DescriptionFloor function.svg	English: Graph of the floor function.
Date	30 March 2006 (original upload date)
Source	Own work
Author	No machine-readable author provided. Omegatron (talk · contribs) assumed (based on copyright claims).
Other versions
SVG development InfoField	The source code of this SVG is invalid due to 4 errors.   This W3C-invalid plot was created with Gnuplot.    This plot uses embedded text that can be easily translated using a text editor.

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

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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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

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See Wikipedia graph-making tips.

 # Set square 1000×1000 SVG output and filename
 # The font size (fsize) sets the size for the circles, too.
 set terminal svg enhanced size 1000 1000 fname "Times" fsize 36
 set output "floor.svg"

 # Set the text value for missing entries in the data file, so we can plot a [[w:discontinuous function|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 [-3.5:3.5]
 # Set x axis limits so the first and last points are hidden
 set xrange [-3.5:3.5]

 # No legend needed
 set nokey

 # Add lightly-colored axis lines
 set yzeroaxis
 set xzeroaxis

 # Plot as lines and also points (circles)
 plot "floor.dat" with lines
 plot "floor.dat" with points 1 6

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

and data file:

floor.dat

#  X     Y1
   -3    -4
   Skip
   -3    -3
   -2    -3
   Skip
   -2    -2
   -1    -2
   Skip
   -1    -1
   0     -1
   Skip
   0     0
   1     0
   Skip
   1     1
   2     1
   Skip
   2     2
   3     2
   Skip
   3     3
   4     3

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

• Mathworld's version