Read only certain columns from xls
问题 I have an excel spreadsheet with several sheets. The format is as below: Date A B C D E F Reference Ref Date Half life 03/01/13 6.29 5.28 8.15 4.93 11.67 6.4 8.88 01/01/99 30.23 04/01/13 6.39 5.39 8.22 5.04 11.75 6.4 07/01/13 6.34 5.32 8.17 4.92 11.82 6.4 08/01/13 6.33 5.3 8.16 4.96 11.68 6.4 09/01/13 6.29 5.29 8.13 4.93 11.73 6.4 10/01/13 6.29 5.32 8.17 4.95 11.61 6.4 11/01/13 6.21 5.27 8.12 4.95 11.57 6.4 14/01/13 6.28 5.28 8.09 4.92 11.65 6.4 15/01/13 6.25 5.26 8.06 4.9 11.59 6.4 16/01/13