Background color of part of figure

%Objective Function --> 8*X1 + 10*X2 + 4
%Constrait 1        --> X1 - X2 >= -4
%Constrait 2        --> X1 + X2 <=  6

%Boundary Conditions --> X1,X2 >= 0

%%
%Graphical Method
X1=-5:5;
X2=-5:5;
[x,y]=meshgrid(X1,X2);
   z=8*x+10*y+4;
   figure
  contour(x,y,z);
     [C,h]=contour(x,y,z,17);hold on;
   clabel(C,h);
   plot(X1,X2-4,'r');hold on;
   plot(X1,6-X2,'b');hold on;
   plot(X1,zeros(1,length(X2)),'k');hold on;
   plot(zeros(1,length(X1)),X2,'k');
   axis([-5 5 -5 5])

Hi everyone

I want to change the background color of part of the graph is shown above. The part of the graph is between four lines, that are x>0,y>0 , x-y>-4 and x+y<6. If you could help me I would be very grateful.

Answer 1

[Image Analyst]

Add this:

% Make the background yellow.
ax = gca
ax.Color = 'y';

Alternatively you can specify an RGB color in the range 0-1, like for cyan:

% Make the background yellow.
ax = gca
ax.Color = [0, 1, 1];

[IBRAHIM BOZTAS]

Thank you but it makes the background of the whole graph yellow. I just want to change the background color of part of the graph.