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---
:name: zlacrt
:md5sum: 604f79f577cce40b1cf8d8abaa65ee99
:category: :subroutine
:arguments:
- n:
:type: integer
:intent: input
- cx:
:type: doublecomplex
:intent: input/output
:dims:
- n
- incx:
:type: integer
:intent: input
- cy:
:type: doublecomplex
:intent: input/output
:dims:
- n
- incy:
:type: integer
:intent: input
- c:
:type: doublecomplex
:intent: input
- s:
:type: doublecomplex
:intent: input
:substitutions: {}
:fortran_help: " SUBROUTINE ZLACRT( N, CX, INCX, CY, INCY, C, S )\n\n\
* Purpose\n\
* =======\n\
*\n\
* ZLACRT performs the operation\n\
*\n\
* ( c s )( x ) ==> ( x )\n\
* ( -s c )( y ) ( y )\n\
*\n\
* where c and s are complex and the vectors x and y are complex.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* N (input) INTEGER\n\
* The number of elements in the vectors CX and CY.\n\
*\n\
* CX (input/output) COMPLEX*16 array, dimension (N)\n\
* On input, the vector x.\n\
* On output, CX is overwritten with c*x + s*y.\n\
*\n\
* INCX (input) INTEGER\n\
* The increment between successive values of CX. INCX <> 0.\n\
*\n\
* CY (input/output) COMPLEX*16 array, dimension (N)\n\
* On input, the vector y.\n\
* On output, CY is overwritten with -s*x + c*y.\n\
*\n\
* INCY (input) INTEGER\n\
* The increment between successive values of CY. INCY <> 0.\n\
*\n\
* C (input) COMPLEX*16\n\
* S (input) COMPLEX*16\n\
* C and S define the matrix\n\
* [ C S ].\n\
* [ -S C ]\n\
*\n\n\
* =====================================================================\n\
*\n\
* .. Local Scalars ..\n INTEGER I, IX, IY\n COMPLEX*16 CTEMP\n\
* ..\n"
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