a script to "make" several times in a loop

mike1982 · 02-07-2012, 10:59 AM

Dear All,

I am Running a fortran code with a .F file,that should be "make" each time and then run the executable file which have been produced. but i want to change some parameters in .F file each time and "make" this file and run exacutable file . dose any script exist to do this work?

the procedure is like below

for(10 times e.g)
{

1- change the parameter in .F
2- make
3-./myexecutable

}
thanks a lot.

kbp · 02-07-2012, 04:24 PM

No experience with fortran but can't you just call 'make PARAM=<blah>' ? .. then you could wrap it in a loop like:

Code:

for param in x y z a b c
do
   make PARAM=param
   ./executable
done

onebuck · 02-09-2012, 06:57 AM

Moved: This thread is more suitable in <Programming> and has been moved accordingly to help your thread/question get the exposure it deserves.

firstfire · 02-10-2012, 12:54 PM

Hi.

There are few ways to do what you want.

gfortran has native preprocessing support (enabled with -cpp option). You can define a macro on command line using -D option:

Code:

$ cat test.f 
      program hello
      print *, X
      end program hello
$ gfortran -cpp -D X='"hello"' test.f && ./a.out 
 hello
$ gfortran -cpp -D X=3.1415 test.f && ./a.out 
   3.1415000

If your compiler does not support preprocessing, you can just use cpp (the C PreProcessor) manually:

Code:

$ cpp -P -D X=15 ./test.f > test2.f
$ gfortran test2.f && ./a.out 
          15

The `-P' flag inhibits generation of linemarkers in the output from the preprocessor which may confuse your compiler.

If you really need to use `make', try something like (in case of gfortran)

Code:

$ cat Makefile 
.PHONY: test
test: test.f
        gfortran $(CPPFLAGS) $< -o $@
$ make CPPFLAGS='-cpp -DX=5'
gfortran -cpp -DX=5 test.f -o test
$ ./test
           5

Use make only if your program consists of multiple files.

Now you can change parameter in a loop as follows:

Code:

$ for x in Hello cruel world; do gfortran -cpp -D X="'$x'" test.f ; ./a.out; done
 Hello
 cruel
 world

Here we comple and run the program three times.

Hope this helps.

PS: Mature programs usually use command line options and/or configuration files to alter its behaviour (so that recompilation is not necessary), but I understand that it is overkill for smaller projects.