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Home > Forums > Engineering Computer Programs > General Engineering Programs > MathWorks, Inc.: MATLAB Forum

3D surface plots(2)

Read More Threads Like This One

yaston4 (Mechanical)

30 Jun 12 17:55

I am really in need of some help please.

I am new to Matlab and I need to produce a 3D surface plot using the data in excel, can anyone help me. I have posted the excel data. I have plotted the surface plot in excel, but as you can see the surface plot is not very smooth and I believe Matlab can produce a smoother plot.

I don't mind using any other software that might achieve a smoother surface plot.

Thank-you

IRstuff (Aerospace)

30 Jun 12 18:29

Why not do the graph in Matlab?

Please refrain from double posting in the future.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies

yaston4 (Mechanical)

2 Jul 12 8:31

Thank you IRStuff and I apologise for the repeated post.

I have found a program on MATLAB central, which I think can help me with my problem. I wondered if anyone is having the same problem with it as I am. I open the MainGUI.m in MATLAB and run the code using (F5), but when the GUI pops up non of the GUI buttons seem to offer any commands.

http://www.mathworks.com/matlabcentral/fileexchang...

Sorry I am new to Matlab. Thanks.

LiteYear (Computer)

2 Jul 12 21:58

I think you're over-complicating this. Two Google searches and I've arrived at this solution:

1. Select the data (Z) values in Excel and copy them to the clipboard.

2. Enter the following in Matlab.
>> [X, Y] = meshgrid(-16:1:11, 1:1:19);
>> UIIMPORT('-pastespecial')

3. Ensure the data from Excel appears as necessary, then click Next and Finish.

4. Plot the result in Matlab using the following command.
>> surf(X, Y, A_pastespecial)

Is that what you're after?

The surf command has lots of options for changing the appearing. The mesh command might be what you want too. Check out the options here:

http://www.mathworks.com.au/help/techdoc/learn_mat...

There could be more elegant solutions too, but if quick and dirty is what you're after then I think you have it!

flash3780 (Mechanical)

17 Jul 12 10:44

There are lots of ways to create such a plot. I might fill in the empty cells with zeros and save the XLS file as a CSV file.
From there, you could do:

CODE

DATA = csvread('data1.csv');
x = DATA(2:20,1);
y = DATA(1,2:29);
[xx,yy]=meshgrid(x,y);
zz = DATA(2:20,2:29)';
surf(xx,yy,zz);
grid on; axis equal; colorbar;

http://files.engineering.com/getfile.aspx?folder=d0155fe1-ac59-46fc-bc94-5e

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