MATLAB: How to fill a colour in the area surrounded by lines, X &Yaxis and a curve

colourcurvefillplot

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x = [0 50 50] ;
y = [100 100 150] ;
%%Add cooridnates for closing the given points in anti clockwise direction 
xi = [50 150 150 0 0] ;
yi = [150 150 0 0 100] ;
xx = [x xi] ;
yy = [y yi] ;
plot(xx,yy)
patch(xx,yy,'r')

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MATLAB: Surf plot using meshgrid

As z is an array, the following two statements

if z<100

and

elseif z>=100 & z<200

will only be true if every element within z satisfies the conditions, so you always end up with the third result (k=z-100).

To apply the if elseif statements to every element within z, try

x=0:300;
y=x;
[xx,yy]=meshgrid(x,y);
z=(xx+yy)/2;
figure
surf(x,y,z,'EdgeColor','none')
k = z;
k(z>=100) = z(z>=100)-100;
k(z>=100&z<200) = 100;
figure
surf(x,y,k,'EdgeColor','none')

MATLAB: How to surround the homogeneous pixels

You can use stdfilt() and conv2() and bwboundaries().

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Related Solutions

MATLAB: Surf plot using meshgrid

MATLAB: How to surround the homogeneous pixels

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