# Want to weight Histogram entries by value

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simon lumsdon il 18 Giu 2022
Modificato: Vlatko Milic il 19 Dic 2022
I am using a nx2 array to populate a Histogram
23 2
12 2
85 3
38 3
12 4
09 2
97 4
and want a histogram (or bar chart?) with second attribute as the X axis and the first attribute to be summed up rather then the elements just counted, so the hist would plot
44 2
123 3
111 4
Rather than
3 2
2 3
2 4
Can you help suggest how to use BAR or HISTOGRAM to achieve this please?
Many thanks
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### Risposta accettata

Voss il 18 Giu 2022
data = [
23 2
12 2
85 3
38 3
12 4
09 2
97 4
];
[groups,group_ids] = findgroups(data(:,2))
groups = 7×1
1 1 2 2 3 1 3
group_ids = 3×1
2 3 4
totals = splitapply(@(x)sum(x(:,1)),data,groups)
totals = 3×1
44 123 109
bar(group_ids,totals)
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Voss il 18 Giu 2022
You're welcome! Any questions, let me know. Otherwise, please "Accept This Answer". Thanks!
Vlatko Milic il 19 Dic 2022
Modificato: Vlatko Milic il 19 Dic 2022
Do you have any idea of how I could make the corresponding procedure but with set intervals on the x-axis, i.e. 2.5-3.5 etc.? Your solution is quite close to what I want to accomplish, but without the intervals...

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### Più risposte (1)

Steven Lord il 18 Giu 2022
data = [
23 2
12 2
85 3
38 3
12 4
09 2
97 4
];
[V, G] = groupsummary(data(:, 1), data(:, 2), @sum)
V = 3×1
44 123 109
G = 3×1
2 3 4
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