MATLAB: Make two groups of data from a given data set

data acquisitiondata grouping

Hi,

I want to separate some specific data from a given data set. Suppose I have data set r i.e.

r = randi(99,1,500);

I want to make two groups of data based on following conditions

if r<=30 make group 1 (store them in an array)

if r>=35 make group 2 (store them in an array)

Any help in this regard will be highly appreciated.

Just use logical indexing. Suppose you have a variable A that you want to group based on the values in r.

B{1}=A(r<=35);
B{2}=A(r>35);

Now you have split the array A and stored the sets in a cell array B. Of course, you can replace A by r, if r is the array you want to group.

Note that your signs were inconsistent.

If you have R2015a or later, the discretize funciton may do what you want:

group   = discretize(R, [0 10 20 30]);

The function you want to use is called intlut() and it's in the Image Processing Toolbox. It's fast and is just a single line of code.

new_R = intlut(R, A);