Array Sections

An array can be subscripted by a subscript-triplet (a shorthand notation for a linear function) which will give rise to a sub-array of the original. The general form is:

 
[   bound1   ]:[   bound2   ][:   stride   ]

the section starts at  bound1 and ends at or before  bound2 .  stride is the increment by which the locations are selected.

 bound1 ,  bound2 and  stride must all be scalar integer expressions. Thus

   A(m:m) = 0     ! m to m 1 elt array
   A(m:n:k) = 0   ! m to n step k
   A(8:3:-1) = 0  ! 8 to 3 backwards
   A(8:3) = 2     ! step 1 => Zero size
   A(M::4) = 1    ! default UPB, step 4
   A(::2) = 1.0   ! default LWB and UPB
   A(m**2:n*k/3) = 1.0

are all valid.

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