Stuck using For-loops

I am completely new to Matlab and I am stuck. Hopefully someone will be able to help me. I'm trying to run a loop so I don't have to write repetitive lines of code. Below is a sample of my loop.

for k=0:5

    count000_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.000 & xyz_values_k(:,2)<0.025));
    count025_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.025 & xyz_values_k(:,2)<0.050));
    count050_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.050 & xyz_values_k(:,2)<0.075));
    count075_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.075 & xyz_values_k(:,2)<0.100));
    count100_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.100 & xyz_values_k(:,2)<0.125));
    count125_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.125 & xyz_values_k(:,2)<0.150));
    count150_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.150 & xyz_values_k(:,2)<0.175));
    count175_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.175 & xyz_values_k(:,2)<0.200));
    count200_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.200 & xyz_values_k(:,2)<0.225));
    count225_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.225 & xyz_values_k(:,2)<0.250));
    count250_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.250 & xyz_values_k(:,2)<0.275));
    count275_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.275 & xyz_values_k(:,2)<0.300));
    count300_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.300 & xyz_values_k(:,2)<0.325));
    count325_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.325 & xyz_values_k(:,2)<0.350));
    count350_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.350 & xyz_values_k(:,2)<0.375));
    count375_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.375 & xyz_values_k(:,2)<0.400));
    count400_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.400 & xyz_values_k(:,2)<0.425));
    count425_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.425 & xyz_values_k(:,2)<0.450));
    count450_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.450 & xyz_values_k(:,2)<0.475));
    count475_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.475 & xyz_values_k(:,2)<0.500));
    count500_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.500 & xyz_values_k(:,2)<0.525));
    count525_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.525 & xyz_values_k(:,2)<0.550));
    count550_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.550 & xyz_values_k(:,2)<0.575));
    count575_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.575 & xyz_values_k(:,2)<0.600));
    count600_k = numel(xyz_values_k(xyz_values_k(:,2)>=0.600 & xyz_values_k(:,2)<0.625));

    count_k = [count000_k, count025_k, count050_k, count075_k, count100_k, count125_k, count150_k, count175_k, count200_k, count225_k, count250_k, count275_k, count300_k, count325_k, count350_k, count375_k, count400_k, count425_k, count450_k, count475_k, count500_k, count525_k, count550_k, count575_k, count600_k];

    bar(count_k);
end

I'm having difficulties replacing the 'k's inside the code with the numeric values of the initial vector. If for-loops can't solve this problem, are there other options?

Answer 1

[Jacques]

use count000 = zeros(5,1); which declares a vector of 5 elements initialized at 0. Now, you can loop:

    for i=1:5
    count000(i) = blablabla...
    end
And make sure that xyz_values(:,2) is also a vector, by declaring xyz_values to be a 3dimensional matrix instead of 2D.

Even better, now you can keep only one variable for all count000, count025, etc... by using

count = zeros(5,22);
for i=1:5
for j=1:22
count(i,j) = blablabla... >= (j-1)*0.025  blablabla....
end
bar(i,:)
end

The (j-1)*0.025 gives you 0.00, 0.025, 0.050 etc as appropriate. By using two loops, you can reduce the size of the code pretty much :)