MATLAB: Contour Plot from Coordinates

contourplot

Right now I have a matrix with x-coordinates, matrix with y-coordinates, and a matrix with pressure values at these points. I'm trying to create a pressure contour plot based on the pressure values at these points, but I cannot seem to figure it out. Could anyone point me in the right direction of how to accomplish this? Any help would be much appreciated!

Best Answer

I will assume you have three vectors: x, y, and z (where z represents pressure). For example

x = rand(1,100);
y = rand(1,100);
z = x.^2 + y.^2;

Then, you can try

[xi, yi] = meshgrid(...
    linspace(min(x),max(x)),...
    linspace(min(y),max(y)));
zi = griddata(x,y,z, xi,yi);
contour(xi,yi,zi)

Related Solutions

MATLAB: How to convert this to the filled 2-D contour plot

load dataset.mat
m = 100 ; n = 100 ; 
x = linspace(min(X),max(X),m) ; 
y = linspace(min(Y),max(Y),n) ; 
[Xi,Yi] = meshgrid(x,y) ; 
Zi = griddata(X,Y,Z,Xi,Yi) ; 
pcolor(Xi,Yi,Zi)
shading interp ;

MATLAB: Contour on a contourf plot

contourf gives you a colored plot. It fills the contour lines region with colors. To get whay you want use:

c = contour(Xi,Yi,Zi) ;

Now check, c has (x,y) coordinates. Now you can plot them using plot with required color.

plot(c(1,:),c(2,:),'k') ;

Or Striaght away, you can use contour ans specify the color.

contour(Xi,Yi,Zi,'k')

Best Answer

Related Solutions

MATLAB: How to convert this to the filled 2-D contour plot

MATLAB: Contour on a contourf plot

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