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Memory Allocation issues in FORTRAN 90

  1. Jun 14, 2013 #1
    I'm having trouble allocating memory for a dynamic two dimensional array in FORTRAN 90; the odd thing is that when I did the same thing using three on dimensional arrays instead of an array with the dimensions 3*x, I didn't have a problem.

    read (1,*) ndat1 !The first line of every file is the number of
    read (2,*) ndat2 !rows of data.

    allocate (input1(3,ndat1), STAT=AllocateStatus) !Allocating memory for input arrays.
    if (AllocateStatus /= 0) STOP "first ***Not enough memory"
    allocate (input1(3,ndat2), STAT=AllocateStatus)
    if (AllocateStatus /= 0) STOP "***second Not enough memory"

    When I run it, I get to 'second Non enough memory', and when I print out an error statement, I get 5014. Does anyone know what is going on? Thanks.
  2. jcsd
  3. Jun 14, 2013 #2


    Staff: Mentor

    It looks to me like you are trying to allocate memory for the same array -- input1 -- twice. Why aren't you using a different array for the 2nd call to allocate?
  4. Jun 14, 2013 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Why does your READ statement refer to two different I/O units?
  5. Jun 14, 2013 #4
    Sorry, I was being dumb; I just didn't catch that typo. Thanks very much; it works now. I changed input1 to input2. I am reading from two separate files, and then building an array for each file, which is why I needed to I/O units. Thanks again!
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