fortran - Filling Multidimensional Arrays -


i have created derived type access multi-dimensional arrays. each array associate name in array nm.

my problem consists how fill array values once have allocated memory.

an initial idea has been use multi-dimensional array input. might run memory problems if store 2 copies arrays can big. better idea might pass one-dimensional array data along first dimension , specification on position of second , third dimensions data should reside.

i value suggestions on possibly better ways fill arrays derived types if there people have experience working big data sets.

type :: multia    character (len=65) :: nm(3)   real, allocatable :: ma(:,:,:)    real, allocatable :: mb(:,:,:)    real, allocatable :: mc(:,:,:)     contains     procedure :: set  end type multia   subroutine set (m, nm, u, i, j)    class (multia), intent (inout) :: m   character (len=65) :: nm   real, intent (in) :: u(:)    integer, intent (in) :: i, j    if (nm .e. (m% nm(1)))     m% ma(:,i,j) = u   else if (nm .e. (m% nm(2)))     m% mb(:,i,j) = u   else if (nm .e. (m% nm(3)))     m% mc(:,i,j) = u   end if  end subroutine set

if concern duplication of arrays such in

m%ma = [...]  ! humongous array

then fortran 2003 offers move_alloc intrinsic moves allocation (including values) 1 variable another.

subroutine set (m, u, v, w)   class (multia), intent (inout) :: m   real, intent (inout), allocatable, dimension(:,:,:) :: u, v, w    call move_alloc(u, m%ma)   call move_alloc(v, m%mb)   call move_alloc(w, m%mc) end subroutine set

called like

type(multia) m real, dimension(:,:,:), allocatable :: u, v, w ! ... allocating , setting u, v, w call m%set(u, v, w) ! components of m allocated, u, v, w, not allocated

from notes (in fortran 2008) of intrinsic:

it expected implementation of allocatable objects typically involve descriptors locate allocated storage; move alloc implemented transferring contents of descriptor descriptor , clearing descriptor from.

that is, expectation there no copying of data or array temporaries.

this assumes, of course, can't allocate components of m , assign there directly.


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