how can i make a histogram from 2 vectors of data?

I have two vectors of data: X which is length ( X is not evenly distributed)and Y which is frequency of particles at each length.

Is there a function that I can use to make a histogram out of this with a certain bin-width. or in a more general way create a histogram at positions X2(new defined vector for bin position)

note: This data of current form of plot(X,Y) is not a histogram because of the uneven distribution of X. As far as I understand the function hist takes only 1 vector and by calculating mean and all that creates a histogram only from that. which is not the thing i'm after.

Answer 1

[Star Strider]

It seems from your description that you already have a histogram, with Y being the frequency of particles at each length given in X. If that is the situation, use a bar plot:

X = unique(randi(50,1,15));     % Create Data
Y = randi(50,1,size(X,2));      % Create Data

figure(1)
bar(X, Y)
grid

It will do what it seems you want to do.

[José-Luis]

That won't work if you want to specify bins.

[Star Strider]

The bins are already specified in X. At least that’s the way I read it.

[Image Analyst]

I agree with Star. Somehow he has frequency (the counts) in Y (a very poor name), so Y is already the histogram. The only way he could have gotten that is if it's already been determined which bins the data lie in. So he must have had some data that is a list of a bunch of lengths, say it's called lengths. Then (somehow, in an unspecified way we don't know) he determined what the bins are - their edges or centers or however you want to specify it - and that is what he's calling X (another very non-descriptive poor name in my opinion). Poor naming of variables is one of the most common reasons why people like us who try to answer get confused.

Answer 2

[José-Luis]

Sounds like you need a weighted histrogram