MERGE - The GNU Fortran Compiler
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### 8.171 `MERGE` — Merge variables

Description:
  Select values from two arrays according to a logical mask. The result is equal to TSOURCE if MASK is `.TRUE.`, or equal to FSOURCE if it is `.FALSE.`.
Standard:
  Fortran 95 and later
Class:
  Elemental function
Syntax:
  `RESULT = MERGE(TSOURCE, FSOURCE, MASK)`
Arguments:

  TSOURCE | May be of any type.
  FSOURCE | Shall be of the same type and type parameters as TSOURCE.
  MASK | Shall be of type `LOGICAL`.

Return value:
  The result is of the same type and type parameters as TSOURCE.