plot 2D gride

I want to plot a gride of pressure distribution in x and y direction

x=1:15;

y=1:15;

Pressure=Psave; (%matrix size (1125,1))

[Akira Agata]

Question for clarification:

Why the matrix size of the variable Pressure becomes 1125, instead of 225 (=15 x 15) ?

[Abdulrahman Mohamed]

sorry it is 225

Answer 1

[Voss]

x = 1:15;
y = 1:15;
% some 225x1 Pressure values:
Pressure = reshape(5000-abs(2*x-y.'),[],1);
size(Pressure)

ans = 1×2

225 1

% reshape Pressure to numel(y)-by-numel(x), 15x15.
% your reshape might have to be different, depending on how the order of
% the elements in Pressure relates to x and y
surface(x,y,reshape(Pressure,numel(y),[]));
cb = colorbar();
xlabel('x')
ylabel('y')
ylabel(cb,'Pressure')
title('Pressure')
axis tight