can anyone help me how to do rectangular curve fitting ? which function to use?

i have some data points on the graph and i want to fit a rectangular curve around it..

[KSSV]

What do you mean by a rectangular curve?

[L K]

please check the image i have attached, the dotted lines around the lines is what i mean by rectangular. Is it possible to do that in matlab?

[dpb]

Of course it is; as the demo I gave shows, you can draw a line or set of lines of any style anywhere you desire on the figure; all you've got to do is have a way to compute or otherwise divine the location of the line segment end points.

There is

doc rectangle

as well...

Answer 1

[dpb]

Taking a wild guess, perhaps the following simple demo will help..

N=50;  % arbitrary number points
x=randn(N,1); y=randn(size(x));  % and some even more arbitrary data
scatter(x,y,15,'k','filled');    % toss 'em around on an axis
minx=min(x); maxx=max(x);
miny=min(y); maxy=max(y);
pct=0.2; pLo=1-pct; pHi=1+pct;   % another arbitrary scaling factor
hL=line([pLo*minx;pHi*maxx;pHi*maxx;pLo*minx;pLo*minx],...
        [pLo*miny;pLo*miny;pHi*maxy;pHi*maxy;pHi*miny], ...
        'color','r')