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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