MATLAB frequency histogram problem

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Phil
Phil 2014-8-18
编辑： Image Analyst 2014-8-19
Hey everybody,
I'm having trouble recreating a frequency histogram. The data are exported from an external software as ASCII. Any help is appreciated! This is how it looks: The program returns two column vectors. One vectors contains the occurance/frequency (e.g. 2;0;1 ..), the other the already binned observation (e.g. distances like 150;150.5;151 ..). What I'd like to do now is to generate a vector containing just the (binned) data. According to the above example: (150;150;151). I already tried some loops (though it didn't work and I don't have them at hand right now - there has to be an easy solution for it). One more thing: If I rehistrogram the data with Matlab, will it change the binsize due to the absence of the value 150.5 as mentioned above? Though this should have no effect on the mean? Thanks a lot!
Phil
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Image Analyst
Image Analyst 2014-8-18
Do you mean the values of the centers of the bins? Like let's say one bin goes from 150.0000000 to 151.00000000. Would the value you're talking about be 150.5 (i.e. the value at the center of the bin)?
Phil
Phil 2014-8-19
I'm pretty sure it's the central value of each bin since the difference (binsize) is constant over all values. Attached please find the example.

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回答（1 个）

Phil
Phil 2014-8-19
编辑：Image Analyst 2014-8-19
Ok, worked it out. Fairly simple.
function histogram(bins,counts)
outvec = [];
for i = 1:length(counts)
if counts(i,1) ~= 0
for n = 1:counts(i,1)
outvec = [outvec bins(i,1)];
end
else
end
end
outvec = outvec*10^9;
hist(outvec, length(bins))
end

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