How to do a heat map ( color the surface) in a 2D plot ?

Hello,

I have 3 parameters, x, y and z. And I would like to represent z as a colored surface like in the picture.

Here is my code:

dataTG=xlsread('dataTG.xlsx');

IC50A=9456
IC50B=14.75
 X=((dataTG(:,2))./IC50A);
 Y=((dataTG(:,3))./IC50B);
 TT=(dataTG(:,2)./IC50A)+(dataTG(:,3)./IC50B)

z=(10.^((1-(X./TT)).*(1-(Y./TT)).*(0.78369.*(X./TT)+2.0178.*(Y./TT)-1.9924.*(X./TT).*(Y./TT)+4.7444.*(X./TT).*(Y./TT).*((X./TT)-(Y./TT)))));

   figure
   refline(-1,1)
   hold on
   pointsize = 10;
   scatter(X, Y, pointsize, z)
   colorbar()

Then, to do z as a colored surface, I tried :

   [X,Y] = meshgrid(X,Y);  
   surf(z,'EdgeColor','None');
   view(2);

but they say it does not work because 'Z must be a matrix, not a scalar or vector'.

Do you have have any idea ?

Thank you for your help.

Answer 1

[KSSV]

   [X,Y] = meshgrid(X,Y);  
   Z = repmat(z,1,length(x)) ;
   surf(X,Y,Z);
   shading interp 
   view(2);

Answer 2

[Walter Roberson]

 dataTG=xlsread('dataTG.xlsx');

 IC50A=9456
 IC50B=14.75
 x = ((dataTG(:,2))./IC50A);
 y = ((dataTG(:,3))./IC50B);
 [X, Y] = meshgrid(x, y);
 TT = (X./IC50A) + (y./IC50B);

 Z = (10.^((1-(X./TT)).*(1-(Y./TT)).*(0.78369.*(X./TT)+2.0178.*(Y./TT)-1.9924.*(X./TT).*(Y./TT)+4.7444.*(X./TT).*(Y./TT).*((X./TT)-(Y./TT)))));

   figure
   refline(-1,1)
   hold on
   pointsize = 10;
   surf(X, Y, Z, 'edgecolor', 'none');
   colorbar()