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# Copyright (C) 2001-2016 Alan W. Irwin
# Simple line plot and multiple windows demo.
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PLplot is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
from numpy import *
# main
#
# Generates several simple line plots. Demonstrates:
# - subwindow capability
# - setting up the window, drawing plot, and labelling
# - changing the color
# - automatic axis rescaling to exponential notation
# - placing the axes in the middle of the box
# - gridded coordinate axes
def main(w):
# For starting from scratch this call to pladv increments cursub, but
# then the following plssub sets it to zero so the whole thing is
# essentially a nop. However, for the case when other examples are run
# first, this call to pladv is absolutely essential to finish the
# preceding page.
w.pladv(0)
# Do plots on 4 subwindows of the first page
w.plssub(2, 2)
# Do a plot with one range of data
plot1(w, 6., 1., 0., 0.)
# Do a plot with another range of data
digmax = 5
w.plsyax(digmax, 0)
plot1(w, 1., 0.0014, 0., 0.0185)
plot2(w)
plot3(w)
# Restore defaults
w.plssub(1, 1)
w.pleop()
# Must be done independently because otherwise this changes output files
# and destroys agreement with C examples.
#w.plcol0(1)
# ===============================================================
def plot1(w, xscale, yscale, xoff, yoff):
x = xoff + (xscale/60.)*(1+arange(60))
y = yoff + yscale*pow(x,2.)
xmin = x[0]
xmax = x[59]
ymin = y[0]
ymax = y[59]
xs = x[3::10]
ys = y[3::10]
# Set up the viewport and window using pl.env. The range in X
# is 0.0 to 6.0, and the range in Y is 0.0 to 30.0. The axes
# are scaled separately (just = 0), and we just draw a
# labelled box (axis = 0).
w.plcol0(1)
w.plenv(xmin, xmax, ymin, ymax, 0, 0)
w.plcol0(2)
w.pllab("(x)", "(y)", "#frPLplot Example 1 - y=x#u2")
# Plot the data points
w.plcol0(4)
w.plpoin(xs, ys, 9)
# Draw the line through the data
w.plcol0(3)
w.plline(x, y)
# ===============================================================
def plot2(w):
# Set up the viewport and window using pl.env. The range in X
# is -2.0 to 10.0, and the range in Y is -0.4 to 2.0. The axes
# are scaled separately (just = 0), and we draw a box with
# axes (axis = 1).
w.plcol0(1)
w.plenv(-2.0, 10.0, -0.4, 1.2, 0, 1)
w.plcol0(2)
w.pllab("(x)", "sin(x)/x", "#frPLplot Example 1 - Sinc Function")
# Fill up the arrays
x = (arange(100)-19)/6.0
if 0.0 in x:
#replace 0.0 by small value that gives the same sinc(x) result.
x[list(x).index(0.0)] = 1.e-30
y = sin(x)/x
# Draw the line
w.plcol0(3)
w.plwidth(2)
w.plline(x, y)
w.plwidth(1)
# ===============================================================
def plot3(w):
# For the final graph we wish to override the default tick
# intervals, so do not use pl.env
w.pladv(0)
# Use standard viewport, and define X range from 0 to 360
# degrees, Y range from -1.2 to 1.2.
w.plvsta()
w.plwind(0.0, 360.0, -1.2, 1.2)
# Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
w.plcol0(1)
w.plbox("bcnst", 60.0, 2, "bcnstv", 0.2, 2)
# Superimpose a dashed line grid, with 1.5 mm marks and spaces.
w.plstyl([1500], [1500])
w.plcol0(2)
w.plbox("g", 30.0, 0, "g", 0.2, 0)
w.plstyl([], [])
w.plcol0(3)
w.pllab("Angle (degrees)", "sine", "#frPLplot Example 1 - Sine function")
x = 3.6*arange(101)
y = sin((pi/180.)*x)
w.plcol0(4)
w.plline(x, y)
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