Ok… I know I haven’t posted very much lately in the tips department– there’s a new tip up now about converting a full matrix representation to a half representation. Read more for more, or just check it out!

There’s a tip posted on converting the following:
i1,j1,val1
i2,j2,val2
i3,j3,val3
j1,i1,val1
j2,i2,val2
j3,i3,val3

If we know that every A[i,j] = A[j,i], we don’t need both! How do we filter out the duplicates? Especially if we don’t know that every element is posted in both i,j and j,i format?