How to get area of a polygon in matlab

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SUSHMA MB
SUSHMA MB 2015-4-10
回答： Stalin Samuel 2015-4-10
I have coordinates of a polygon saved in excel sheet, now i want to get the area of the polygon in matlab. First i will make the excel sheet read in matlab, then after that how to get the area?

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Stalin Samuel
Stalin Samuel 2015-4-10
for example
data =[4,10;9,7;11,2;2,2;4,10]%from excel file
data(5,:) =data(1,:)
for i=1:max(size(data))-1
s(i)=data(i,1) *data(i+1,2)-data(i,2)*data(i+1,1)
end
area = abs(sum(s)/2)

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Thomas Koelen
Thomas Koelen 2015-4-10

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