Recent questions tagged Fortran

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fortran - Result of GAMMA underflows its kind

I would like to calculate gamma(-170.1) using the program below: program arithmetic ! program to do a calculation real ... x as I've defined 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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fortran - Using OpenMP critical and ordered

I've quite new to Fortran and OpenMP, but I'm trying to get my bearings. I have a piece of code for ... PARALLEL Thanks very much 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 - Testing floating point numbers equality

I am using gfortran in MinGW under Windows 7 (32bit) to compile Fortran code. Here is the minimal code contained ... What is the problem here? 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 - Associated pointers in derived type? gFortran vs. Intel

I would like to check if a pointer inside a derived type has already been defined or not. I wrote the ... thanks in advance for your help! 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 return type mismatch

I'm attempting to recode an old C++ program in Fortran to make use of LAPACK (I'm aware that C++ does ... this in Fortran is not an option. 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 operator overloading: function or subroutine

I recently updated my .f90 code to .f03, and I was expecting to see speedup because my older version ... on this is greatly appreciated! 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 - precision of real variable

I have the following code in FORTRAN 77: REAL*8 :: dm dm=1.-1.E-12 write(6,*) 'dm: ', dm I get: ... OK? I would like to get dm=0.999999999999 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 - What is the effect of passing an allocatable variable into a subroutine with non-allocatable argument?

Say we have this variable definition Real*8, Dimension(:), Allocatable :: dblA Allocate (dblA(1000)) Now I ... practice? Should I avoid 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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fortran - Puzzling performance difference between ifort and gfortran

Recently, I read a post on Stack Overflow about finding integers that are perfect squares. As I wanted to play ... looks like they fixed that. 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 - Best practice when working with double precision magic numbers

Do I necessarily need to specify D (e.g., 1.234D+00) at the end of all magic numbers ( ... already declared everything double precision anyway? See Question&Answers more detail:os...

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

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703 views

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fortran - Writing assumed-size array causes "upper bound shall not be omitted..."

I am writing code to add on a closed-source Finite-Element Framework that forces me (due to relying on some ... to an assumed size array. 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 - Integer output formatting with print statement

I've noted that if I use integer(16) variables, when I use print, the output contains the exact number of ... Does anyone know why this occurs? 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 - Strange Function Call behavior

I am quite new to Fortran and I was 'playing' with functions. I found a quite weird behavior in a very ... . What am I missing here? See Question&Answers more detail:os...

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

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988 views

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fortran - Error: Rank mismatch in array reference at (1) (2/1)

I kindly request your help on this code where I kept on getting an error: Rank mismatch in array reference at ... 2 enddo enddo enddo return 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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fortran - How to pass a function with multiple arguments to a subroutine that expects a function with only one argument?

I have a subroutine (minimal example) subroutine treatfunction(f,input,output) external, real::f real, intent(in ... subroutine is not elegant. See Question&Answers more detail:os...

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

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443 views

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fortran - Makefile with different source types

I am trying to write a makefile for compiling a program with source files with both .f and .f90 extensions. I ... with the .f files as well? 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 - Size of array after a deallocate

I have created an allocatable array. I allocate the elements and then I print the size of the array. I find strange ... "fred: ", Size (fred) 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 - Error: Non-numeric character in statement label at (1)?

I wrote the following two lines in fortran C23456789 REAL H3 = 0 H3=H*H*H and I received the following ... current column used in the program. See Question&Answers more detail:os...

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

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538 views

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fortran - Length-parameterized passed object to type-bound procedure has gfortran complain

I'm learning Fortran and I'd like to encapsulate an array and a subroutine in a type. The ... something regarding dummy argument definition? 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 - OpenMP Several "shared"-directives?

Hey there, I have a very long list of shared variables in OpenMP so I have to split lines in fortran and use ... Any advices on how to do 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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fortran - Is it necessary to check an optional argument before passing it to another optional argument?

I have the following question concerning the usage of optional argument. Let's say I have the following routine ... Thanks for your help. 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 - Is there anything wrong with passing an unallocated array to a routine without an explicit interface?

Consider: program main real, allocatable, dimension(:) :: foo integer n n=10 call dofoo(foo,n,1) allocate( ... behave in a system dependent way? 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 - Dynamic function creation from another function

I have a Fortran 90 subroutine which takes a function as an argument, and I would like to pass a modified version ... be as hacky as you want. 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 - Can the shape of an array in an interface match multiple fixed array size?

I have multiple subroutines with a parameter p which is an array of explicit size like subroutine foo(p) integer, ... on windows 7 64 bits). 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 - Missing explicit interface for subroutine

I just want to read a two-column text file with variable lines into an array. The first column of the text ... this error, thanks for any help. See Question&Answers more detail:os...

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

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340 views

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fortran - Allocate dynamic array with interdependent dimensions

This is a bit complicated; I'd welcome any comments on how to improve the clarity of the question. Ok, ... derived type within a derived type? See Question&Answers more detail:os...

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

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622 views

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fortran - Pointers in pure functions

In order to traverse a linked list in Fortran, I use a pointer to the current element that is moved to the ... that intent(in) is not violated? See Question&Answers more detail:os...

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

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612 views

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fortran - Skip a line from text file in Fortran90

I'm writing in fortran (90). My program must read file1, do something with every line of it and write ... a combination of text and numbers. See Question&Answers more detail:os...

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

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