How do I create discrete intervals, sum relevant data and produce a histogram?

I want to create a histogram. I have two variables x and y. I want the data to be binned into regular intervals based on x values, but frequency to be calculated as the sum of Y for all X values in each interval.

Example data

if true
  % code
end
Y= [1, 1.1, 1.8, 0.7, 1.2, 1.7, 0.1]
X= [15, 21, 12, 24, 5, 34, 38 ]

We sort by X and place into discrete intervals of 0-10,10-20,20-30,30-40 We then sum the Y values within the intervals defined by X

if true
  % code
end
For x=0-10         Sum
1.2              = 1.2
For x=10-20
1.8 + 1          = 2.8
For x=20-30
1.1 + 0.7        =1.8
For x=30-40
1.7+0.1          =1.8

Then plot/histogram interval vs sum of y

end

Thank you in advance!!

[Stephen23]

When you use the {} Code button it inserts some sample code like this:

if true
  % code
end

but actually you do not need to keep this: all you need are the two spaces at the start of each line. You can edit your question and remove those superfluous lines of code and it makes your code easier to read because it is less confusing!

[tatyana gabellone]

this is utterly invaluable advice Many, many thanks for sharing this.

Answer 1

[Andrei Bobrov]

Y= [1, 1.1, 1.8, 0.7, 1.2, 1.7, 0.1];
X= [15, 21, 12, 24, 5, 34, 38 ];

[~,ii] = histc(X,[0:10:30,inf]);
out = accumarray(ii(:),Y(:));

[tatyana gabellone]

Many thanks!!

[Vlatko Milic]

Hi,

I have a follow up question. How do I performed the histogram plot with the summed value? I don't think "histogram(out)" makes the trick...