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73 lines
1.7 KiB
73 lines
1.7 KiB
/* slapy2.f -- translated by f2c (version 20061008). |
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You must link the resulting object file with libf2c: |
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on Microsoft Windows system, link with libf2c.lib; |
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm |
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or, if you install libf2c.a in a standard place, with -lf2c -lm |
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-- in that order, at the end of the command line, as in |
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cc *.o -lf2c -lm |
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., |
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http://www.netlib.org/f2c/libf2c.zip |
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*/ |
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#include "clapack.h" |
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doublereal slapy2_(real *x, real *y) |
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{ |
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/* System generated locals */ |
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real ret_val, r__1; |
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/* Builtin functions */ |
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double sqrt(doublereal); |
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/* Local variables */ |
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real w, z__, xabs, yabs; |
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/* -- LAPACK auxiliary routine (version 3.2) -- */ |
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ |
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/* November 2006 */ |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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/* SLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary */ |
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/* overflow. */ |
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/* Arguments */ |
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/* ========= */ |
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/* X (input) REAL */ |
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/* Y (input) REAL */ |
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/* X and Y specify the values x and y. */ |
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/* ===================================================================== */ |
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/* .. Parameters .. */ |
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/* .. */ |
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/* .. Local Scalars .. */ |
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/* .. */ |
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/* .. Intrinsic Functions .. */ |
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/* .. */ |
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/* .. Executable Statements .. */ |
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xabs = dabs(*x); |
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yabs = dabs(*y); |
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w = dmax(xabs,yabs); |
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z__ = dmin(xabs,yabs); |
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if (z__ == 0.f) { |
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ret_val = w; |
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} else { |
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/* Computing 2nd power */ |
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r__1 = z__ / w; |
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ret_val = w * sqrt(r__1 * r__1 + 1.f); |
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} |
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return ret_val; |
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/* End of SLAPY2 */ |
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} /* slapy2_ */
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