Doug's MATLAB Video Tutorials

November 20th, 2009

I like his slow, clear, methodical presentation with great visualizations. It is the first time I have deeply understood some of the volume visualization techniques we have.

• 1 of 9 Definitions for scalar and vector fields.
• 2 of 9 Examples of scalar and vector fields (temperature in a room vs air currents)
• 3 of 9 Displays scatter3 and slice plots.
• 4 of 9 Displays contourslice and isosurface.
• 5 of 9 Making a 3-d plot ‘pretty’ with lighting, shading, interpolation, etc…
• 6 of 9 Displays quiver3 and coneplot
• 7 of 9 Displays and explains streamplot and streamslice
• 8 of 9 Displays and explains streamtubes and streamribbons
• 9 of 9 Unifying example

19:48 UTC | Posted in Format: Video, Level: Basic | Permalink | 6 Comments »

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6 Responses to “Basics: Volume visualization: 6/9 Displays quiver3 and coneplot”

1. Alex Knight replied on November 25th, 2009 at 09:44 UTC :
   

   Hi,

   these videos are great – but I find this one stops playing every time at 2:00. The others have all played just fine. (Windows XP/ Google Chrome).

   Alex

2. dhull replied on November 25th, 2009 at 14:31 UTC :
   

   @Alex

   Thanks for the kind words. I was unable to reproduce the error. Please try again.

   Thanks,
   Doug

3. Nilotpal replied on November 27th, 2009 at 23:14 UTC :
   

   Hi, great videos. I’m having a trouble getting the correct output for the code snippet as on 4:05. have implemented just the following code on editor as shown here:

   [x, y, z]=meshgrid(-1.5:0.1:1.5);
   u=x+cos(4*x)+3;
   v=sin(4*x)-sin(2*y);
   w=-z;
   [cx, cy, cz]=meshgrid([-1 0 1]);
   coneplot(x, y, z, u, v, w, cx, cy, cz);
   

   but i ended up getting just a 2D plot in black and white with -1.5 to 1.5 on both axes. nd the cones are plotted inside this 2D plot. Am i doing something wrong or missing something? do i have to add something to this code?

4. Daniel Armyr replied on November 30th, 2009 at 12:01 UTC :
   

   @Nilotpal:
   You are correct. The code in this presentation seems to only hilight the most important functions. The person making the presentation has obviously spent significant time prettifying the plots but not published the code for that.

   To get a view similar to the one in the movie, type:

   >>view(3)

5. Daniel Armyr replied on November 30th, 2009 at 12:13 UTC :
   

   OK, seriously guys….
   When I run the code below, I get polka-striped pink cones. That was not expected….

   [x, y, z]=meshgrid(-1.5:0.5:1.5);
   u=x+cos(4*x)+3;
   v=sin(4*x)-sin(2*y);
   w=-z;
   [cx, cy, cz]=meshgrid([-1 0 1]);
   c = sqrt(u.^2+v.^2);
   h = coneplot(x, y, z, u, v, w, cx, cy, cz, c);
   view(-150,20);
   set( h, ‘EdgeColor’, ‘none’ );
   camlight(‘left’);

6. dhull replied on November 30th, 2009 at 15:08 UTC :
   

   @Daniel,

   Weird. I just copy pasted your code, and it was all fine.
   Still happening for you?

   Doug

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<pre class="code">
a = magic(3);
sum(a)
</pre>

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