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biomathjdaily
2011 May 27
1
FW: Unable to Plot using headers.
-----Original Message-----
From: Struckmeier, Nathanael
Sent: Friday, May 27, 2011 1:39 PM
To: 'stephen's mailinglist account'
Subject: RE: [R] Unable to Plot using headers.
Thanks for the input. Despite both graphing directly and with "attach" I
am still getting a screwed up graphical output as well as an error.
My table is object "demand" w/ columns Date and
2011 May 27
1
FW: FW: Unable to Plot using headers (converting to Numeric)
I tried command
as.numeric(Qty) #converting column"Qty" in object "demand" to
numeric. However it remains a non-numeric value.
What is the best way to convert a column of data to a numeric value in
R?
What is the best way to convert dates into a numeric format (or some
format able to be used in an x,y scatter) while still maintaining its
inherent "date" property?
2011 May 19
3
problem with optim()
Dear R-users,
I would like to maximize the function g above which depends on 4 parameters (2 vectors, 1 real number, and 1 matrix) using optim() and BFGS method. Here is my code:
# fonction to maximize
g=function(x)
{
x1 = x[1:ncol(X)]
x2 = x[(ncol(X)+1)]
x3 = matrix(x[(ncol(X)+2):(ncol(X)+1+ncol(X)*ncol(Y))],nrow=ncol(X),ncol=ncol(Y))
x4 = x[(ncol(X)+1+ncol(X)*ncol(Y)+1):length(x)]