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count the values based on ID and create a new matrix

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nlm
nlm 2019-2-10
评论： nlm 2019-2-10
Input:
LAT LON VALUE
12.4 91.4 4
31.4 45.6 1
45.9 91.5 2
18.4 96.4 3
11.4 75.6 2
25.9 51.5 4
12.4 91.4 4
31.4 45.6 2
45.9 91.5 2
As you can see some of the lat lon's are repeated with different values, so I want to know for a lat lon, how many times (count) a values is observed. I have a input matrix of (90,000, 3)
LAT LON cnt = 1 cnt=2 cnt=3 cnt =4
12.4 91.4 0 0 1 2
31.4 45.6 1 1 0 0
45.9 91.5 0 1 2 0
18.4 96.4 0 0 1 0
11.4 75.6 0 1 0 0
25.9 51.5 0 0 0 1
I tried table, I could not figure out.
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madhan ravi
madhan ravi 2019-2-10
Well good then :
t=[12.4 91.4 4
31.4 45.6 1
45.9 91.5 2
18.4 96.4 3
11.4 75.6 2
25.9 51.5 4
12.4 91.4 4
31.4 45.6 2
45.9 91.5 2];
T=array2table(t,'VariableNames',{'LAT','LON','COUNT'})
groupsummary(T,{'LAT','LON','COUNT'}) % gives almost your result but in more compact way
nlm
nlm 2019-2-10
I have already tried it, as mentioned earlier. It does not give me the form that I'm looking for. I need it like this
LAT LON cnt = 1 cnt=2 cnt=3 cnt =4
12.4 91.4 0 0 1 2
31.4 45.6 1 1 0 0
45.9 91.5 0 1 2 0
18.4 96.4 0 0 1 0
11.4 75.6 0 1 0 0
25.9 51.5 0 0 0 1

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回答（1 个）

Image Analyst
Image Analyst 2019-2-10
Use unique() to get unique rows. Then for each unique row (lat,lon combination), call histogram.
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Image Analyst
Image Analyst 2019-2-10
Hist is an object. Look at it's properties and methods and you'll know what to do. Take the semicolon off of that line to see the properties.
nlm
nlm 2019-2-10
编辑：nlm 2019-2-10
I did, doesn't help.
Error in matlab.graphics.chart.primitive.Histogram/get.BinCounts

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