On Oct 30, 2010, at 12:27 PM, Sudhakar Kumar wrote:
Just starting on my journey to learn R and the book I am using is
"Using R for Introductory Statistics"
One of the problems (page 15, 1.10) goes as follows:
The monthly sales fig for 2002 were (2700, 2600, 3050, . . ). Using
diff() find the month with greatest increase from prev month.
I created a msales var:
msales = c(2700, 2600, 3050 . . )
I named them:
names(msales)=c("Jan", Feb", "Mar" . . .)
Get in the habit of copy-pasting from the console. This is not valid
code.
to find the month with greatest increase from prev month:
max(diff(msales))
I get the numeric value displayed when I execute the above function,
but not the month. cumsum(msales) displays the results under each
month, but not max. How can I get both the month and value displayed?
> diff(msales)[which.max(diff(msales))]
Mar
450
--
David Winsemius, MD
West Hartford, CT
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