how to plot a 3d surface with a matrix

M=201x201 matrix of 400201 numbers, each number is a height

how to plot against x and z from x=10 to 30 with 0.1 increment and z from z=1 to 3 with 0.01 increment

3 Axis: x,z,height

M(1,1) will be plotted on x=10 and z= 1

M(1,2)will be plotted on x=10 and z= 1.001

M(1,2)will be plotted on x=10 and z= 1.002

M(2,1) will be plotted on x=10.1 and z= 1

Answer 1

[Star Strider]

Try this:

v = linspace(-2*pi, 2*pi, 201);                 % Create Data
[X,Y] = meshgrid(v);                            % Create Data
M = sin(X) + cos(Y);                            % Create Data

x = 10:0.1:30;
z = 1:0.01:3;

figure(1)
mesh(x, z, M)
grid on

Answer 2

[KL]

Something like this?

 x = 10:0.1:30;
z = 1:0.01:3;
[X,Z] = ndgrid(x,z);
mesh(X,Z,M)