How can I divide square area to sub areas?

I have square area 100*100

I need to divide it to 3 sub areas.

I tried to write this code but there is an error:

R1=[];
R2=[];
R3=[];
for i=0:1:15
	i (0<BSy(i)<=200/3)
	%%region 1 from 0:200/3
	R1=[R1 i];
	elseif (200/3<BSy(i)<=200*2/3)
		%%region 2 from 200/3:2*200/3
		R2=[R2 i];
		R3=[R3 i];
end
end

Answer 1

[Image Analyst]

Use "if" instead of "i" and change the logical test. This:

i (0<BSy(i)<=200/3)

should be this:

if (0 < BSy(i)) && (BSy(i) <= 200 / 3)