Recent questions tagged Fortran

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fortran - Function call stopping/hanging when containing a write-statement, but only when linking with certain libraries during compilation

Here is my minimal example: program test implicit none real :: testfunc write(*,*) "Writing from main" write(*, ... just stop linking to them.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Calling an internal subroutine inside OpenMP region

I have a module that contains a subroutine that contains another subroutine. The outer subroutine has a parallel ... to its child subroutines. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Sourced allocation of a non-contiguous array section

In relation to a recent post regarding how to declare the array shape concisely, I tried the following three ... = (garbage data, reasonable) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Cannot detect file existing or not

In a program I am improving, I noticed that Fortran does not detect file existing or not. This led to a ... Dump file not found' stop endif See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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730 views

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fortran - Fibonacci numbers becoming negative after a certain term

I wrote this program in Fortran to display the Fibonacci numbers up to the x-th term: program fibonacci ... m using the gfortran compiler. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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879 views

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fortran - Syntax for openmp long directive list fortran77

PROBLEM : Long list of directives openmp fortran77 c$omp parallel default(shared) private(i,k,i1,i2,i3,i4,i5, ... because I am using fortran77) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Number of lines of a text file

I'm trying to make a function that takes in a file name (i.e. "data.txt") and produces the number of ... when I compile just the wrong output. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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597 views

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fortran - "DATA INT / 'STRING' /" problem when compiling with gfortran

I have some old (~1995) legacy fortran code which is compiled with g77 compiler and fails on gfortran. The ... this? Thank you in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Proper way of doing the systematic computations / initializations at the beginning of a program

I am writing a program that I will use in two main cases: 1D and 2D. The dimension ndim is loaded through ... what would be the proper syntax? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - sum only on certain dimension

I have a Fortran 90array (matrix) like: REAL(8),DIMENSION(Xmax, Ymax, Zmax, Xmax, Ymax, Zmax) :: Mat ... function? what would be more efficient? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Meaning of filelocation = "../"//filename

filelocation = "../"//filename PRINT *, "Attempting to open ", TRIM(filename) OPEN(fh1, FILE = filelocation, STATUS= ... /"// in the first line? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Characters in quotes in a print statement

The documentation for the datetime subroutine in fortran-95, gives an example on the usage of data and time. Here ... , in the print statements? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Scoping rules for variable and functions in contained subroutines

I have a problem understanding why a variable (i) declared in a subroutine is seen in a contained subroutine, ... right words). Any explanation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Segfault when calling a function with a constant argument

I have written this very simple code in Fortran: program su implicit none real ran3 write(*,*) ran3(0) end program ... and how I can solve it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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674 views

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fortran - How can I make gfortran or ifort tell me when it implicitly promotes a REAL(4) to a REAL(8)?

I am tasked with changing the precision of parts of an HPC application, bearing in mind that it makes ... when implicitly promoting a REAL? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - gfortran error: unexpected element '' in format string at (1)

I have a project written in VS2010 with Intel Visual Fortran. I have a dump subroutine to write a 2D matrix into ... ' in format string at (1) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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fortran - Function result has no implicit type

Below is a sample code that addresses the problem I am having. The error message I am getting is Function ... do end do end function Sample See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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536 views

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fortran - Error: If selector expression in SELECT TYPE is not a named variable, associate-name=> shall appear

I am trying to use a type in another type. However, I just cannot make it compile. It is strange to me: ... How can I make this code compile? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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fortran - OpenMP no threading in subroutine

I'm writing a matrix multiplication subroutine in Fortran. I'm using the Intel Fortran compiler. I've written ... appreciate any inputs on this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

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fortran - Subroutine with array element as argument

In my program subroutine stlstp passing work(2,1) as parameter to stlfts(...) subroutine. work(2,1) will be double ... (x, n, np, trend) end See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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900 views

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fortran - How to reverse a chain of characters?

I have to create a program that reverses phrases. For example: when I write hello guys, I want syug olleh ... (*,*)nomT end program reversing See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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589 views

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fortran - Defining a variable that must be declared constant, but changes in a loop

I'm testing out ranges of values (-1:34 just for kicks) for the function selected_real_kind to determine the kind ... t end do end program f1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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659 views

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fortran - Arithmetic involving integer and real operands

In Fortran, will arithmetic involving an integer and real operand be always carried out by converting the integer ... is there any exception? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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500 views

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fortran - Concise notation for inheriting size from other array?

In my code, I have a subroutine that takes a 5th-rank array as argument and uses a local variable, which ... the readability more than it helps. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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690 views

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fortran - Operator to check file existence

I want to create an operator .f. that checks whether a file exists so that I can write if (.f ... for having the mentioned functionality? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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534 views

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fortran - How to construct a matrix containing 9 smaller matrix

I have nine matrices whose dimension as (N by N) A1(i,j),A2(i,j),A3(i,j),A4(i,j),A5(i,j),A6(i,j),A7(i,j), ... ,j),A8(i,j),A9(i,j)] end do end do See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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712 views

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fortran - GFortran and CodeBlocks issue with Modules and Multiple Files

I am working with GFortran and CodeBlocks but I'm having an issue about Modules and Multiple files. i keep getting ... how to solve this issue? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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fortran - ISO_FORTRAN_ENV or -fdefault-real-8 to promote reals to double precision

I've always been using the -fdefault-real-8 option of gfortran to automatically promote every single REAL declared ... changing only that line. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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