Commit a6057201 authored by Gregor Michalicek's avatar Gregor Michalicek

Changes from Gustav to math/cfft.F

An error occured because an FFT mesh size had too large prime factors.
This lead to too small array sizes in math/cfft.F. Gustav had a
version of this routine in which this error was already fixed. I
pasted his changes to math/cfft.F.
parent 72499f04
......@@ -46,7 +46,7 @@ c are used for temporary storage. if the available storage
c is insufficient, the program is terminated by a stop.
c maxf must be .ge. the maximum prime factor of n.
c maxp must be .gt. the number of prime factors of n.
c in addition, if the square-free portion k cf n has two or
c in addition, if the square-free portion k of n has two or
c more prime factors, then maxp must be .ge. k-1.
c array storage in nfac for a maximum of 11 factors of n.
c if n has more than one square-free factor, the product of the
......@@ -76,16 +76,16 @@ C .. Local Arrays ..
INTEGER, ALLOCATABLE :: nfac(:),np(:)
C ..
C .. Intrinsic Functions ..
INTRINSIC cos,real,mod,sin
INTRINSIC cos,real,mod,sin,sqrt
C ..
C .. Equivalences ..
C ..
maxf = 299
maxp = 503
maxnf = 17
maxf = MAX(299,n)
maxp = MAX(503,n-1)
maxnf = MAX(17,CEILING(sqrt(1.0*n)))
ALLOCATE ( at(maxf),bt(maxf),ck(maxf),sk(maxf) )
ALLOCATE ( nfac(maxnf),np(maxp) )
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