Plot from your solver or from a gnuplot script, and open the result in any browser — zoom, pan, live reload while the job runs. No Python, no gnuplot, nothing but a Fortran compiler.
This is a foresight page, live: zoom with the wheel, drag to pan, press a to come back. The dashboard of the tutorial run, written by a ten-line gnuplot script.
From the arrays of your program, or from the log it writes: the same plot, the same page.
use foresight, only : figure_object, I4P, R8P
implicit none
type(figure_object) :: fig ! the figure: one plot, gnuplot defaults
real(R8P), allocatable :: it(:) ! iterations
real(R8P), allocatable :: res(:) ! continuity residual
integer(I4P) :: i
it = [(real(i, R8P), i = 1, 120)]
res = 10.0_R8P**(-0.045_R8P * it) * (1.0_R8P + 0.35_R8P * sin(it / 3.0_R8P))
call fig%init(width=640_I4P, height=380_I4P)
call fig%set_title('Residual history')
call fig%set_xlabel('iteration')
call fig%set_ylabel('continuity residual')
call fig%plot(it, res, title='continuity')
call fig%save('ch1.html') ! interactive page
call fig%save('ch1.svg') ! static image, the same drawing# Tutorial 4: the solver log, plotted by a script.
set terminal html size 640,380
set output 'ch4.html'
set title 'Residual history'
set xlabel 'iteration'; set ylabel 'residual'
set logscale y
set grid
plot 'run.dat' using 1:2 with lines title 'continuity', \
'' using 1:3 with lines title 'momentum', \
'' using 1:4 every 8 with linespoints pt 7 title 'energy'fobis build --mode foresight-static-gnu # the library, lib/libforesight.a
fobis build --mode foresight-gnu # the command line, bin/foresight
foresight --watch residuals.gp # re-render while the solver writes run.datEvery image here is an actual foresight output, regenerated from the cookbook recipes and checked by the CI.
The same scripts over ssh: characters, Unicode blocks or Braille dots, in ANSI colors, redrawn in place by --watch.
$ foresight cb_block.gp
0.6⡏⠉⠉⠉⠉⠉⠉⠉⠉⠙⠉⠉⠉⠉⠉⠉⠉⠉⠉⠋⠉⠉⠉⠉⠉⠉⠉⠉⠙⠉⠉⠉⠉⠉⠉⠉⠉⠉⠋⠉⠉⠉⠉⠉⠉⠉⠉⠙cd⢉⣉⣉⣉⣉⣉⠉⡇
⣇ ⡇
⡏⢆ ⡇
0.5⡏⠙⡄ ⠈⡇
⡇ ⢣ ⡇
⡇ ⠈⡆ ⡇
0.4⡏⠁ ⢱ ⠈⡇
⡇ ⠈⡆ ⢀⠔⠒⠒⢄⡀ ⡇
0.3⣇⡀ ⢸ ⡔⠁ ⠈⠢⣀ ⢀⣀⡠⠤⠤⠤⠤⣀⣀⣀ ⢀⣀⣀⣀⣀⣀⣀⣀⡇
⡇ ⢇ ⢀⠜ ⠑⠢⠤⣀⡠⠤⠒⠊⠁ ⠉⠉⠉⠉⠉⠉⠉⠉⠁ ⡇
⡇ ⠘⡄ ⢀⠎ ⡇
0.2⣇⡀ ⠘⡄ ⡠⠊ ⢀⡇
⡇ ⠘⠢⠒⠁ ⡇
⡇ ⡇
0.1⣇⣀⣀⣀⣀⣀⣀⣀⣀⣠⣀⣀⣀⣀⣀⣀⣀⣀⣀⣄⣀⣀⣀⣀⣀⣀⣀⣀⣠⣀⣀⣀⣀⣀⣀⣀⣀⣀⣄⣀⣀⣀⣀⣀⣀⣀⣀⣠⣀⣀⣀⣀⣀⣀⣀⣀⣀⡇
0 20 40 60 80 100 120$ foresight cb_readout_dumb.gp
0.55+----+-----+----+----+-----+----+----+-----+----+----+-----+----+
|* +----------------------+ |
0.5+ * |CD | +
| * | _ _ _ _ _ | |
| * || | _| | | | | |_| | |
0.45+ * ||_|. _| |_| |_| |_| | +
| * | | |
0.4+ * +----------------------+ +
| * |
| * |
0.35+ * ****** +
| * * ** |
| * * * ********* ***** |
0.3+ * * *** **** ************* **+
| * * ****** |
0.25+ * * +
| * * |
| * * |
0.2+ ** * +
| *** |
0.15+----+-----+----+----+-----+----+----+-----+----+----+-----+----+
0 10 20 30 40 50 60 70 80 90 100 110 120$ foresight cb_dumb.gp
0.6+--------+---------+--------+---------+--------+cd******-+
| |
|* |
0.5+* +
| * |
| * |
0.4+ * +
| * ****** |
0.3+ * ** *** ********** ********+
| * ** ********* ********* |
| ** ** |
0.2+ ** ** +
| *** |
| |
0.1+--------+---------+--------+---------+--------+---------+
0 20 40 60 80 100 120foresight is distributed under the GNU General Public License v3.