Generating a normal distrbution random numbers and setting them to catagories

Hello,

Im very much new to matlab and would love help on this script.

I have to generate (n) amount of numbers, then set a,b and c to their catagories a is <-0.25 , b is >-0.25 and <=0.25 , c is >0.25

as well as find the sum of each catagories

function [a,b,c,Asum,Bsum,Csum]=random_gen(n)
a=0;
b=0;
c=0;
Asum=0;
Bsum=0;
Csum=0;
r=randn(1,n)
for n=1:n
    if r(n)<-0.25
       a=a+1
       Asum=Asum+r(n)
    elseif r(n)>=-0.25 && r(n)<=0.25
        b=b+1
        Bsum=Bsum+r(n)
    elseif r(n)>0.25
        c=c+1
        Csum=sum+r(n)
    end
end

[Image Analyst]

Exactly what does "set A,B and C to their catagories" mean? What are their categories? You're setting lower case a, b, and c all equal to r. MATLAB is case sensitive. Nowhere in your code do you set A, B, and C though you do set a, b, and c all equal to r. Not sure what's going on in your script and not sure it does what you're hoping it would (though I'm not sure what that is).

[Thang Lian]

Ive updated the question. Sorry for the confusion. The code runs but I was wondering if there are any syntax that could make it simplier.

[dpb]

"any syntax that could make it simplier."

See the Answer supplied below...

Answer 1

[dpb]

function [abc,ABC]=random_gen(n)
  r=randn(n,1);                                       % generate column vector N rn
  ix=discretize(r,[-inf -0.25 0.25 inf]);             % bin into three bins
  abc=arrayfun(@(i)x(ix==i),1:3,'UniformOutput',0);   % return binned values (3-cell array)
  ABC=accumarray(ix,r);                               % return bin sums (3-array)
end

Answer 2

[Walter Roberson]

Asum = Asum+a(n)

You have

a(n)=r(n);

Suppose it is true for n = 2 and 5. Then assigning to a(2) would create a(1) as 0, and assigning to a(5) would create a 3 and a 4 as 0. And if the total run was 10 then a6 onwards would not exist.