File: x01.py

package info (click to toggle)
plplot 5.15.0%2Bdfsg-19
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 31,312 kB
  • sloc: ansic: 79,707; xml: 28,583; cpp: 20,033; ada: 19,456; tcl: 12,081; f90: 11,431; ml: 7,276; java: 6,863; python: 6,792; sh: 3,274; perl: 828; lisp: 75; makefile: 50; sed: 34; fortran: 5
file content (164 lines) | stat: -rw-r--r-- 4,376 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
#  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)