Re: [R] convex nonnegative basis vectors in nullspace of matrix

Hi the solution with linear programming works very well! Even if I take more 'realistic' matrices with dimensions of about 25x60, the calculation of the basis goes well (if I increase the number of iterations to 1000). Meanwhile I also found an algorithm for an exact calculation of the extreme ray

Re: [R] convex nonnegative basis vectors in nullspace of matrix

On Wed, Apr 11, 2012 at 06:04:28AM -0700, capy_bara wrote: > Dear all, > > I want to explore the nullspace of a matrix S: I currently use the function > Null from the MASS package to get a basis for the null space: > > S = matrix(nrow=3, ncol=5, c(1,0,0,-1,1,1,1,-1,-1,0,-1,0,0,0,-1)); S > > MASS:

Re: [R] convex nonnegative basis vectors in nullspace of matrix

On Wed, Apr 11, 2012 at 06:04:28AM -0700, capy_bara wrote: > Dear all, > > I want to explore the nullspace of a matrix S: I currently use the function > Null from the MASS package to get a basis for the null space: > > S = matrix(nrow=3, ncol=5, c(1,0,0,-1,1,1,1,-1,-1,0,-1,0,0,0,-1)); S > > MASS:

[R] convex nonnegative basis vectors in nullspace of matrix

Dear all, I want to explore the nullspace of a matrix S: I currently use the function Null from the MASS package to get a basis for the null space: > S = matrix(nrow=3, ncol=5, c(1,0,0,-1,1,1,1,-1,-1,0,-1,0,0,0,-1)); S > MASS::Null(t(S)) My problem is that I actually need a nonnegative basis for