Is there a way to look up what method would be called for a given signature? I'm trying to find which method is called forrowSumson adgRmatrix. Injulia, this would be something likemethods(sum, Tuple{SparseMatrixCSC}))orwhich(sum, Tuple{SparseMatrixCSC}). ...
all input cell arrays must be same data type. Might be due to the '31.1.2013' in the 3. column...? So that relates to you question - no, not all are numbers.)
Matlab (and Julia) try to give both speed and interactive use – they come to the table as the prototyping languages for high performance computing. They are meant to take big matrices and crunch away. They too are domain specific not general purpose languages, but the set of people interest...