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### 9.220 `PRODUCT`

— Product of array elements

*Description*:Multiplies the elements of

`ARRAY`along dimension`DIM`if the corresponding element in`MASK`is`TRUE`

.*Standard*:Fortran 90 and later

*Class*:Transformational function

*Syntax*:`RESULT = PRODUCT(ARRAY[, MASK])`

`RESULT = PRODUCT(ARRAY, DIM[, MASK])`

*Arguments*:`ARRAY`Shall be an array of type `INTEGER`

,`REAL`

or`COMPLEX`

.`DIM`(Optional) shall be a scalar of type `INTEGER`

with a value in the range from 1 to n, where n equals the rank of`ARRAY`.`MASK`(Optional) shall be of type `LOGICAL`

and either be a scalar or an array of the same shape as`ARRAY`.*Return value*:The result is of the same type as

`ARRAY`.If

`DIM`is absent, a scalar with the product of all elements in`ARRAY`is returned. Otherwise, an array of rank n-1, where n equals the rank of`ARRAY`, and a shape similar to that of`ARRAY`with dimension`DIM`dropped is returned.*Example*:PROGRAM test_product INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /) print *, PRODUCT(x) ! all elements, product = 120 print *, PRODUCT(x, MASK=MOD(x, 2)==1) ! odd elements, product = 15 END PROGRAM

*See also*: