) with my matrix:
>
> (%o11) matrix([-2,-5,8,0,-17],[1,3,-5,1,5],[3,11,-19,7,1],[1,7,-13,5,-3]
> (%i12) nullspace(%);
> (%o12) span(matrix([0],[1],[1/5],[-1],[-1/5]),matrix([1],[0],[-3/5],[-2]
> [-2/5]))
>
> maxima find out a different solution of my book! this is the solution of my
> book:
>
> [-1] [-1]
> [2] [-3]
> { [1], [0] }
> [0] [5]
> [0] [1]
If you look carefully, you'll see that maxima's answer is equivalent to
the text book answer. The first column is 2*span1-span2 and the second
column is -3*span1-span2, where span1 and span2 are the two columns
given by maxima.
>
>
> By the way I need the reduced form too and not only the null space...
Ok. I don't know if maxima already has a function for the reduced form.
It shouldn't be two hard to get, though.
Ray