Writing tests
A useful function for transferring your Excel use case into a CSharp test is:
=QSA.GetCSArray(data)
Which turns a block of numbers into something like:
{{3578,0,0,0,0,0,0,0,0,3578},
{0,0,0,272,0,106,0,0,0,378},
{0,100,33,33,0,75,1242,750,0,2234},
{131,791,668,1465,6059,4787,12302,18641,4349,49194},
{11,476,0,16,37,0,0,0,0,539}}