gfortran

问题 There are many responses on other posts related to the issue of stack space, OpenMP, and how to deal with it. However, I could not find information to truly understand why OpenMP adjusts the compiler options: What is the reasoning behind why -fopenmp in gfortran implies -frecursive ? The documentation says: Allow indirect recursion by forcing all local arrays to be allocated on the stack However, I don't have the context to understand this. Why would parallelization require indirect recursion

问题 I'd like to realize useful array operations (add element, remove element, different realizations by allocatable/pointer/binary tree structures) by class(*) feature (unlimited polymorphism). I use gfortran 5.0 that should handle such a feature. I need it for not repeating identical code for each type I use. This should look something like function add_element(array,element) class(*),intent(in)::array(:) class(*),intent(in)::element class(*)::add_element(size(array)+1) add_element=[array

问题 I am testing FFTW in a fortran program, because I need to use it. Since I am working with huge matrixes, my first solution is to use OpenMP. When my matrix has dimension 500 x 500 x 500 , the following error happens: Operating system error: Program aborted. Backtrace: Cannot allocate memory Allocation would exceed memory limit I compiled the code using the following: gfortran -o test teste_fftw_openmp.f90 -I/usr/local/include -L/usr/lib/x86_64-linux-gnu -lfftw3_omp -lfftw3 -lm -fopenmp

问题 This is how I have compiled a fortran 77 file with gfortran 4.8.5 gfortran -Wall -O0 -c -g -fbacktrace -ffpe-trap=invalid,denormal,zero,overflow,underflow ${tool}.f ${ncdf_incs} and then I run it and I get this floating point exception Program received signal SIGFPE: Floating-point exception - erroneous arithmetic operation. Backtrace for this error: #0 0x7F9AC3077E08 #1 0x7F9AC3076F90 #2 0x7F9AC29BE4AF #3 0x404894 in psiappsor at inv_cart.f:1221 #4 0x40F7E8 in MAIN__ at inv_cart.f:159

问题 So I've written a basic Vigenere Cypher in Fortran 90, however when I try to compile it, I am hammered with Unclassifiable Statement Errors due to my internal SUBROUTINES. I have listed the variables used in each SUBROUTINE in '(' ')', but I am still getting back errors. I think it's a really simple fix, but I can't seem to find a solution to it. Here is my code: PROGRAM Assign_8 IMPLICIT NONE CHARACTER*750 :: Input CHARACTER*10 :: Key CHARACTER*750 :: RepeatedKey CHARACTER*750 :: Encrypted,

问题 I installed gfortran 90 when I wanted gfortran 77, which is causing errors in configuring mpich, so as such I wanted to uninstall gfortran 90 from my computer, but deleting gfortran from usr/local/bin didn't really do anything. When I do gfortran -v I get an answer, when I want something like bash: command not found. How can I do that? 回答1: From : http://www.webmo.net/support/fortran_osx.html Thus, to uninstall the package, run $ sudo rm -r /usr/local/gfortran /usr/local/bin/gfortran Edit:

问题 I've been trying lately to use libraries in Fotran, but I kept on getting this error message Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status which I cound't find any specific solution to it. In this case, I was working with some libraries that I built myself (this problem happened with static and shared libraries) from simples modules I wrote

问题 I'm trying to process a spatial dataset which is stored as a regular X, Y and Z coordinate grid with each location having multiple fields storing the attributes. However, when allocating the array to store the data, it throws an error. Currently working with gcc gfortran version 8.1.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project) on Win10. I've tried different machines (in case I'm hitting hardware limits) and looked at various compiler options, but have no managed to affect the result.

问题 I am working on Windows 10 64-bit using MSYS2 with the 64-bit toolchain. In the MSYS2 terminal I found and installed the following packages after searching for them with pacman -Ss , mingw64/mingw-w64-x86_64-openblas 0.2.20-2 mingw64/mingw-w64-x86_64-lapack 3.6.1-1 mingw64/mingw-w64-x86_64-arpack 3.5.0-1 I took an example fortran source file from the Intel MKL library examples; I copied the dgelsx.f file to a folder in my msys home directory. I compile (in the mingw64 terminal) with gfortran

问题 I have a problem with compiling a fortran program with the gfortan complier. The main program is located in main.f. So, I write in console: gfortran D:\test\test.f But it displays me a lot of errors such as: C:\Users\Efds~1\AppData\Local\Temp\cchFNGgc.o:test.f:<.test+0x3a>: undefined reference to '_gridw_' C:\Users\Efds~1\AppData\Local\Temp\cchFNGgc.o:test.f:<.test+0x3a>: undefined reference to '_gridz_' etc. I think it's because of functions gridw , gridz etc. are located in other *.f files.