I want to use contourf function to plot 2d velocity data

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Mandar Kadwekar
Mandar Kadwekar 2022-7-13
评论： Mandar Kadwekar 2022-7-14
I have the x,y and corersponding velocity components u and v as a matrix data. I want to use this matrix data to plot a contour of velocity.
I went tried already using the Matlab database but I don't get epected results. It is hard to interpret the code given in the database, do if anyone can help to relate the code with the velocity data I have would be a big help.
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Mandar Kadwekar
Mandar Kadwekar 2022-7-13
Thanks for your reply,
can I apply contourf if I have a a total velocity magnitude matrix dpendent on X&Y. I want to produce results similar to the picture I have attached.
Star Strider
Star Strider 2022-7-13
Without the data themselves to work with, the only suggestion I have is to create a vector from ‘u’ and ‘v’ using the hypot function. It is relatively straightforward to interpolate ‘x’, ‘y’, and the resulting magnitude vector created by hypot to matrices to use with contourf.

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KSSV
KSSV 2022-7-13
Let u,v be your velcity matrices.
w = sqrt(u.^2+v.^2) ;
figure(1)
pcolor(x,y,w) ; % if throws error, transpose w
colorbar
shading interp
figure(2)
contourf(x,y,w)
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KSSV
KSSV 2022-7-14
It should show you arrow plots on pcolor. Attach your data and code.
Mandar Kadwekar
Mandar Kadwekar 2022-7-14
thanks for the help, I got the result now. I was just using wrong varaible.

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