Diff for "PythonCourse/PythonLES/F2Py"

Differences between revisions 4 and 14 (spanning 10 versions)

F2PY

Contents

A tool that provides connection between Python and Fortran languages Official website

Type:

f2py # to see the usage options
f2py -c --help-fcompiler # to see what local fortran compilers does f2py recognize

f2py wraps Fortran code and allows to use it as a Python module.

"Hello world"

C File hello_world.f
      subroutine foo (a)
      integer a
      print*, "Hello from Fortran!"
      print*, "a=",a
      end

Compile:

f2py -c -m hello hello.f --fcompiler=gfortran

Try it in Python:

import hello
print hello.__doc__
hello.foo(4)

file (watermask, 10x10 degrees, 250m resolution): /home/zmaw/m300036/PythonSeminar/watermask/MOD44W.A2000055.h18v04.005.2009212173853.hdf

Real world example: moving window averaging

LehreWiki: PythonCourse/PythonLES/F2Py (last edited 2012-12-06 09:23:18 by MikhailItkin)

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+f2py wraps Fortran code and allows to use it as a Python module.

== "Hello world" ==
{{{
C File hello_world.f
      subroutine foo (a)
      integer a
      print*, "Hello from Fortran!"
      print*, "a=",a
      end
}}}
Compile:

{{{
f2py -c -m hello hello.f --fcompiler=gfortran
}}}
Try it in Python:

{{{
import hello
print hello.__doc__
hello.foo(4)
}}}

== Compare pure Python and Python+Fortran ==

file (watermask, 10x10 degrees, 250m resolution):  {{{/home/zmaw/m300036/PythonSeminar/watermask/MOD44W.A2000055.h18v04.005.2009212173853.hdf}}}


Real world example: moving window averaging

 * Fortran code: [[ /ArStats | code ]]
 * Python code: [[/ResizeWaterMaskPython | code]]
 * Fortran+Python: [[ /ResizeWaterMaskFortran | code]]