MATLAB: How do i expand this figure so all graphs fit perfect

Question

Answer 1

Instead of using subplot(2,2,1), try this

figure
axes('position',[0 .5 .5 .5])
plot(1:10,1:10,'b') 
axes('position',[.5 .5 .5 .5])
plot(1:10,1:10,'r') 
axes('position',[0 0 .5 .5])
plot(1:10,1:10,'k') 
axes('position',[.5 0 .5 .5])
plot(1:10,1:10,'m')