Solves A X = B for a vector `X,' where A is specified by the mxn array U, `n' vector W, and nxn matrix V as returned by svdcmp. `m' and `n' are the dimensions of `A,' and will be equal for square matrices. `B' is the 1xm input vector for the right-hand side. `X' is the 1xn output solution vector. All arrays are of single-floats. No input quantities are destroyed, so the routine may be called sequentially with different B's. See the discussion in Numerical Recipes in C, section 2.6. This routine assumes that near zero singular values have already been zeroed. It returns no values, storing the result in `X.' It does use some auxiliary storage, which can be passed in as `tmp,' a single-float array of length `n,' if you want to avoid consing.