MAXVAL

 MAXVAL (array [,dim] [,mask]

 Class:  Transformational function - Generic

 Returns the maximum value of all elements in an array, a set of
 elements in an array, or elements in a specified dimension of an
 array.

 The array can be of type integer or real.  The "dim" must be a
 scalar integer with a value in the range 1 to n, where "n" is the
 rank of "array".  The "mask" must be a logical array conformable
 with "array".

 The result is the same data type as "array".  The result is a
 logical array with the same kind type parameter as "array".  The
 result is a scalar if "dim" is absent or "array" has rank one.
 Otherwise, the result is an array with rank that is one less than
 "array", and shape (d1, d2,..., d"dim"-1, d"dim"+1,..., dn), where
 (d1, d2,..., dn) is the shape of "array".

 The result of MAXVAL (array) has a value equal to the maximum value
 of all the elements in "array".

 The result of MAXVAL (array, mask=mask) has a value equal to the
 maximum value of the elements in "array" corresponding to the
 condition specified by "mask".

 If "array" has size zero or if there are no true elements in
 "mask," the result has the value of the negative number of the
 largest magnitude supported by the processor for numbers of the
 type and kind type parameter of "array".

 Examples:

 The value of MAXVAL ((/2, 3, 4/)) is 4.

 The value of MAXVAL (B, MASK=B .LT.  0.0) finds the maximum of the
 negative elements of B.

 Consider that C is the array

  |2 3 4|
  |5 6 7|

 MAXVAL (C, DIM=1) has the value (5, 6, 7).

 MAXVAL (C, DIM=2) has the value (4, 7).