Hi, I tried to use DataFrame.values to convert a list of columns in a dataframe to a numpy ndarray/matrix,
matrix = df.values[:, list_of_cols] but got an error, IndexError: only integers, slices (:), ellipsis (...), numpy.newaxis (None) and integer or boolean arrays are valid indices so what's the problem with the list of columns I passed in? many thanks -- https://mail.python.org/mailman/listinfo/python-list
