fortran | 易学教程

Escape sequence in a string literal (Fortran)

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问题 There is an example in C++ string str; str = "First\n" "Second\n" "Third;\n"; cout << str << endl; The output will be First Second Third; I wanna try to repeat it in Fortran and didn't find any info about escape-sequence in char string like in C++. 回答1: One way would be to use achar with the ASCII code for linefeed , that is 10 . The advantage of this method is, you can use other characters as necessary if you know the ASCII code. character(len=32):: str = "First" // achar(10) // "Second"

Assigning variable number to complex array

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问题 I want to assign complex array as variable. My code is like complex indx(3,3) integer i,j do i=1,3 do j=1,3 indx(i,j) = (i,j) write(*,*) indx(i,j) end do end do and in this case I am getting an error like A symbol must be a defined parameter in this context. [I] indx(i,j) = (i,j) 回答1: You must use function cmplx to build a complex value you want to assign. complex indx(3,3) integer i,j do i=1,3 do j=1,3 indx(i,j) = cmplx(i,j) write(*,*) indx(i,j) end do end do The syntax you tried is only

GFortran error: ld: library not found for -lSystem when trying to compile

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问题 I am getting a strange error when trying to compile a simple fortran-90 file using gfortran. I am working on a macOS mojave system. I have gfortran 8.2.0 installed and I checked to be sure of this by doing the following: Input: gfortran --version Output: GNU Fortran (GCC) 8.2.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Which indicates

GFortran error: ld: library not found for -lSystem when trying to compile

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Huge fort.# files when running gfortran

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问题 I am using gfortran for an application and running the Fortran through a Matlab mex file. I have noticed that in the current directory when I run the Fortran file, on my mac, it creates a fort.9 or fort.16 file, where the 9 or 16 are some arbitrary number. Recently, I have noticed that these fort. files can be GBs big! Generally they are quite small, like a few kBs. I was just wondering what purpose these files have? And second, is there some error I have in my code that is causing them to be

Huge fort.# files when running gfortran

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Incorrect fortran errors: allocatable array is already allocated; DEALLOCATE points to an array that cannot be deallocated

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问题 I have written a fortran code which is failing in a way that I do not understand. I have tried to explain the scenario clearly below but please ask me to clarify if it is not clear. The code includes a subroutine SUBROUTINE TMGP(NSYM,NOB,NFT,DEN,ncod,PR,np,lden,NPMX,nuccen,mdel) IMPLICIT NONE ... INTEGER :: NINTS REAL(KIND=wp), ALLOCATABLE :: XBUF(:) ... print *,"xbuf allocated ?",allocated(xbuf) print *,"xbuf not allocated ?",.not.allocated(xbuf) if (allocated(xbuf)) then DEALLOCATE(xbuf)

气象招聘 | 数鹏通（LinkCM）科技招聘气象算法工程师

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OMP: What is the difference between OMP PARALLEL DO and OMP DO (Without parallel directive at all)

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问题 OK, I hope this was not asked before, because this is a little tricky to find on the search. I have looked over the F95 manual, but still find this vague: For the simple case of: DO i=0,99 <some functionality> END DO I'm trying to figure out what is the difference between: !$OMP DO PRIVATE(i) DO i=0,99 <some functionality> END DO !$OMP END DO And: !$OMP PARALLEL DO PRIVATE(i) DO i=0,99 <some functionality> END DO !$OMP PARALLEL END DO (Just to point out the difference: the first one has OMP

OMP: What is the difference between OMP PARALLEL DO and OMP DO (Without parallel directive at all)

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