File:Butterworth poles 4.svg

Summary[edit]

Source code[edit]

This graphics has been realized with the help of the following Octave script:

order = 4;
pointNb = 100;
axesLength = 1.25;
textOffset = 0.05;

angle = linspace(pi/2, 3*pi/2, pointNb);
poleAngles = pi/2 + pi * [1:order]/order - pi/(2*order);
poles = cos(poleAngles) + i * sin(poleAngles);

figure(1);
plot(cos(angle), sin(angle));
hold on;
plot([-axesLength, axesLength-1], [0, 0], 'k');
plot([0, 0], [-axesLength, axesLength], 'k');
plot(poles, 'xr');
hold off;
axis("equal", "off");
text(axesLength-1+textOffset, textOffset, "re(s)");
text(textOffset, axesLength+textOffset, "im(s)");
print -dsvg butterworth_poles_4.svg

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one. http://creativecommons.org/licenses/by-sa/3.0 CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue