# How to subset the matrix/array with shape file?

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Shakir Hussain el 26 de Jun. de 2018
I have matrix of 890*751 and array 890*751*5 and I want to clip/crop/subset this matrix and array with shape file. The shape file is consist on several sub-polygon inside. Each inside sub-polygon of shape file has to clip/crop/subset separately and save with unique name. E.g, we have a shape file with 4 sub-polygon (with name (a,b,c,d) and we have to get 4 clip/crop/subset(a,b,c,d) of the matrix/array with. we can read the shape file by
geoshow( area , 'Facecolor', 'blue')
but no idea how to crop/clip/subset the matrix/array. The sample testmatrix, testarray and shapefile are attached here for easy to understand the question. Thank you in advance for any helpe/guide
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Shakir Hussain el 26 de Jun. de 2018
Dear KSSV, the lat lon of matrix are attached here
KSSV el 26 de Jun. de 2018
Editada: KSSV el 26 de Jun. de 2018
aaah...got it....

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KSSV el 26 de Jun. de 2018
Editada: KSSV el 26 de Jun. de 2018
Check this link for a similar question. You can follow the same code.
shapefile = 'shapefile.shp' ;
N = length(S) ;
for i = 1:N
plot(S(i).X,S(i).Y)
hold on
end
lon = load('testlon.mat') ; lon = lon.testlon ;
lat = load('testlat.mat') ; lat = lat.testlat ;
[X,Y] = meshgrid(lon,lat) ;
data = load('testarray.mat') ; data = data.testarray ;
[nx,ny,d] = size(data) ;
%%Extract data
iwant = cell(d,N) ;
for i =1:d
A = data(:,:,i) ;
for j = 1:N
idx = inpolygon(X(:),Y(:),S(i).X,S(i).Y) ;
iwant{i,j} = A(idx) ;
end
end
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Shakir Hussain el 19 de Ag. de 2018
Yes, Now it is fixed and code is working well. Last thing is how we convert the result (iwant) into 2d matrix according to the polygon extend?
Adi Mulsandi el 22 de Oct. de 2020
Hi Shakir Hussain can you share how to convert the result (iwant) into 2d matrix according to the polygon extend?

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