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Declaring matrix dimensions from an input file

Declaring matrix dimensions from an input file

(OP)
Assuming that in a subroutine we use a matrix named as VOL(IDI,IDI).
Instead of declaring IDI in PARAMETER command, i.e: PARAMETER (IDI=10), is it possible to declare it at the input file, so the matrix dimensions whould change depending on the input file?

RE: Declaring matrix dimensions from an input file

Depends on which version of Fortran you are using. F77 no, F90 onwards yes.

CODE

real, dimension(:,:), allocatable:: vol
    integer:: idi, status
    ...
    ! to get the value of idi
    read(channel, *) idi
    ! to allocate the space
    allocate(vol(idi,idi))
    ...
    ! when you've finished with it
    deallocate(vol, stat = status) 

RE: Declaring matrix dimensions from an input file

(OP)
That was really helpful!!!!2thumbsup
Thanks xwb :)

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