Fortran Can You Use Nested Subroutines in Fortran95 and How Do You Link Them?

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In Fortran 95, subroutines cannot be nested within other subroutines. However, it is possible to return arrays from subroutines. To link subroutines in the main program, the INTERFACE-END INTERFACE construction is necessary. The discussion centers around a program designed to solve linear equations using methods like Gauss-Seidel iteration and Gauss-Jordan elimination. The user seeks to rearrange rows within the Gauss-Seidel subroutine to achieve a diagonally dominant matrix and needs to pass this modified matrix back to the subroutine for further processing.
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basic question really...can you have subroutines nested within subroutines? or are there any other types of subprograms within fortran95 other than functions and subroutines? (need one that can pass back an array)

if you can [use subs within subs], how do you link them? like in the main program you have to use an INTERFACE-END INTERFACE construction to link to the subroutine...

ta in advance
 
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Not sure about subroutines within a subroutine, gut feeling is that it won't work. As for returning an array, that is possible.
 
erm...could you elaborate? I'm writing a program that solves linear equations with gauss seidel iteration (and gauss/gauss jordan elimination), so there's a main program which calls the various methods as subroutines...

except within the gauss seidel subroutine I want to separate a bit which makes the matrix diagonally dominant(ish)...obviously after rearranging the rows the matrix needs to be passed back to the gauss seidel subroutine.
 

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