Array Terminology

Real, Dimension(15) :: X 

Real, Dimension(1:5,1:3) :: Y, Z

The above are explicit-shape arrays.

Terminology:

• Rank Number of dimensions.

  Rank of X is 1; rank of Y and Z is 2.

• Bounds Upper and lower limits of indices.

  Bounds of X are 1 and 15; Bound of Y and Z are 1 and 5 and 1 and 3.

  If the lower bound is not explicitly stated it is taken to be 1.

• Extent - number of elements in dimension;

  Extent of X is 15; extents of Y and Z are 5 and 3.

• Size - total number of elements.

  Size of X, Y and Z is 15.

• Shape - rank and extents;

  Shape of X is 15; shape of Y and Z is 5,3.

• Conformable - same shape.

  Y and Z are conformable.