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dcnvcor2 (3)
  • >> dcnvcor2 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dcnvcor2 - compute the convolution or  correlation  of  real
         matrices
    
         SUBROUTINE  DCNVCOR2  (CNVCOR,  METHOD,  TRANSX,   SCRATCHX,
                   TRANSY,  SCRATCHY,  MX,  NX, X, LDX, MY, NY, MPRE,
                   NPRE, Y, LDY, MZ, NZ, Z, LDZ, WORK, LWORK)
    
         CHARACTER CNVCOR, METHOD, SCRATCHX, SCRATCHY, TRANSX, TRANSY
    
         INTEGER LDX, LDY, LDZ, LWORK, MPRE, MX, MY,  MZ,  NPRE,  NX,
                   NY, NZ
    
         DOUBLE PRECISION WORK(*), X(*), Y(*), Z(*)
    
    
    
         #include <sunperf.h>
    
         void dcnvcor2(char cnvcor, char method,  char  transx,  char
                   scratchx,  char transy, char scratchy, int mx, int
                   nx, double *x, int ldx, int my, int ny, int  mpre,
                   int npre, double *y, int ldy, int mz, int nz, dou-
                   ble  *z,  int  ldz,  doublecomplex  *workin,   int
                   lwork);
    
    PURPOSE
         DCNVCOR computes the  convolution  or  correlation  of  real
         matrices.
    
    ARGUMENTS
         CNVCOR    (input) CHARACTER
                   'V' or 'v' to compute convolution, 'R' or  'r'  to
                   compute correlation.
    
         METHOD    (input) CHARACTER
                   'T' or 't' if the Fourier transform method  is  to
                   be  used,  'D' or 'd' to compute directly from the
                   definition.
    
         TRANSX    (input) CHARACTER
                   'N' or 'n' if X is the filter matrix, 'T'  or  't'
                   if transpose(X) is the filter matrix.
    
         SCRATCHX  (input) CHARACTER
                   'N' or 'n' if X must be preserved, 'S' or 's' if X
                   can  be  used as scratch space.  The contents of X
                   are undefined after returning from a call in which
                   X is allowed to be used for scratch.
    
         TRANSY    (input) CHARACTER
                   'N' or 'n' if Y is the input matrix, 'T' or 't' if
                   transpose(Y) is the filter matrix.
    
         SCRATCHY  (input) CHARACTER
                   'N' or 'n' if Y must be preserved, 'S' or 's' if Y
                   can  be  used as scratch space.  The contents of Y
                   are undefined after returning from a call in which
                   Y is allowed to be used for scratch.
    
         MX        (input) INTEGER
                   Number of rows in the filter matrix.  MX >= 0.
    
         NX        (input) INTEGER
                   Number of columns in the filter matrix.  NX >= 0.
    
         X         (input/output) DOUBLE PRECISION(LDX,NX)
                   On entry, the filter matrix.  Unchanged on exit if
                   SCRATCHX  is  'N'  or  'n',  undefined  on exit if
                   SCRATCHX is 'S' or 's'.
    
         LDX       (input) INTEGER
                   Leading dimension of the array that  contains  the
                   filter matrix.
    
         MY        (input) INTEGER
                   Number of rows in the input matrix.  MY >= 0.
    
         NY        (input) INTEGER
                   Number of columns in the input matrix.  NY >= 0.
    
         MPRE      (input) INTEGER
                   Number of implicit zeros to prepend to each row of
                   the input matrix.  MPRE >= 0.
    
         NPRE      (input) INTEGER
                   Number of implicit zeros to prepend to each column
                   of the input matrix.  NPRE >= 0.
    
         Y         (input/output) DOUBLE PRECISION(LDY,*)
                   Input matrix.  Unchanged on exit  if  SCRATCHY  is
                   'N'  or  'n', undefined on exit if SCRATCHY is 'S'
                   or 's'.
    
         LDY       (input) INTEGER
                   Leading dimension of the array that  contains  the
                   input matrix.
    
         NZ        (input) INTEGER
                   Length of the output vectors.  NZ >=  0.   DCNVCOR
                   will return immediately if NZ = 0.
    
         Z         (output) DOUBLE PRECISION(LDZ,*)
                   Result vectors.
    
         WORK      (input/scratch) DOUBLE PRECISION(LWORK)
                   On entry for the first call to  DCNVCOR2,  WORK(1)
                   must  contain  CMPLX(0.0,0.0).   After  the  first
                   call, WORK(1) must be set  to  CMPLX(0.0,0.0)  iff
                   WORK  has been altered since the last call to this
                   subroutine.
    
         LWORK     (input) INTEGER
                   Length of the work vector.  If the FFT  is  to  be
                   used  then for best performance LWORK should be at
                   least 30 words longer than the  amount  of  memory
                   needed to hold the trig tables.  If the FFT is not
                   used, the value of LWORK is unimportant.
    
    
    
    


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