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get ids associated with an edge in a chunkgraph #148

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Merged
merged 1 commit into from
Oct 28, 2025
Merged

get ids associated with an edge in a chunkgraph #148

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11 changes: 11 additions & 0 deletions chunkie/@chunkgraph/edgeids.m
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
function ids = edgeids(cgrph, ichs)
%edgeids return the indices corresponding to points in cgrph.echnks(ichs)
npts = [cgrph.echnks.npt];
% get starting index for each edge
idstart = [1,cumsum(npts)+1];

ids = [];
for i = 1:length(ichs)
ids = [ids, idstart(ichs(i)):(idstart(ichs(i)+1)-1)];
end
end
16 changes: 15 additions & 1 deletion devtools/test/slicegraphTest.m
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Original file line number Diff line number Diff line change
Expand Up @@ -50,4 +50,18 @@ function slicegraphTest0()
matdiff = norm(sysmat_slc - sysmat(idslce, idslce));
fprintf('error in sliced system matrix is %e\n',matdiff)
assert(matdiff < 1e-10)
end


% test getting ids of edges
ids = edgeids(cgrph,[3,4,2,1]);

% test values are correct
assert(all(sort(ids) == (1:sum([cgrph.echnks(1:4).npt]))));
% test sorted by input list
assert(~all(sort(ids) == ids));

ids = edgeids(cgrph,ichs);
% compare edgeids to manual version
assert(all(ids == idslce));

end
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