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

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)

[Chunru]

Attach your data.

[Yashvardhan Bhati]

File size is too big to be attached. Do you need any specific information ?

[Chunru]

Then a portion of data enough for demonstrating the code.

[Yashvardhan Bhati]

Please check if the file is sufficient or not.

Answer 1

[Chunru]

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)

[Yashvardhan Bhati]

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.

[Chunru]

Specifies the levels:

contourf(x0, y0, zq, levels)  % where levels is the chosen levels