How can I create contour for velocity?

Question

mohammad pourtousi 2013-5-15

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Hello;

I want to contour velocity field . This velocity field has one column for X , one column for Y and one column for velocity values. How can I contour this matrix?

The Matrix is written such as following:

 X [ m ]   Y [ m ]   Velocity v.Gradient
-7.70E-02  2.56E+00  2.15E+00
-7.14E-02  2.56E+00  1.86E+00
-4.05E-03  2.56E+00  1.70E+00
1.69E-02  2.56E+00  1.61E+00
2.20E-02  2.56E+00  1.66E+00
-2.65E-03  2.56E+00  1.63E+00
1.41E-04  2.56E+00  1.64E+00
-4.81E-03  2.56E+00  1.62E+00
-7.40E-03  2.56E+00  1.77E+00
-8.48E-03  2.56E+00  1.69E+00
-1.51E-04  2.56E+00  1.62E+00
-1.09E-02  2.56E+00  1.69E+00
-1.59E-02  2.56E+00  1.74E+00
-1.53E-02  2.56E+00  1.79E+00
-9.46E-04  2.56E+00  1.67E+00
4.61E-03  2.56E+00  1.66E+00
-1.30E-02  2.56E+00  1.69E+00
-1.61E-02  2.56E+00  1.69E+00
-1.95E-02  2.56E+00  1.71E+00
-2.14E-02  2.56E+00  1.76E+00
-2.17E-02  2.56E+00  1.74E+00
-1.88E-02  2.56E+00  1.73E+00
-1.48E-02  2.56E+00  1.72E+00
-1.15E-02  2.56E+00  1.72E+00
-8.58E-03  2.56E+00  1.71E+00
-5.87E-03  2.56E+00  1.66E+00
-4.11E-03  2.56E+00  1.60E+00
-1.65E-03  2.56E+00  1.69E+00
5.50E-04  2.56E+00  1.64E+00
3.47E-03  2.56E+00  1.73E+00
5.01E-03  2.56E+00  1.72E+00
9.80E-03  2.56E+00  1.60E+00
1.39E-02  2.56E+00  1.74E+00
1.42E-02  2.56E+00  1.53E+00
1.93E-02  2.56E+00  1.59E+00
9.24E-03  2.56E+00  1.67E+00
-7.32E-04  2.56E+00  1.68E+00
-1.06E-02  2.56E+00  1.68E+00
-2.23E-02  2.56E+00  1.69E+00
-2.41E-02  2.56E+00  1.70E+00
-2.55E-02  2.56E+00  1.71E+00
-2.62E-02  2.56E+00  1.72E+00
-2.51E-02  2.56E+00  1.72E+00
-2.21E-02  2.56E+00  1.73E+00
-1.84E-02  2.56E+00  1.72E+00
-1.49E-02  2.56E+00  1.72E+00
-1.14E-02  2.56E+00  1.71E+00
-7.93E-03  2.56E+00  1.74E+00
-4.25E-03  2.56E+00  1.73E+00
-6.31E-05  2.56E+00  1.68E+00
3.58E-03  2.56E+00  1.67E+00
6.86E-03  2.56E+00  1.70E+00
9.80E-03  2.56E+00  1.66E+00
1.25E-02  2.56E+00  1.64E+00
1.59E-02  2.56E+00  1.67E+00
1.93E-02  2.56E+00  1.71E+00
2.16E-02  2.56E+00  1.62E+00
2.44E-02  2.56E+00  1.57E+00
2.82E-02  2.56E+00  1.62E+00
3.12E-02  2.56E+00  1.66E+00
2.92E-02  2.56E+00  1.58E+00
2.79E-02  2.56E+00  1.59E+00
2.79E-02  2.56E+00  1.57E+00
-3.18E-02  2.56E+00  1.72E+00
-3.17E-02  2.56E+00  1.71E+00
-3.16E-02  2.56E+00  1.69E+00
1.98E-02  2.56E+00  1.62E+00
1.90E-03  2.56E+00  1.67E+00
-7.86E-03  2.56E+00  1.66E+00
-2.07E-02  2.56E+00  1.67E+00
-3.11E-02  2.56E+00  1.67E+00
-3.10E-02  2.56E+00  1.74E+00
-2.88E-02  2.56E+00  1.75E+00
With best regards

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Answer 1

Stephan M. H. 2013-5-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75874-how-can-i-create-contour-for-velocity#answer_85532

编辑：Stephan M. H. 2013-5-15

在 MATLAB Online 中打开

Hello Mohammad,

if I understand your question correctly, it doesn't make much sense to draw a contour plot for your data, since the y component is always the same. You can't get more info out of this data then a simple plot could show you

If 'D' is your matrix, just do

plot(D(:,1),D(:,3),'*')

If you still want to do a contour plot look up the contour documentation

best,

Stephan

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Answer 2

mohammad pourtousi 2013-5-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75874-how-can-i-create-contour-for-velocity#answer_85535

Thank you Stephan

ACtually this filw is small part of the exact file and the y is changing .let me upload the exat file

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Stephan M. H. 2013-5-15

I think it would be better if you describe your problem in a general form instead of posting a huge file or matrix. Important would be, e.g., if you know the (x,y) data points or get velocity samples at random locations?

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