How to plot heatmap using x y and z data

Hi i am trying to create a heat map using x, y, and z data where x , y is the coordinates and z is the measured value. I have tried using heatmap command however i am not getting my desired outcome. Any help is appreciated. Thank you

 tbl = table(x,y,z)
 h = heatmap(tbl,'x','y','ColorVariable','z')
   
   

Answer 1

[Simon Chan]

You may refer to the following example to make sure your variable x,y and z are in similar format.

xcoord = 1.5:0.1:3;                 % x-coordinates from 1.5 to 3.0
ycoord = 2:0.1:5;                   % y-coordinates from 2.0 to 5.0
[X,Y] = meshgrid(xcoord,ycoord);
zdata = randi([5 30], numel(xcoord),numel(ycoord));     % Simulate the data
x = X(:);                                       % Your varaible x should something like this as a column vector
y = Y(:);                                       % Similar for variable y
z = zdata(:);                                   % Similar for variable z
tbl = table(x,y,z);                             % Combine them in a table
h = heatmap(tbl,'x','y','ColorVariable','z');   % Generate heat map