graphics_dislin_test

graphics_dislin_test, a C code which illustrates how data can be displayed and analyzed graphically using the dislin() graphics library.

Some common plot types include:

• animation, a sequential display of images which are meant to suggest motion or evolution.
• bar, a display of values y(1:n) in which every value y(i) is represented by a bar of that height.
• bar3d, a display of values z(1:m,1:n) over a 2D grid, in which every value z(i,j) is represented by a bar of that height.
• barh, a display of values x(1:n) in which every value x(i) is represented by a horizontal bar of that length. The horizontal format can be more suitable for labeling bars when there are many of them.
• between, a line plot of a curve, and a filled plot of the area between the curve and the x-axis. Alternatively, a filled plot of the area between two curves.
• binary_tree, a connected directed graph with no circuits, in which each node has no more than 2 descendants.
• contour fill, a display of values z(x,y) in which the values of z are suggested by regions filled with color.
• contour line, a display of values z(x,y) in which the values of z are suggested by colored contour lines.
• decision_tree, a connected directed graph with no circuits, in which labeled nodes represent current states to be tested, and edges represent the choice or decision to move from one state to another.
• dendrogram, a connected directed graph with no circuits, which generally has a single root node, and illustrates the genealogy or relatedness of a set of objects.
• digraph, a "directed graph", nodes (possibly with defined locations, labels or colors), connected by directed edges (possibly with defined weights, labels, colors or linestyles).
• fill, a shape composed of polygons, each of which is filled with a particular color.
• graph, nodes (possibly with defined locations, labels or colors), connected by undirected edges (possibly with defined weights, labels, colors or linestyles).
• histogram, a display of values x in which the x range is divided into intervals, and the value y(i) represents the number of x values in the i-th interval, and a bar plot of intervals versus count is displayed.
• plot, a display of a single curve defined by a sequence of functional pairs (x,y(x)), or a function y=f(x) sampled over an interval, or a sequence of related pairs (x,y).
• plot3d, a 3D display of a single curve defined by a sequence of triples (x(i),y(i),z(i)), or a parametric function (x(t),y(t),z(t)) sampled over an interval.
• plots, several curves on a single display.
• scatter, a display of unconnected pairs (x,y), whose positions are indicated by markers.
• scatter3d, a 3D display of unconnected triples (x,y,z), whose positions are indicated by markers.
• scatters, a scatter plot involving several distinct sets of (x,y) pairs are displayed, distinguished by markers of different size, shape or color.
• subplots, a display involving two or more separate plots, shown as a single figure.
• surface, a 3D display of values z(x,y), represented as a surface.
• vector, a 2D display of vectors (u,v)(x,y), representing a gradient field, an ODE direction field, or a flow of some kind.

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

graphics_test is available in a C/dislin() version and a C/gnuplot() version and a C++/dislin() version and a C++/gnuplot() version and a Fortran90/dislin() version and a Fortran90/gnuplot() version and a MATLAB version and an Octave version and a Python version and an R version.

Related Data and Programs:

dislin_test, C codes which use dislin(), which is a scientific graphics package, by Helmut Michels.

gnuplot_test, C codes which write data and command files so that the gnuplot() graphics program can create plots of the results.

Reference:

1. Helmut Michels,
   The Data Plotting Software DISLIN - version 10.4,
   Shaker Media GmbH, January 2010,
   ISBN13: 978-3-86858-517-9.

Source code:

• graphics_dislin_test.sh, runs all the tests.

album_bar lists the year, and total number of music albums (LP's, cassettes, CD's and dowloads) sold each year from 2007 to 2017. This data is plotted as a bar graph. The dislin() library is used.

• album_data.txt, a data file
• album_bar.c, reads the data and makes a plot.
• album_bar.sh, runs the test.
• album_bar.txt, the output file.
• album_bar.png, a PNG image of the plot.

bulgaria_plot records the population in Bulgaria from 1887 to 2022. The graph should plot the data points as circles, and connect consecutive data points with straight line segments to suggest a curve. The dislin() library is used.

• bulgaria_data.txt, the data.
• bulgaria_plot.c, creates the data and displays a line plot.
• bulgaria_plot.sh, runs the test.
• bulgaria_plot.txt, the output file.
• bulgaria_plot.png, the plot.

circle_scatters depicts 500 pairs of (X,Y) data points in the unit square, 395 of which lie inside the unit circle, and 105 outside. If possible, the "inside" points should be blue, the "outside" points red, and the circle itself should also be drawn. The dislin library is used.

• circle1_data.txt, the coordinates of points inside the circle.
• circle2_data.txt, the coordinates of points outside the circle.
• circle_scatters.c, reads the data and makes a plot.
• circle_scatters.sh, runs the test.
• circle_scatters.txt, the output file.
• circle_scatters.png, the plot.

geyser_bar works with measurements of the waiting time in minutes between successive eruptions of the Old Faithful geyser. The data has been grouped into bins. The bin counts are displayed as a bar chart. The dislin library is used.

• geyser_bar_data.txt, bin centers, and occupancy counts, for waiting times.
• geyser_bar.c, reads the data and makes a plot.
• geyser_bar.sh, runs the test.
• geyser_bar.txt, the output file.
• geyser_bar.png, the plot.

grid_surface records, on a 41x41 grid over [-2,2]x[-2,+2], the values z = exp(-(x^2+y^2)) * cos(0.25*x) * sin(y) * cos(2*(x^2+y^2)). The data is to be plotted as a surface. The dislin library is used.

• grid_data.txt, the data.
• grid_surface.c, reads the data and makes a plot.
• grid_surface.sh, runs the test.
• grid_surface.txt, the output file.
• grid_surface.png, the plot.

lissajous_plot records 1000 points on a Lissajous curve defined by x=sin(3*t+pi/2), y=sin(4t). The curve is to be plotted and every tenth point marked. The dislin library is used.

• lissajous_data.txt, the data.
• lissajous_plot.c, reads the data and makes a plot.
• lissajous_plot.sh, runs the test.
• lissajous_plot.txt, the output file.
• lissajous_plot.png, the plot.

lynx_plot records the yearly lynx harvest from 1821 to 1934. The graph should plot the data points as circles, and connect consecutive data points with straight line segments to suggest a curve. The dislin library is used.

• lynx_data.txt, the data.
• lynx_plot.c, creates the data and displays a line plot.
• lynx_plot.sh, runs the test.
• lynx_plot.txt, the output file.
• lynx_plot.png, the plot.

orbital_line_contour records, on a 101x101 grid over [0,4*pi]x[0,4*pi], the minimum distance between two planets given a pair of orbital angles. The data is presented as a line contour plot. The dislin library is used.

• orbital_data.txt, the data.
• orbital_line_contour.c, reads the data and makes a plot.
• orbital_line_contour.sh, runs the test.
• orbital_line_contour.txt, the output file.
• orbital_line_contour.png, the plot.

random_scatter generates 500 pairs of (X,Y) data, which lie in the unit square, and tend to cluster around (0.5,0.5). The dislin library is used.

• random_data.txt, the data.
• random_scatter.c, creates the data and displays a scatter plot.
• random_scatter.sh, runs the test.
• random_scatter.txt, the output file.
• random_scatter.png, the plot.