Matrix

The matrix module defines a number of 2D matrix objects, notably the ScipyMatrix() and NumpyMatrix(). Matrix objects support basic addition and subtraction operations and provide a consistent insterface for solving linear systems. Matrices can be converted to numpy arrays via toarray or scipy matrices via toscipy.

class nutils.matrix.Matrix(shape)

matrix base class

cond(constrain=None, lconstrain=None, rconstrain=None)

condition number

res(x, b=0, constrain=None, lconstrain=None, rconstrain=None, scaled=True)

residual

class nutils.matrix.ScipyMatrix(core)

matrix based on any of scipy’s sparse matrices

rowsupp(tol=0)

return row indices with nonzero/non-small entries

solve(rhs=None, constrain=None, lconstrain=None, rconstrain=None, tol=0, lhs0=None, solver=None, symmetric=False, callback=None, precon=None, **solverargs)

class nutils.matrix.NumpyMatrix(core)

matrix based on numpy array

solve(b=None, constrain=None, lconstrain=None, rconstrain=None, tol=0)

nutils.matrix.assemble(data, index, shape, force_dense=False)

create data from values and indices

nutils.matrix.parsecons(constrain, lconstrain, rconstrain, shape)

parse constraints