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Oct 30, 2010, 04:05 PM  #1 
Plotting a stream function in matlab
How does one do this?
I am trying to plot PSI = Acos(6x)Uy where A=1 and U=1 over an x range of 2000200 and y from 20002000 My code is this and it is giving me an error. x = 2000:1:2000; y = 2000:1:2000; si = zeros(x,y); for x = 2000:1:2000 for y = 2000:1:2000 si(x,y) = cos(6*x)y; end end plot(si) Thanks for any help 

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Oct 30, 2010, 04:55 PM  #2 
What is the error?
I am not sure what you are trying to do here. Are you trying to make a 3D graph of cos(6*x)  y over x = [2000,2000] and y = [2000,2000] ? 

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Oct 30, 2010, 05:28 PM  #3  
Quote:
Quote:
Something that looks like this http://upload.wikimedia.org/wikipedi..._mass_plot.png 

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Oct 31, 2010, 08:20 AM  #4  
I never used Matlab, but from the error description
Quote:
for x = 0:1:4000 for y = 0:1:4000 si(x,y) = cos(6*(x2000))(y2000);
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Oct 31, 2010, 01:03 PM  #5 
In MATLAB arrays always have a lower bound of 1. Your for loops have to be adjusted. Also I think contour() is more suitable instead of plot(). Then you can specify the x and yaxis units.
crackpip 

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