LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ clacsg()

subroutine clacsg ( integer  M,
integer  P,
integer  Q,
real, dimension( * )  THETA,
integer, dimension( 4 )  ISEED,
complex, dimension( ldx, * )  X,
integer  LDX,
complex, dimension( * )  WORK 
)

Definition at line 352 of file cckcsd.f.

353 IMPLICIT NONE
354*
355 INTEGER LDX, M, P, Q
356 INTEGER ISEED( 4 )
357 REAL THETA( * )
358 COMPLEX WORK( * ), X( LDX, * )
359*
360 COMPLEX ONE, ZERO
361 parameter( one = (1.0e0,0.0e0), zero = (0.0e0,0.0e0) )
362*
363 INTEGER I, INFO, R
364*
365 r = min( p, m-p, q, m-q )
366*
367 CALL claset( 'Full', m, m, zero, zero, x, ldx )
368*
369 DO i = 1, min(p,q)-r
370 x(i,i) = one
371 END DO
372 DO i = 1, r
373 x(min(p,q)-r+i,min(p,q)-r+i) = cmplx( cos(theta(i)), 0.0e0 )
374 END DO
375 DO i = 1, min(p,m-q)-r
376 x(p-i+1,m-i+1) = -one
377 END DO
378 DO i = 1, r
379 x(p-(min(p,m-q)-r)+1-i,m-(min(p,m-q)-r)+1-i) =
380 $ cmplx( -sin(theta(r-i+1)), 0.0e0 )
381 END DO
382 DO i = 1, min(m-p,q)-r
383 x(m-i+1,q-i+1) = one
384 END DO
385 DO i = 1, r
386 x(m-(min(m-p,q)-r)+1-i,q-(min(m-p,q)-r)+1-i) =
387 $ cmplx( sin(theta(r-i+1)), 0.0e0 )
388 END DO
389 DO i = 1, min(m-p,m-q)-r
390 x(p+i,q+i) = one
391 END DO
392 DO i = 1, r
393 x(p+(min(m-p,m-q)-r)+i,q+(min(m-p,m-q)-r)+i) =
394 $ cmplx( cos(theta(i)), 0.0e0 )
395 END DO
396 CALL claror( 'Left', 'No init', p, m, x, ldx, iseed, work, info )
397 CALL claror( 'Left', 'No init', m-p, m, x(p+1,1), ldx,
398 $ iseed, work, info )
399 CALL claror( 'Right', 'No init', m, q, x, ldx, iseed,
400 $ work, info )
401 CALL claror( 'Right', 'No init', m, m-q,
402 $ x(1,q+1), ldx, iseed, work, info )
403*
subroutine claror(SIDE, INIT, M, N, A, LDA, ISEED, X, INFO)
CLAROR
Definition: claror.f:158
subroutine claset(UPLO, M, N, ALPHA, BETA, A, LDA)
CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Definition: claset.f:106
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