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subroutine zswap (n,zx,incx,zy,incy)
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c interchanges two vectors.
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c jack dongarra, 3/11/78.
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c modified 12/3/93, array(1) declarations changed to array(*)
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double complex zx(*),zy(*),ztemp
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integer i,incx,incy,ix,iy,n
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if(incx.eq.1.and.incy.eq.1)go to 20
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c code for unequal increments or equal increments not equal
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if(incx.lt.0)ix = (-n+1)*incx + 1
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if(incy.lt.0)iy = (-n+1)*incy + 1
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c code for both increments equal to 1