How to put in color a certain part of the background in a plot with matlab?

Question

I would like to draw in grey color a certain part of the background in a plot. I know how to change the background color of the whole plot.I used this code after the plot function:

HANDLE = gca

get( HANDLE );

set( HANDLE, 'Color', [0.7,0.7,0.7] )

Exemple: y=x^2

How can I do to draw the blue part of the background in grey and to leave the other parts in white?

Thank you in advance

Answer 1

You can always draw a filled 2D rectangle with the desired color:

rectangle('Position',[-5,400,10,400],'FaceColor',[0.7,0.7,0.7])

So:

1. Put your background in white
2. Draw the gray rectangle
3. Finally draw the curve.