how can I plot a cartesian grid grid of 100*30 size with stretching in matlab

Is that code correct ? also

close all;
clc;
Mi=0.5;
T=300;
P=1;
gamma = 1.4;
R=287;
vinf = sqrt(gamma*R*T)*Mi;
Nx = 100; % x dimension
Ny = 30; % y dimension
Nxy= Nx*Ny;
% step sizes
dx = 1;
dy = 1;
x = 1:dx:Nx; % x axis
y = 1:dy:Ny; % y axis
 
%set grid location
for j=1:Ny
    for i=1:Nx
        x(i)=single(i-1)*dx;
        y(j)=single(j-1)*dy;
    end
end

Answer 1

[Ameer Hamza]

I guess you want something like this

[x,y] = meshgrid(1:100, 1:30);

[Amal Fennich]

I did not give me the grid

[Ameer Hamza]

What is the values of x and y.

[Ameer Hamza]

Can you show, in which format do you want the grid.

[Amal Fennich]

Nx = 100; % x dimension

Ny = 30; % y dimension

Nxy= Nx*Ny;

% step sizes

dx = 1;

dy = 1;

x = 1:dx:Nx; % x axis

y = 1:dy:Ny; % y axis

% PLOT ARC

circx= linspace(0,1,40);

circy= sqrt(8.35^2 - (circx-.5).^2)-8.335;

plot(circx, circy) % Draw An Arc

axis([-0.5 1.5 -.1 .1]) % Set Axis Limits

hold on;

[xx,yy]=meshgrid(x,y); %develop grid based on 2 (x and y) arrays of different size

z=zeros(size(xx)); %generate z as a matrix of zeros (same size as meshgrid)

pcolor(xx,yy,z); %plots the 3 dimensions as a '2d plot' of meshgrid at z=0

% view(1) %changes the 3d default view to a 2d for xy plane

xlim([1 100])

ylim([1 30])

hold off ;