Matlab plots coloring area - matlab-figure

Question

I'm working on this code to get liner power consumption result :
P_out = 0:100;
Po= 130 ;
dP= 4.7 ;
N_TRX=6;
P_max= 20;
p_sleep= 75;
if 0< P_out <= P_max
P = N_TRX*Po+N_TRX*dP*P_out;
else
P=N_TRX* p_sleep;
end
%%%%%
Po= 130 ;
dP= 2.8 ;
N_TRX=6;
P_max= 40;
if 0< P_out <= P_max
P1= N_TRX*Po+N_TRX*dP*P_out;
else
P1=N_TRX* p_sleep;
end
%%%%%
Po= 130 ;
dP= 5.9 ;
N_TRX=2;
P_max= 20;
if 0< P_out <= P_max
P2= N_TRX*(Po+dP*P_out);
else
P_in2=N_TRX* p_sleep;
end
%%%%%
Po= 110 ;
dP= 4.2;
N_TRX=6;
P_max= 20;
if 0< P_out <= P_max_macro
P3= N_TRX*Po+N_TRX*dP*P_out;
else
P3=N_TRX* p_sleep;
end
figure, plot(P_out,P,'b'); hold on, plot(P_out,P1,'g'); hold on, plot(P_out,P2,'r'); hold on,plot (P_out,P3,'y'),hold off
The plot is here:
and I want to fill the area between the lines with colors to get 4 areas colored with its line color.

Answer 1

Here is a way to do this using the area function:
h = area(P_out,[P2;P1-P2;P3-P1;P-P3].');
h(1).FaceColor = 'r';
h(2).FaceColor = 'g';
h(3).FaceColor = 'y';
h(4).FaceColor = 'b';
Which will give you this:
you can also use some nicer colors and transparency:
ax = axes;
col = mat2cell(lines(4),ones(4,1),3);
hold on
h(1) = area(ax,P_out,P);
h(4) = area(ax,P_out,P3);
h(2) = area(ax,P_out,P1);
h(3) = area(ax,P_out,P2);
set(h,{'FaceColor'},col)
set(h,'FaceAlpha',0.6)
hold off
to get this: