Displaying 4 results from an estimated 4 matches for "date_1".
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date1
2007 Jun 15
1
comparing dates
hello,
i have to dates :
@date_1 = date.new()
@date_2 = date.new()
i want to compare theses two dates
i have tried
@date_1 > @ date_2 but every time it returns me FALSE
is there a solution .?????
thanks
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2010 Feb 21
1
Comparing two date columns
...;s. I've also tried using the chron
function to compare the two and have been unsuccessful. I then tried to
use:temp.2 <- as.POSIXct(strptime(temp, '%d/%m/%Y')) where temp is character
vector of one of the date columns this did not work either. I'm not sure
what to do now.
date_1 date_2
2005-11-25 <NA>
2007-10-23 <NA>
<NA> 1999-12-13
2006-01-25 <NA>
2006-06-12 <NA>
2005-08-08 <NA>
2007-12-12 <NA>
2008-04-29 <NA>
2005-03-28 <NA>
2004-11-18 2000-11-0...
2010 Dec 10
1
melt causes errors when characters and values are used
...`[<-.factor`(`*tmp*`, ri, value = c(1, 4, 5)) :
invalid factor level, NAs generated
It would be useful in this situation that the numerical column got
converted to a character column in this situation. Any ways round this?
In actual fact I have got a situation where it is more like this
ID Date_1 Value_1 Date_2 Value_2 ...
and I would like to convert it to a data.frame of ID, Date & Value but I
thought the above would be an appropriate middle step.
Thanks
Dan
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**************************************************************
Daniel Brewer, Ph.D.
Institute of Cancer Research
Molecula...
2010 Dec 11
0
is there a packge or code to generate markov chains in R
...`[<-.factor`(`*tmp*`, ri, value = c(1, 4, 5)) :
invalid factor level, NAs generated
It would be useful in this situation that the numerical column got
converted to a character column in this situation. Any ways round this?
In actual fact I have got a situation where it is more like this
ID Date_1 Value_1 Date_2 Value_2 ...
and I would like to convert it to a data.frame of ID, Date & Value but I
thought the above would be an appropriate middle step.
Thanks
Dan
--
**************************************************************
Daniel Brewer, Ph.D.
Institute of Cancer Research
Molecula...