Programming :: How To Call Fortran Subroutine From IDL

Sep 29, 2010

There are examples everywhere about calling f77 subroutine from IDL, but I have not found any material about IDL calling fortran written in f90 way(free style). I tried the following example, but write the subroutines in free style. When I run the makefile, it gives an error 'undefined reference to main_'.

Code:

SUBROUTINE SUM_ARRAY(argc, argv) !Called by IDL
INTEGER*4 argc, argv(*) !Argc and Argv are integers
j = LOC(argc) !Obtains the number of arguments (argc)

[code]....

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Programming :: C++ Program Calling A Fortran Subroutine With A Function In The Argument?

Mar 9, 2011

I have a new problem; i want to call a subroutine's fortran which have a function in the argument and the compilation ran properly, but when i execute the program this shows me an "Segmentation fault". This is my c++ program:

Code: //Main.cpp
#include <stdio.h>
#include <iostream>

[code]....

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Programming :: Calling Subroutine In Perl

Aug 19, 2010

What is the difference in perl between:

'function();'

and

'&function();'

with and without ampersand.

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Programming :: Incorporating Subroutine In Main Program?

May 23, 2011

Say, i have a main program called as vauto.f ( written in F77 ) and complied with gfortran and run successfully using the help from Mr. Colucix ( Many thanks, Mr. Colucix ). Got an output file (RFILE) after running this program. I want to post process this out put file giving this as input to some other program, that is written as sub routine in a separate file, four.f. I tried to incorporate this subroutine into the main program v.auto.f and ran into several compiling errors and before saving those errors my system went dead so could not post here the errors ( sorry about that ).Think myself as a very new programer. what would you advice me to do??

==a. create an object file of that subroutine file and link that to main file and compile both of them and get output fileb. After obtaining the result file from the first program (RFILE), run this subroutine ( but how to do that?? is my question bugging me for more than 4 days, tried different things and met with failure ).=====
For our kind attention, have attached the main program (vauto.f), RFILE, four.

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Programming :: Calling Fortran 95 Code In C?

Apr 15, 2009

I'm trying to call some Fortran 95 code in C, but I'm having problems with integers not having the same value in C as in Fortran, and changing values upon each run of the program. I think it has to do with the integer type, but I don't know how to fix it. I'm running Gentoo x86. Here are the files I've got:

foo.c:

Code:

#include <stdio.h>
extern int qux_();
main() {

[code]....

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Programming :: Calling Routines In Fortran Modules From C++?

Jan 21, 2011

I want to call a subroutine in Fortran 90 from a c++ code. I can do it, when the fortran code have no module. But i need to call the subroutine in a fortran code that have an module. I have a simple program that shows my problem. The Fortran code is:

Code: !add2.f90
Module add2
Implicit none
Contains

[code]....

collect2: ld returned 1 exit status I Dont know where is the problem. Maybe it is in the call of the function. I found that the syntax have this form: extern void __namemodule__NMOD_namesubrutine(arg)

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Programming :: Comparing Data In Array In FORTRAN?

May 16, 2010

I have two arrays of data, called data1.dat and data2.dat. each contains 60 data. What I want to do is to compare the data in each file and write the counting into bins. It goes like this. First, take the first data in data1.dat file and compare with the 60 data in data2.dat file. If there is any data which is same with the data in data1.dat then it count in bin. The total bins are also 60. Next it goes to the second data in data1.dat and compare with all the 60 data in data2.dat. If there is any data same then it add in second bin. And it repeats to all the data in data1.dat

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Programming :: Fortran Code On 32/64bit Machine

Jun 10, 2009

I'm not a Fortran coder but I need to call the sub-routine ADAPT.f from a c code.This subroutine calculates a multiple integral of a given function.My problem is that the c code works with no problem in a 32 bit machine but it does not in a 64 bit machine, and the problem seems to be related to adapt, which calculations gives a NA rather than the result of integration.Since fortran is quite obscure for me, I don't know why is this happening. Maybe I should change some data type (from real to double), but I'm not sure. Does anyone have a clue?

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Programming :: Fortran How To Open A File In Loop

Jun 29, 2011

I have a 50 file name NSSAVE0001.vtk to NSSAVE0050.vtk.Do I have to manually type individually command to open each file or can I have a loop to open file?

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Programming :: Get An Error Using A Namelist In A Fortran 90 Program ?

Aug 26, 2010

I have a program which reads some parameters in from an input file before solving a differential equation. This program compiles fine, I'm using Numerical Algorithms Group (NAG) libraries to solve the differential equation so I'm also the NAG compiler called nagfor.

The namelist I have is declared as follows:

And the input file is:

When I run the code I get the following error message:

I really can't see what's wrong with this code.

Also, I'm using Fedora 11, and running the code in tcsh if this is relevant.

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Programming :: Fortran 90 Code - Makefile Insensitive To Change

Mar 10, 2011

I am dealing with one FORTRAN 90 code, have made small changes.

milenko@milenkons:~/mt4$ make mt4
make: 'mt4' is up to date.
milenko@milenkons:~/mt4$ ifort -c MT2DDIB1.FOR
milenko@milenkons:~/mt4$ make mt4
make: 'mt4' is up to date.
milenko@milenkons:~/mt4$ make mt4
make: 'mt4' is up to date.
milenko@milenkons:~/mt4$ make mt4
make: 'mt4' is up to date.

I go for make command but it does not see that the source code has been modified.Than I do compilation from command line,try make again but no use.
F95=ifort
FFLAFGS= -O1

mt3: driver_mt2ddi.o constants.o settings.o params.o mt2dmod.o fdsystem.o mt2ddat.o mt2dsens.o
$(F95) -o $(FFLAGS) mt3 constants.o settings.o params.o mt2dmod.o fdsystem.o mt2ddat.o mt2dsens.o driver_mt2ddi.o
driver_mt2ddi.o: driver_mt2ddi.for constants.o settings.o params.o mt2dmod.o fdsystem.o mt2ddat.o mt2dsens.o
$(F95) -c $(FFLAGS) driver_mt2ddi.for

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Programming :: Generating Files With Different Names At Each Loop In Fortran?

Nov 7, 2010

I am trying to write a loop to open four main-data-files. At each open of the main-data-file, I want the loop to open another four sub-files and split the data from the mail-data-file according to the creteria and dump into the four files. When the loop goes to the second main-data-file, it shall generate another 4 sub-files with different file name. And the process goes on. That means I will have total of 16 sub files for the four main-data-files. Each four files from the 16 files shall have specific name on it. Based on the code which I given below, I would say when the file at UNIT=100 is opened, 4 new files needed to be opened as well. They are:

maximum_dist_001_064.dat
maximum_dist_065_128.dat
maximum_dist_129_192.dat
maximum_dist_193_256.dat

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Programming :: Fortran Program--encountered Run Time Error?

May 19, 2011

i am graduate student and my X colleague gave me this Fortran 77 program to run my result files with. She is no longer reachable. I compiled the following program with gfortran, it compiled well but, when i run it, gave me end of file error. My output file (which is the input file for this program (DFILE1) ) has about 78,000 lines of velocities of atoms (Vx, Vy, Vz with 1000 steps.. an example of some of the atom's velocities in the 1st step is given at the end of this program). I will be highly obliged if any one can help me with this.I run this program on opensuse linux 11.3 version /32 bit/i586

error message:

Code:
At line 124 of file v.autocorrelation.f (unit = 10, file = 'DFILE1')
Fortran runtime error: End of file

Code:
PROGRAM TCORR

COMMON / BLOCK1 / STORX, STORY, STORZ
COMMON / BLOCK2 / VX, VY, VZ
COMMON / BLOCK3 / VACF, ANORM
C *******************************************************************
code....

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Programming :: Local Dynamically Allocated Array In Fortran?

Oct 19, 2009

I (my friend) have a fortran program with the code along the following lines:

Code:

SUBROUTINE NY
REAL, DIMENSION(4000,4000) :: a, b, c
...
RETURN
END SUBROUTINE PARAMETERS

The problem is that the huge matrices are retained in memory even after the subroutine ends. Is there an easy way to declare the arrays in a sort of dynamic way, like they were in the following C example?

Code:

void ny(void) {
double a[4000,4000];
...
}

I mean in the C example the memory is released as soon ny() exits.

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Programming :: Fortran - Array-valued Function Leads To Segfault?

Jun 8, 2010

I'm trying to implement a solver for a system of differential equations in Fortran. The solver contains a number of functions which are supposed take real values, 1D arrays of real values or both as arguments and return arrays of real numbers, all of which cause the program to segfault. Example:

Code:

function y_exakt(t)
implicit none
real::t, pi

[code]....

(the last number in the array seems to change randomly). Then the program crashes either when f(t,y) is called or when dy is returned (after removing the call to f). What could cause these (memory?) problems and/or what could I do to identify the problem? Increasing the maximum stack size with ulimit or compiling the program with -fno-automatic has had no effect. I'm using gfortran (gcc 4.4.3) on a 64-bit Ubuntu Lucid machine. The complete program can be found at [URL].

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Programming :: Fortran Runtime Error: Bad Value During Floating Point Read

Jun 28, 2011

I am getting error Fortran runtime error: Bad value during floating point read. How do I format negative sign?

[code]...

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Programming :: Put Blank Spaces In Between List Of Numbers Generated In FORTRAN?

Aug 25, 2010

I have two sets of data. 1,2,3,4 and 6,7,8 and I have written a fortran code to put them in order as below:

program gap
implicit none
integer:: i, j
do i = 1,4
do j = 6, 8

[Code]...

I want a space once every row loop has finish.I am dont know how to write the data as shown above using the fortran code in this post.

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Programming :: Save The Results Of A Fortran Loop In A Text File?

Nov 2, 2010

I am trying to store the results of my code to a separate text file.But the problem is, as my results comes from a loop, my text file shows only the last result, not all of them.Like if the loop runs 5 time the text file shows the result for the 5th step.But i need to store all of them (1 to 5).Can I use awk to print the output field and store to another file and creat a new line so that the next output field goes to a new line?(just an idea, dont know).

#!/bin/basth
for (( i=1; i<=5; i++))
do
./file.exe > output.txt
done

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Programming :: Linking Of Fortran Executable Taking Exorbitant Amounts Of Time?

Mar 24, 2010

The issue I am currently facing is more of an annoyance / curiosity, and it may not even be a problem, but it sure feels like one. Background: I am becoming a computational chemist (grad school begins in the fall) and the code I run is all in fortran. I am currently compiling with gfortran. When I compile the code (on a box running ubuntu server), everything appears to compile fine, but the linking stage is taking five to ten minutes. I ran the time command while making it and got the following results.

Quote:

time make
gfortran -c -O3 -fomit-frame-pointer -finline-functions -ffast-math suijtab.f
Linking testCompile ...
done

[code]...

I just don't understand why it is taking 5 minutes of real time if it only takes 10 - 15 sec of system time?

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Programming :: New MPICH2 Installation - Interfering - With -make - Cant Compile Fortran Programs

Jul 28, 2011

Actually I had a folder called Lib, in which I had a few libraries installed and configured.(MPI, PETSc, SLEPc) I accidently deleted (by rm) the contents of that folder.

Then I reinstalled MPI,PETSC,SLEPC using the same tarballs as earlier(thus, the version etc. is the same).

I already had a fortran program with many modules and subroutine files, and the corresponding makefile which used to compile and run fine. But now when I type "make" in the same directory as before, I get this: (shortened, many similar errors)

Code:

Firstly, why is mpif90 compiling my program when I didnt tell it to? In my makefile, I have specified gfortran as my compiler....nowhere have I even mentioned mpif90. Such a thing never used to occur before.

Also, if I rename file_variable.f to file_variable.f90, these errors dissappear (I understand why, but that is not the problem), but a new error comes:

Why is the new MPI installation interfering with make ? I want to go back to how things were before I stupidly broke all installations. The errors themselves are not the problem, the problem is why the new mpi installation is interfering with make.

It seems as if mpif90 has taken over make and gfortran. I suppose I didnt install it correctly, or probably I didnt uninstall the earlier one correctly.

Everything that worked earlier doesnt work suddenly. I use ubuntu 11.04 MPICH2-1.3.2

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Programming :: Fortran - Automatically Find The Starting And Ending Line Of Desired Variable?

Jun 23, 2011

I am loading the file in Fortran. File looks something like this (shown below) I am interested in Velocity values and not Pressure values. Is there a way to code in Fortran which finds the staring LINE of Velocity values and ending LINE of values or I have to manually find the lines? IN this case it should return Starting line : 9 Ending line: 11

PHP Code:

[code]....

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Programming :: Fortran OpenMPI-1.4.1 Installation / Compiling - Error Message Saying Mpif Not Recognized Command

Feb 4, 2010

I've installed openMPI-1.4.1 on my laptop and I'm trying to compile some fortran code I've written using MPI. I downloaded the openMPI-1.4.1 file from the openMPI website and used the shell script they provide to install it. This is the shell script:

shell$ cd openmpi-1.4.1
shell$ ./configure --prefix=/usr/local
shell$ make all install

There was an additional line extracting the tar file, but I did this by hand. The first time I ran this script there was an error on the final stage saying that a directory couldn't be created because of lack of permission. I decided to run the script again this time as a sudo.

Having run the script again everything appeared to install properly, however when I went to compile some fairly simple code I got a message saying that the compiler couldn't find MPI. I was using this command: gfortran messages.f90 -o messages I looked on the openMPI website where it recommends compiling with a compiler called mpif. However when I type mpif messages.f90 -o messages I get an error message saying mpif isn't a recognized command......

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Programming :: Add Switch To Every Gcc/g++ Call?

Feb 23, 2009

I was wondering if there was a way to add a switch to a gcc/g++ call everytime. I have a few libraries that I need to compile for different processors. Each has a makefile which calls gcc to compile. Here is the best option I could come up with so far:Include a Makefile and define CC as gcc -mcpu=xxx.

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Programming :: Call C Executable Inside C

Jan 8, 2010

i have only basic knowledge of C so guys plz help me...is C language support call the C executable inside the C ?example contect mainA.c have a many function define in the struct,when i compile mainA and make a executable the name is ( A ),can i use executable C inside the C <my C program call the executable ( A ) > .

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Programming :: Execvp System Call?

Apr 3, 2011

in below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?

Code:
/*
A _very_ limited shell program

[code]....

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Programming :: Call The Executable File From The GUI?

Jun 1, 2010

I have created a executable file using c and I have also created a GUI using GTK+. Now how can I call the executable file from the GUI with arguments passing to the executable file.

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Software :: Script That Call A Java Program That Call A System Command?

Nov 29, 2010

In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab

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Programming :: SSL_write Returns SSL_ERROR_SYSCALL, EOF On Second Call

Oct 8, 2010

I am facing issue in my OPENSSL code. I have written openssl client. It sends request to the host and receives response for that request.

My problem is, it connects, sends request successfully to host at first time only in sencond attempt it fails on SSL_write(). where SSL_get_error() returns SSL_ERROR_SYSCALL error.

In that ERR_get_error() returns 0. man page shows "If ret == 0, an EOF was observed that violates the protocol".

Code Snippet.
w=SSL_write(SSLRequestData.ssl,c2s,c2sl);
switch(SSL_get_error(SSLRequestData.ssl,w))
{
case SSL_ERROR_NONE:
if(c2sl!=w)

[Code]....

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Programming :: Clarification In The Select System Call?

Dec 8, 2010

I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..

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Programming :: C - System Call & Error Checking?

Sep 18, 2010

I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:

#include "shell.h"
#include <stdio.h>
#include <string.h>

[code]....

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