A simple module for generating plots from Fortran using Python's matplotlib.pyplot.
Currently, this module can be used to generate simple plots from Fortran. Eventually, it may be expanded to provide additional features and other types of plots.
The way it works is simply to generate a Python script with the plotting code, which
is then executed from the command line using the Fortran execute_command_line function.
The module requires a modern Fortran compiler (it uses various Fortran 2003/2008 features such as deferred-length strings). It should work fine with the latest gfortran or ifort compilers. A simple script build.sh is provided for building the library and test program (requires gfortran and FoBiS). It will also build the HTML documentation if FORD is installed. A fpm.toml file is also provided for use with the Fortran Package Manager.
matplotlib.pyplot.plot-- 2D/3D plot of lines and/or markersmatplotlib.pyplot.bar-- bar plotmatplotlib.pyplot.contour-- contour plotmatplotlib.pyplot.contourf-- filled contour plotmatplotlib.pyplot.imshow-- image plotmatplotlib.pyplot.hist-- histogram plotmatplotlib.pyplot.errorbar-- errorbar plot
The following example generates a plot of the sine function:
program test
use,intrinsic :: iso_fortran_env, only: wp => real64
use pyplot_module
implicit none
real(wp),dimension(100) :: x,sx
type(pyplot) :: plt
integer :: i
!generate some data:
x = [(real(i,wp), i=0,size(x)-1)]/5.0_wp
sx = sin(x)
!plot it:
call plt%initialize(grid=.true.,xlabel='angle (rad)',&
title='Plot of $\sin(x)$',legend=.true.)
call plt%add_plot(x,sx,label='$\sin(x)$',linestyle='b-o',markersize=5,linewidth=2)
call plt%savefig('sinx.png', pyfile='sinx.py')
end program test