Contour Plotting form the text file for x and y coordinates values

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Yashvardhan Bhati
Yashvardhan Bhati 2022-8-22
评论： Chunru 2022-8-22
I have a text file whcih contains the data for the x and y coordinates and for each coordinate i have vx,vy, and other quantities. I would like to have spatial plot or contour. I tried using contour f plot but it says Z must be 2*2 matrix whcih i dont understand as Z here is my data of velocity.
Below is how my entires look like.
XC,YC,VX,VY,Omegaz,NP
-51.0,3.0,0.0,0.0,0.0,0.0
-51.0,3.25,0.0,0.0,0.0,0.0
-51.0,3.5,0.0,0.0,0.0,0.0
-51.0,3.75,0.0,0.0,0.0,0.0
-51.0,4.0,0.0,0.0,0.0,0.0
-51.0,4.25,0.0,0.0,0.0,0.0
can you help me with the how to proceed with it. This is what i have bene trying to do.
A1=readtable('Plug.txt','ReadVariableNames',true);
AA1=table2array(A1);
X1=AA1(1:1378,1);
Y1=AA1(1:1378,2);
VY1=AA1(1:1378,4);
contourf(X1,Y1,VY1)
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Chunru
Chunru 2022-8-22
Ran in:
T = readtable("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1103995/Plug%20-%20Copy.txt")
T = 54245×6 table
XC YC VX VY Omegaz NP ___ ____ ___________ ___________ _______ _____ -50 6 -1.9191e-06 2.2662e-05 0.77066 46022 -50 6.25 -1.9191e-06 2.2662e-05 0.77066 46022 -50 6.5 -1.9191e-06 2.2662e-05 0.77066 46022 -50 6.75 -1.9191e-06 2.2662e-05 0.77066 46022 -50 7 1.2339e-05 -1.805e-06 0.67463 50001 -50 7.25 1.2339e-05 -1.805e-06 0.67463 50001 -50 7.5 1.2339e-05 -1.805e-06 0.67463 50001 -50 7.75 1.2339e-05 -1.805e-06 0.67463 50001 -50 8 1.5834e-08 -4.2745e-06 0.74742 50001 -50 8.25 1.5834e-08 -4.2745e-06 0.74742 50001 -50 8.5 1.5834e-08 -4.2745e-06 0.74742 50001 -50 8.75 1.5834e-08 -4.2745e-06 0.74742 50001 -50 9 1.3008e-05 -4.0343e-05 0.77883 45183 -50 9.25 1.3008e-05 -4.0343e-05 0.77883 45183 -50 9.5 1.3008e-05 -4.0343e-05 0.77883 45183 -50 9.75 1.3008e-05 -4.0343e-05 0.77883 45183
F = scatteredInterpolant(T.XC, T.YC, T.VY);
[xmin, xmax] = bounds(T.XC);
[ymin, ymax] = bounds(T.YC);
x0 = linspace(xmin, xmax, 50);
y0 = linspace(ymin, ymax, 50);
[xq, yq] = meshgrid(x0, y0);
zq = F(xq, yq);
contourf(x0, y0, zq)
  2 个评论
Yashvardhan Bhati
Yashvardhan Bhati 2022-8-22
Well this works well, Thanks. but how do i get the Coutour legend and is there any way to make the contour plot more coarse or refine based on requirement.

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