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42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
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*** BLAS/SRC/zrotg.f~ Mon Jul 3 19:23:21 1995
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--- BLAS/SRC/zrotg.f Tue Jul 4 13:11:24 1995
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***************
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*** 3,20 ****
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double precision c
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double precision norm,scale
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double complex alpha
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! if (cdabs(ca) .ne. 0.0d0) go to 10
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c = 0.0d0
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s = (1.0d0,0.0d0)
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ca = cb
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go to 20
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10 continue
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! scale = cdabs(ca) + cdabs(cb)
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! c = (cdabs(ca/dcmplx(scale,0.0d0)))**2 +
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! * (cdabs(cb/dcmplx(scale,0.0d0)))**2
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norm = scale*dsqrt(c)
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! alpha = ca /cdabs(ca)
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! c = cdabs(ca) / norm
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s = alpha * dconjg(cb) / norm
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ca = alpha * norm
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20 continue
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--- 3,20 ----
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double precision c
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double precision norm,scale
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double complex alpha
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! if (abs(ca) .ne. 0.0d0) go to 10
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c = 0.0d0
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s = (1.0d0,0.0d0)
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ca = cb
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go to 20
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10 continue
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! scale = abs(ca) + abs(cb)
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! c = (abs(ca/dcmplx(scale,0.0d0)))**2 +
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! * (abs(cb/dcmplx(scale,0.0d0)))**2
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norm = scale*dsqrt(c)
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! alpha = ca /abs(ca)
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! c = abs(ca) / norm
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s = alpha * dconjg(cb) / norm
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ca = alpha * norm
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20 continue
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