Plotting curves with increasing radius
8 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Dear all,
I wanted to know if there is any way to plot a curve with increasing radius. This curve has to go around a circle.
Thanks for your help.
8 Kommentare
Image Analyst
am 21 Aug. 2013
Bring up your diagram somehow on the computer, be it in Photoshop or whatever. Type alt-Printscreen to capture the current window into the clipboard. Go to http://snag.gy and type control-V to paste it in. Note the URL it gives you and come back here and tell us what it is.
Akzeptierte Antwort
Walter Roberson
am 21 Aug. 2013
Your sample diagram look like spirals to me, other than that the radius might not be increasing linearly.
Use pol2cart() to switch between an (r, theta) form vs (x,y) coordinates.
3 Kommentare
Kelly Kearney
am 21 Aug. 2013
I see a circle and two spirals. Is this what you're looking for?
theta = linspace(pi/2+2*pi, pi/2, 100);
r = cell(3,1);
r{1} = ones(size(theta)); % The circle
r{2} = linspace(1, 0.5, 60); % Spiral in
r{3} = linspace(1, 1.5, 60); % Spiral out
for ii = 1:3
[x{ii}, y{ii}] = pol2cart(theta(1:length(r{ii})), r{ii});
end
xy = [x;y]; plot(xy{:}); axis equal;
Weitere Antworten (2)
Image Analyst
am 21 Aug. 2013
You say "I have the data for them" so why don't you just use the plot() function and plot them? Am I missing something???
1 Kommentar
David Sanchez
am 21 Aug. 2013
Try this out:
[x,y] = meshgrid(1:150,1:100);
[th, rho] = cart2pol(x - 75,y - 50); % convert to polar
% spiral centered at (75,50)
Img = sin(r/3 + th);
imagesc(Img); colormap(hot);
axis equal; axis off;
Siehe auch
Kategorien
Mehr zu Surface and Mesh Plots finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!