BLACS -- Combine Operations

Global combine operations

• Perform element-wise SUM, |MAX|, |MIN|, operations on triangular matrices

  • _GSUM2D(ICTXT, SCOPE, TOP, M, N, A, LDA, RDEST, CDEST)
  • _GAMX2D(ICTXT, SCOPE, TOP, M, N, A, LDA, RA, CA, RCFLAG,
    RDEST, CDEST)
  • _GAMN2D(ICTXT, SCOPE, TOP, M, N, A, LDA, RA, CA, RCFLAG,
    RDEST, CDEST)

• RDEST = -1 indicates that the result of the operation should be left on all processes selected by SCOPE,

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