How to plot contour?

Can anyone help me to suggest a coding to plot pressure contour for this pressure values.

x = [-4.2195;
-5.7195;
-7.2195;
-8.7195;
-2.7195;
-4.2195;
-5.7195;
-7.2195;
-8.7195;
-1.2195;
-2.7195;
-4.2195;
-5.7195;
-7.2195;
-8.7195];
y = [6.3;
6.3;
6.3;
6.3;
4;
4;
4;
4;
4;
1.7;
1.7;
1.7;
1.7;
1.7;
1.7];
pressure = [0.007102637;
0.006237111;
0.003838996;
0.003957271;
0.010614624;
0.005477081;
0.004232522;
0.004189709;
0.003693549;
0.008519338;
0.005573828;
0.003937382;
0.004821263;
0.004177716;
0.004030966];

Answer 1

[Voss]

x = [-4.2195;
-5.7195;
-7.2195;
-8.7195;
-2.7195;
-4.2195;
-5.7195;
-7.2195;
-8.7195;
-1.2195;
-2.7195;
-4.2195;
-5.7195;
-7.2195;
-8.7195];
y = [6.3;
6.3;
6.3;
6.3;
4;
4;
4;
4;
4;
1.7;
1.7;
1.7;
1.7;
1.7;
1.7];
pressure = [0.007102637;
0.006237111;
0.003838996;
0.003957271;
0.010614624;
0.005477081;
0.004232522;
0.004189709;
0.003693549;
0.008519338;
0.005573828;
0.003937382;
0.004821263;
0.004177716;
0.004030966];

I = scatteredInterpolant(x,y,pressure);
[X,Y] = meshgrid(unique(x),unique(y));
contour(X,Y,I(X,Y))
colorbar()

Answer 2

[Walter Roberson]

look in the File Exchange for scattered contour

Answer 3

[Star Strider]

Another option would be contour3 —

% Make x-y mesh grid
x = [-4.2195;
    -5.7195;
    -7.2195;
    -8.7195;
    -2.7195;
    -4.2195;
    -5.7195;
    -7.2195;
    -8.7195;
    -1.2195;
    -2.7195;
    -4.2195;
    -5.7195;
    -7.2195;
    -8.7195];
y = [6.3;
    6.3;
    6.3;
    6.3;
    4;
    4;
    4;
    4;
    4;
    1.7;
    1.7;
    1.7;
    1.7;
    1.7;
    1.7];
pressure = [0.007102637;
    0.006237111;
    0.003838996;
    0.003957271;
    0.010614624;
    0.005477081;
    0.004232522;
    0.004189709;
    0.003693549;
    0.008519338;
    0.005573828;
    0.003937382;
    0.004821263;
    0.004177716;
    0.004030966];
[xq,yq] = meshgrid(...
    linspace(min(x),max(x),170),...
    linspace(min(y),max(y),170)); 
% Interpolate using "griddata" function
pq = griddata(x,y,pressure,xq,yq,'cubic');
% Visualize the result
figure
hsc = surfc(xq,yq,pq, 'EdgeColor','none');
hold on
[~,hc3] = contour3(xq,yq,pq, 10, '-k', 'ShowText','on');                    % Draw 10 Contours ('ShowText' Is Optional)
Lvls = hc3.LevelList;
hsc(2).LevelList = Lvls;                                                    % Match The 'surfc' Contours With The 'contour3' Contours
hold off
xlabel('x','FontSize',16)
ylabel('y','FontSize',16)
c = colorbar;
c.Label.String = 'Cp';
c.Label.FontSize = 16;
c.Limits = [0 0.011];