Increasing Size of FORTRAN Array without Reallocation

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SUMMARY

In FORTRAN, it is not possible to directly increase the size of an already allocated array without reallocation. The common approach involves creating a temporary array to hold the existing values, deallocating the original array, and then allocating a new array with the desired size. For example, to expand an array from size 3 to size 4, one would allocate a temporary array, copy the values, deallocate the original, and then allocate the new array with the additional element. This method ensures data integrity while resizing the array.

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  • Basic concepts of dynamic memory allocation
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This discussion is beneficial for FORTRAN programmers, software developers working with numerical computing, and anyone involved in memory management and optimization in FORTRAN applications.

Zahur
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Is it possible to increase the size of an already allocated array in FORTRAN, without reallocation?
e.g. if in start A(3)=[4, 5, 6] and now I want something like A(4)=[4, 5, 6, 7].
Currently I am using a temporary array to do this

allocate(A(3))
A=(/4, 5, 6/)
allocate(temp(3))
temp=A
deallocate(A)
allocate(A(4))
A(1:3)=temp
A(4)=7


Or some other suggestion

Zahur
 
Technology news on Phys.org
I'm not a Fortran programmer, but some googling lead me to this. NB: I've not read the code, or tested it.
 

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