the transfer of two dimension array
in [Fortran]
|
From: Richard E Maine on 11 Oct 2006 14:43 dpb <dpbozarth(a)swko.net> wrote: > Elijah Cardon wrote: > > "FX" <coudert(a)alussinan.org> wrote in message > ... > > > program main > > > real ::array_name(12,4) = reshape((/ (real(i), i = 1, 48) /), & > > > (/ 12, 4 /)) > Interesting, what compiler? The problem is that the compiler didn't > recognize the use of real() in the argument to reshape() as an array, > but as the intrinsic function REAL() which isn't allowable in the > context as the error indicated. Huh? What alleged array named REAL is this suppose to be? I see no such thing anywhere. While it is allowed to have an array named REAL, I see no such thing in this code. It looks to me like the compiler is completely correct in identifying this as the intrinsic function REAL. The compiler is also correct in identifying this use as prohibitted by f95, although it is allowed in f2003 and would not be surprising as an extension in f95 compilers. > The workaround would be to use some other name for the temporary array > in the reshape() argument as in > > real ::array_name(12,4) = reshape((/ (r(i), i = 1, 48) /), & > (/ 12, 4 /)) > > where I used "r" instead of "real". And where is this alleged array r declared? One doesn't declare an array just by using it. This has nothing to do with implicit none. You can implicitly declare types, but there is no implicit declaration of arrayness. -- Richard Maine | Good judgment comes from experience; email: my first.last at org.domain| experience comes from bad judgment. org: nasa, domain: gov | -- Mark Twain
From: Steven G. Kargl on 11 Oct 2006 14:56 In article <1160590477.989518.251380(a)h48g2000cwc.googlegroups.com>, "dpb" <dpbozarth(a)swko.net> writes: > > Elijah Cardon wrote: >> "FX" <coudert(a)alussinan.org> wrote in message > ... >> > program main >> > real ::array_name(12,4) = reshape((/ (real(i), i = 1, 48) /), & >> > (/ 12, 4 /)) > ... > >> The snippet doesn't compile for me: >> Compiling file: array1.f95 >> C:\Documents and Settings\All Users\Documents\fortran_stuff\array1.F95(3) : >> error 921 - The REAL intrinsic function is not permitted in an >> initialisation expression >> Ideas? EC > > Interesting, what compiler? The problem is that the compiler didn't > recognize the use of real() in the argument to reshape() as an array, > but as the intrinsic function REAL() which isn't allowable in the > context as the error indicated. FX is using gfortran. REAL() is permitted in an initialization expression in Fortran 2003. See Section 7.1.7, item (4). By default gfortran enforces the F2003 rule. In Fortran 95, you are correct that REAL() isn't allowed. troutmask:sgk[204] gfortran -o z -std=f95 -pedantic f.f90 In file f.f90:2 real :: a(3) = (/ (real(i), i = 1, 3) /) 1 Error: Extension: Evaluation of nonstandard initialization expression at (1) troutmask:sgk[205] cat f.f90 program f real :: a(3) = (/ (real(i), i = 1, 3) /) print *, a end program f -- Steve http://troutmask.apl.washington.edu/~kargl/
From: dpb on 11 Oct 2006 16:18 Richard E Maine wrote: > dpb <dpbozarth(a)swko.net> wrote: > ... > Huh? What alleged array named REAL ... Mea culpa, _I_ misread the code... Guess I ought to retire permanently... :(
From: Richard E Maine on 11 Oct 2006 16:27 dpb <dpbozarth(a)swko.net> wrote: > Guess I ought to retire permanently... :( Join the club. (I embarasssed myself by an egregious misstatement in a post about a week ago. Yes, I posted a correction, but it was still embarassing.) :-( And I become eligible in about a week and a half. :-) -- Richard Maine | Good judgment comes from experience; email: my first.last at org.domain| experience comes from bad judgment. org: nasa, domain: gov | -- Mark Twain
From: Elijah Cardon on 12 Oct 2006 21:06
"Richard E Maine" <nospam(a)see.signature> wrote in message news:1hn1p8r.1s0le4u9vmrf4N%nospam(a)see.signature... > dpb <dpbozarth(a)swko.net> wrote: > >> Guess I ought to retire permanently... :( > > Join the club. (I embarasssed myself by an egregious misstatement in a > post about a week ago. Yes, I posted a correction, but it was still > embarassing.) :-( > > And I become eligible in about a week and a half. :-) Mistakes by veteran fortran programmers just make the rest of us feel better. I use silverfrost's ide that they give away, but I was pretty sure that it wasn't a problem limited to me because I took it to the Lahey source checker and got: Source file : SOURCE.F90 Main program "main" (line-no.)(nest) 1 program main 2 real ::array_name(12,4) = reshape((/ (real(i), i = 1, 48) /), & 3 (/ 12, 4 /)) 4 print *, array_name 5 call xx(array_name) 6 end Diagnostic messages: program name(main) 0531-S: "SOURCE.F90", line 2: Invalid initialization expression. 1143-S: "SOURCE.F90", line 2, column 31: Missing constant expression. Procedure information Lines : 6 Statements : 5 Scoping unit of program : main Attribute and Cross reference of name array_name |(Class and Type) : variable name, REAL(4) |(Attributes) : DIMENSION |(Declaration) : 2 |(Definition) : 5 |(Reference) : 4 main |(Class and Type) : program name |(Attributes) : |(Declaration) : 1 |(Definition) : |(Reference) : xx |(Class and Type) : external subroutine name |(Attributes) : |(Declaration) : |(Definition) : |(Reference) : 5 External subroutine subprogram "xx" (line-no.)(nest) 7 8 subroutine xx(arrayname) 9 real::arrayname(12,4) 10 print *, arrayname 11 endsubroutine Procedure information Lines : 5 Statements : 4 Scoping unit of external sub-program : xx Attribute and Cross reference of name arrayname |(Class and Type) : variable name, REAL(4) |(Attributes) : DIMENSION, dummy-argument |(Declaration) : 8 9 |(Definition) : |(Reference) : 10 xx |(Class and Type) : external subroutine name |(Attributes) : |(Declaration) : |(Definition) : 8 |(Reference) : Total information Procedures : 2 Total lines : 11 Total statements : 9 What a nice resource that is. EC |