Image:Rectangular function.svg

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Rectangular_function.svg‎ (1300 × 975 pixel, file size: 15 KB, MIME type: image/svg+xml)

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Graph of the Rectangular function. Attempt at better version of w:Image:rect function.png

[edit] Instructions

See Wikipedia graph-making tips.

Generated in gnuplot with the following script:

# Set 1300×975 SVG output and filename
# The font size (fsize) sets the size for the circles, too.
set terminal svg enhanced size 1300 975 fname "Times" fsize 36
set output "Rectangular function.svg"

# Set the text value for missing entries in the data file, so we can plot a discontinuous function
set datafile missing "Skip"  

# Set y axis limits so the plot doesn't go right to the edges of the graph 
set yrange [-0.5:1.5]
set xrange [-1.5:1.5]

set lmargin 5
set bmargin -5

# No legend needed
set nokey

# Add lightly-colored axis lines
set yzeroaxis
set xzeroaxis

# Put a tic at every half integer
set xtics 0.5
set ytics 0.5
set mxtics 4
set mytics 4

# Format tics as digit with one decimal place
set format x "%2.1f"
set format y "%2.1f"

# Plot as lines and also points
# Different line styles are plotted as separate lines for ease of post-processing
plot "solidlines.dat" with lines, "dashedlines.dat" with lines, "filledpoints.dat" with points pt 6, "hollowpoints.dat" with points pt 6
 
# with points:
# 1 = color red (linestyle 1?)
# 6 = point style 6 (render as circles in SVG)

# Close the file (so I don't have to close gnuplot to view it)
set output

and data files:

solidlines.dat

#   X       Y
    -1.5    0
    -0.5    0
    Skip
    -0.5    1
    0.5     1
    Skip
    0.5     0
    1.5     0

dashedlines.dat

#   X       Y
    -0.5    0
    -0.5    1
    Skip
    0.5     1
    0.5     0

filledpoints.dat

#   X       Y
    -0.5    0.5
    0.5     0.5

hollowpoints.dat

#   X       Y
    -0.5    0
    -0.5    1
    0.5     1
    0.5     0

Then I opened the resulting SVG file in Inkscape, changed the fill style for the circles (either blue or white fill), line styles (to do dashed lines), brought the plot lines to the top, and then brought the circles to the top (over the lines).

I also made all the lines 2 px wide, and made the axes 50% transparency.

[edit] License

Source: Created by User:Omegatron using gnuplot, possibly with post-processing in the GIMP (PNG) or Inkscape (SVG)

I, the author of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".