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quiverwcolorbar

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11 Feb 2013 (Updated )

Generates a quiver plot colored according to vector magnitude and/or user specified axis boundaries.

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Description

quiverwcolorbar adds functionality to the original quiver function by assigning color to the arrows according to the vector magnitude. The corresponding colorbar spans the minimum and maximum values of the dataset or can be specified by the user. Any changes to the colorbar boundaries change the vector colors accordingly.

   Syntax:
      quiverwcolorbar(x,y,u,v,scale,'bounds',[colormin colormax])

   Inputs:
      x, y: Vector locations
      u, v: Vector directions (East-West, North-South)
      scale: Scalar value to set vector lengths
      'bounds': Optional setting to specify colorbar axis minimum and maximum values

   Example:
      x = rand(1,50).*100;
      y = rand(1,50).*100;
      u = rand(1,50) .* 10;
      v = rand(1,50) .* 10;
      scale = 0;
      figure; quiverwcolorbar(x',y',u',v',scale); %compare to:
      figure; quiverwcolorbar(x',y',u',v',scale,'bounds',[0 10]);

Acknowledgements

Quiver2.M V1.2 (Nov 2009), Quiverc, Quiverc2wcmap, and Vfield Color inspired this file.

MATLAB release MATLAB 7.8 (R2009a)
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Comments and Ratings (5)
24 May 2013 sundar

Thanks for the quick reply.
I just figured out that when I use imagesc instead of imshow it works fine.

clf;imagesc(Image)
hold on
quiverwcolorbar(x,y,u,v)

This works good.

24 May 2013 Melissa Day

sundar, I'm not familiar with imshow, but the velocity coloring and the colorbar are not linked in this program quite like they are normally, which might be an issue. When I use imshow(quiverwcolormap(x',y',u',v',scale,'bounds',[0 10]),jet) with the data from the example I posted, it looks all right though, but that might not be your problem. Normally when I call this program to plot over another image I just use "hold on". Sorry I can't be of more help - I hope you figure it out!

24 May 2013 sundar

When I use quiverwcolorbar, I get a very nice colored velocity field from blue to red, using the jet colormap. My velocity range is between 0 and 13 um/min.
When I use imshow to display my image and then call this function, the colorbar is totally weird and it is only blue in color (ranging from 0 to 13 um/min) even though the velocities are colored blue to red.

I do not know what I should change?

Any help will be awesome.

24 Apr 2013 Melissa Day

FYI to everyone, I had a similar problem with http://www.mathworks.com/matlabcentral/fileexchange/7180-quiverc2wcmap and had to add "view([0,-90]);" after I called the plot for it to look right (after doing a clear all), so if anyone is having trouble with this maybe playing with the view will help.

17 Apr 2013 Travis Miles

For some reason this is flipping my y-axis and image from increasing to decreasing...

Updates
12 Feb 2013
12 Feb 2013

Fixed some typos, added bit in case min(xyuvvrNNs) < colormin

12 Feb 2013

changed spacing in description

14 Feb 2013

Fixed some typos, added bit in case min(xyuvvrNNs) < colormin

24 May 2013

Minor typo fixes

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