Stuck using For-loops

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Tyee
Tyee 2014-3-8
编辑： Jacques 2014-3-8
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?

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采纳的回答

Jacques
Jacques 2014-3-8
编辑：Jacques 2014-3-8
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 :)

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