Plotting curves with increasing radius
8 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
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 Commenti
Image Analyst
il 21 Ago 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.
Risposta accettata
Walter Roberson
il 21 Ago 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 Commenti
Kelly Kearney
il 21 Ago 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;
Più risposte (2)
Image Analyst
il 21 Ago 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 Commento
David Sanchez
il 21 Ago 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;
Vedere anche
Categorie
Scopri di più su Surface and Mesh Plots in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!