Visualization using Matlab

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 November 9, 2001, 19:25 Visualization using Matlab #1 Chan Keen Ian Guest   Posts: n/a Hi, I have just started using Matlab as a tool for plotting results generated by a CFD code written in Fortran. May I know if anyone has scripts for generating contour plots of quantities like Mach number, pressure and so on? Please advice as to how the external data file generated by the CFD code should structure the flow quantities. Thanks very much, Chan K I

 November 9, 2001, 23:21 Re: Visualization using Matlab #2 Paul Guest   Posts: n/a Matlab has enormous online documents for the plotting of quiver(velocity vector), contours and other things. I have some examples if you need them.

 November 10, 2001, 04:07 Re: Visualization using Matlab #3 ryan Guest   Posts: n/a Hi Could you send the matlab examples to me ? Many thanks..

 November 10, 2001, 07:34 Re: Visualization using Matlab #4 Junseok Kim Guest   Posts: n/a You can use help command at matlab, type >> help contour CONTOUR Contour plot. CONTOUR(Z) is a contour plot of matrix Z treating the values in Z as heights above a plane. A contour plot are the level curves of Z for some values V. The values V are chosen automatically. CONTOUR(X,Y,Z) X and Y specify the (x,y) coordinates of the surface as for SURF. CONTOUR(Z,N) and CONTOUR(X,Y,Z,N) draw N contour lines, overriding the automatic value. CONTOUR(Z,V) and CONTOUR(X,Y,Z,V) draw LENGTH(V) contour lines at the values specified in vector V. Use CONTOUR(Z,[v v]) or CONTOUR(X,Y,Z,[v v]) to compute a single contour at the level v. [C,H] = CONTOUR(...) returns contour matrix C as described in CONTOURC and a column vector H of handles to LINE or PATCH objects, one handle per line. Both of these can be used as input to CLABEL. The UserData property of each object contains the height value for each contour. The contours are normally colored based on the current colormap and are drawn as PATCH objects. You can override this behavior with the syntax CONTOUR(...,'LINESPEC') to draw the contours as LINE objects with the color and linetype specified. Uses code by R. Pawlowicz to handle parametric surfaces and inline contour labels. Example: [c,h] = contour(peaks); clabel(c,h), colorbar See also CONTOUR3, CONTOURF, CLABEL, COLORBAR. If you want to know more details, just ask me. Junseok

 November 10, 2001, 09:13 Re: Visualization using Matlab #5 Chan Keen Ian Guest   Posts: n/a Hi, Thanks very much for the advice. Paul: Would it be OK to send me examples of Matlab contour plotting? Suppose I had a 3-D H-grid of turbomachinery blade passage, does Matlab have any features to plot and visualize the grid? Regards

 November 10, 2001, 11:47 Re: Visualization using Matlab #6 dia Guest   Posts: n/a would you please e-mail me your examples. thanks in advance.

 November 10, 2001, 21:08 Re: Visualization using Matlab #7 yfyap Guest   Posts: n/a dear Kim, how do we plot the velocity vetors for, let's say, a two dimensional plot, given the x and y of the velocity components are known? if these data is in text file, then, is it possible to import them into matlab? thanks. regards, yfyap

 November 10, 2001, 21:21 Re: Visualization using Matlab #8 Junseok Kim Guest   Posts: n/a Okay, first of all, you can check quiver command at matlab. >> help quiver And about the your question, you can save velocity files such as u and v, for example, save u velocity field in a file name u.m and file content is A=[1 2 3 4 5 6 7 8 9]; and in another file, say v.m put contents like this B=[1 3 2 5 7 6 7 9 8]; Then, surely these files are on the working directory. There are two ways which you can import these data by typing :> u and then >> v then you can check they are loaded or not by typing >> whos you will see >> u :> v :> whos Name Size Bytes Class A 3x3 72 double array B 3x3 72 double array Grand total is 18 elements using 144 bytes Now use quiver command, like this >> quiver(A,B) And the other way is make another file, and put above commands in that file, and run that file. Junseok

 November 10, 2001, 21:24 p.s. #9 Junseok Kim Guest   Posts: n/a A=[1 2 3 4 5 6 7 8 9]; B=[1 3 2 5 7 6 7 9 8]; These should be A=[1 2 3; 4 5 6; 7 8 9]; B=[1 3 2; 5 7 6; 7 9 8];

 November 11, 2001, 09:41 Re: p.s. #10 yfyap Guest   Posts: n/a thanks a lot, got the plot already. for contour plot, i have tried the following, but the contour line won't appear. note z is the height : x=[ elements of x] y=[ elements of y] z=[ elements of z] contour(x,y,z) thanks agian. regards, yfyap

 November 11, 2001, 09:51 Re: p.s. #11 Junseok Kim Guest   Posts: n/a The basic idea is you should use matrix not vector for height z on x and y coordinate, clear x=[1 2 3 4 5]; y=[1 2 3 4 5]; z=[5 2 3 8 9; 1 3 4 12 4;8 8 6 5 5; 6 98 5 8 9; 86 0 75 98 7]; contour(x,y,z) and try contourf, it is cool. contourf(x,y,z)

 November 13, 2001, 13:03 Re: Visualization using Matlab #12 pran Guest   Posts: n/a I 've developed a code for solving 3 D free convection in box and written in fortran. Three dimensional plotting (temperature, pressure and velocity vectors) are generated by using Matlab. If you're interested, I'll send you my codes (*.for & *.m) for you.

 November 13, 2001, 15:55 Re: Visualization using Matlab #13 Chan Keen Ian Guest   Posts: n/a Hi Pran, Yes, I'm interested in your codes. May I have a copy of the fortran and matlab codes? Thanks very much, Chan K I

 November 29, 2001, 15:15 Re: Visualization using Matlab #14 Nassar Guest   Posts: n/a Hi Could you send the matlab examples to me ? Many thanks..

 December 30, 2010, 08:39 #15 New Member   Join Date: Dec 2010 Posts: 5 Rep Power: 6 Hi could you send me the examples, i have no idea where to start thanks

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