
Hi thereI appreciate for your reply.I am running into another problem now, the following is my date (example)2000-1-4	    -0.0383447182000-1-5	   0.0019222252000-1-6	   0.0009557022000-1-7	   0.0270903842000-1-10	   0.0111899662000-1-11    -0.0130625692000-1-12	   -0.0043863312000-1-13	   0.0121696632000-1-14	   0.0106713212000-1-18	   -0.0068320652000-1-19	   0.0005222872000-1-20	   -0.0070952682000-1-21	   -0.002912346Let's focus on the dates, by using weekdays(as.Date('2010-11-30')) == "Monday", im supposed to find the monday return (2nd column)i create an array which includes the dates, let's call it dates. then when i plug in the dates into the following codesi=1while(i<14){if(weekdays(as.Date(dates[i])) == "Monday"){pirnt ("yes")}else {print("no")}i=1+i}the programe does not run properly.......cuz im expecting to see "yes" been returned (there is not any "no" returned, all of them are "yes"......). i guess dates[i] returns "2010-1-1", but the as.Date requires '2010-1-1'.. please help me out. I appreciate.Bill

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> Date: Wed, 1 Dec 2010 03:34:01 +0100
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