docstr: Solve a * x = b  where a and b are matrices.
docstr_tok: ["Solve","a","*","x","=","b","where","a","and","b","are","matrices","."]
code: def lu_solve_mat(ctx, a, b):
      """Solve a * x = b  where a and b are matrices."""
      r = ctx.matrix(a.rows, b.cols)
      for i in range(b.cols):
          c = ctx.lu_solve(a, b.column(i))
          for j in range(len(c)):
              r[j, i] = c[j]
      return r
  
imports: from copy import copy
  from ..libmp.backend import xrange
label_desc: Use image node_id 16 for calling the LinearAlgebraMethods obj's underlying member method code with example usage: obj.lu_solve_mat(ctx, a, b) and returns: r