Image:Sinc function (normalized).svg

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Sinc_function_(normalized).svg‎ (23KB, MIME type: image/svg+xml)

This is a file from the Wikimedia Commons. The description on its description page there is shown below.

Unnormalized

Normalized

Both

Graph of the normalized sinc function sin(πx)/(πx).

[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 samples 400
set terminal svg enhanced size 1300 975 fname "Times" fsize 36
set output "sinc function (normalized).svg"

# Set y axis limits so the plot doesn't go right to the edges of the graph 
set yrange [-0.3:1.1]
set xrange [-6:6]

set lmargin 5
set bmargin -5

# No legend needed
set nokey

# Add lightly-colored axis lines
set yzeroaxis
set xzeroaxis

# Put a y-axis tic at every 0.2
set ytics 0.2
set mytics 4

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

# Put an x-axis tic at every integer
set xtics 1
set format x "%2.0f"
set mxtics 5

# Plot as lines
plot sin(pi*x)/(pi*x) with lines
 
# Close the file (so I don't have to close gnuplot to view it)
set output

Then I opened the resulting SVG file in Inkscape, changed the line colors, brought the plot lines to the top, made all the lines 3 px wide, made the grid lines 2px wide and 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".