stp_cmplx.dir@stp_cmplx.h.dir@STP_Cmplx_abs

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  Function: STP_Cmplx_abs

  Summary:  Gets magnitude |z| of cmplx.

  Args:     STP_Cmplx* cmplx
              .
            STP_Number* out
              output number. If NULL, outputs to cmplx->real.
            int64_t wp
              decimal digits to be correct to.

  Returns:  int
              1 if successful, 0 if not.

  Requires: * cmplx is initialized and non-NULL.
            * wp > 10. If not, 10 is used.

  Note:     1. if out is NULL, writes result to cmplx->real.
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