read data to plot
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Hello, I'm trying to read the data in the zip file attached with this code but I'm getting errors, not sure how I could plot the data contained in this file? any help will be greatly appreciated. Thanks
clear;
clc;
nx=225;ny=66;nfields=9;
a=readmatrix('NACA4612_1E-4_225x66.XYZ_M=0.5_ALPHA_2.0_Turbulent.dat','Headerlines',5)';
b=reshape(a(1:nx*ny*2),[nx,ny,2]);
x=b(:,:,1);y=b(:,:,2);
%centroids (improve this by averaging the 4 corners)
xc=x(1:end-1,1:end-1)+diff(x(:,1:end-1))/2 +diff(x(1:end-1,:),[],2)/2;
yc=y(1:end-1,1:end-1)+diff(y(:,1:end-1))/2 +diff(y(1:end-1,:),[],2)/2;
b=reshape(a(nx*ny*2+1:end),[nx-1,ny-1,nfields]);%nine dependent variables
%plot pressure
figure;surf(xc,yc,b(:,:,4));
view(2);shading flat;axis image;axis([-1,1,-1,1])
5 个评论
Cris LaPierre
2023-5-4
Sure. Can you provide the values of nx, ny, and nfields at this point in your code?
回答(1 个)
Debraj Maji
2023-11-14
I see that you are trying to read data form a file with a .DAT extension. I have downloaded the zip file shared and upon inspection have found that there is a mismatch in the file name used for reading the file. You can find the required correction below:
a=readmatrix('NACA4512_1E-4_225x66.XYZ_M=0.5_ALPHA_2.0_TURBULENT.dat','Headerlines',5)';
The corresponding figure obtained using the shared data is attached below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1539097/image.png)
Make sure to add the path for the data file is added before the script is run.
I hope this helps!
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