check the condition and assign discrete values

i have converted one dataset into four groups.say my datavalues are in between 0 to 1.

Then i seperated those values as <0.25 ,<0.5 ,<0.75,<1

now i want to assign 0.25 group as value 0, 0.5 group as 1 0.75 group as 2 1 group as 3

can anybody help in this?

Answer 1

[Azzi Abdelmalek]

x=rand(1,100)
[idx,idx]=histc(x,[0.25 0.5 0.75 1])
for k=1:4
  groupe{k}=x(idx==k-1)
end

[subha]

I used quartile method.Also i found probability for each quartile.Now i want to replace each quartile state to 0,1 ,2 ,3 respectively.I didnt use any cell array type

can you give me idea in this case

thanks

Answer 2

[Image Analyst]

If you have the Image Processing Toolbox, you could use imquantize().