Is there a way to find out what the computation duration time was to complete
executing a code chunk?
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PLEASE do read the posting guide
Is there a reference page indicating which packages or functions are available
in R for the filed of electrical engineering?
I'm not an EE but I've been doing some simulations regarding signals and noise
and I found the 'tuneR' to be useful. Are there any others?
Dear R users,
I'm hoping to get a few suggestions about which books are good to follow along
and learn R.
I'm hoping to spend the summer going through a good R book as it is applied in
linear regression.
Thanks!
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I want to take this numerical methods course where the text is
http://www.amazon.com/Numerical-Methods-J-Douglas-Faires/dp/0534407617 . The
instructor recommends MATLAB, but states Fortran, C, Mathematica, or Maple will
also do the job.
Will R do the job as well?
If not, where do you think it
How would I numerically find the x value where the derivative of the function
below is zero?
x - seq(1,2, by = .01)
y - 5*cos(2*x)-2*x*sin(2*x)
plot(x,abs(y), type = l, ylab = |y|)
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?uniroot for other options and tolerance settings.
HTH,
Dennis
On Wed, Aug 11, 2010 at 6:21 PM, TGS cran.questi...@gmail.com wrote:
How would I numerically find the x value where the derivative of the
function below is zero?
x - seq(1,2, by = .01)
y - 5*cos(2*x)-2*x*sin(2*x)
plot(x,abs
I think I understand your question and the following would produce the result
you've posted.
(x - matrix(c(1, 2, 2, 3, 1, 2, 1, 2, 3, 4), nrow=5, byrow=TRUE))
On Aug 12, 2010, at 5:41 AM, clips10 wrote:
Thanks for the help,
I tried to apply this to a vector with two columns, well I suppose
Yes, please do as Erik said in the future but here's one way to do it.
(A - matrix(data = rnorm(n = 9, mean = 0, sd = 1), nrow = 3, ncol = 3, byrow =
FALSE, dimnames = NULL))
matrix(rowSums(A))
On Aug 12, 2010, at 11:28 AM, Amit Patel wrote:
Hi
I am trying to calculate the row sums of a
I'd like to plot a point at the intersection of these two curves. Thanks
x - seq(.2, .3, by = .01)
f - function(x){
x*cos(x)-2*x**2+3*x-1
}
plot(x,f(x), type = l)
abline(h = 0)
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Yes, I'm playing around with other things but the points() function is what I
was looking for. Thanks
On Aug 12, 2010, at 12:47 PM, David Winsemius wrote:
On Aug 12, 2010, at 3:43 PM, TGS wrote:
I'd like to plot a point at the intersection of these two curves. Thanks
x - seq(.2, .3
the horizontal line is, for
instance in the case where y (is-not) 0?
On Aug 12, 2010, at 12:47 PM, David Winsemius wrote:
On Aug 12, 2010, at 3:43 PM, TGS wrote:
I'd like to plot a point at the intersection of these two curves. Thanks
x - seq(.2, .3, by = .01)
f - function(x){
x*cos(x)-2*x**2+3
, at 1:00 PM, David Winsemius wrote:
On Aug 12, 2010, at 3:54 PM, TGS wrote:
Actually I spoke too soon David.
I'm looking for a function that will either tell me which point is the
intersection so that I'd be able to plot a point there.
Or, if I have to solve for the roots in the ways which
= uniroot(f = f3, interval = c(.2, .3))$root, lty = 'dotted')
points(x = uniroot(f = f3, interval = c(.2, .3))$root, y = -.1)
# Thanks David!
On Aug 12, 2010, at 1:33 PM, David Winsemius wrote:
On Aug 12, 2010, at 4:15 PM, TGS wrote:
David, I was expecting this to work but how would I specify
I downloaded their Academic version and installed it on a Windows virtual
machine (as there is not a Mac version available).
I played around with it a little bit and wasn't overly impressed. I still like
my current configuration: textmate with R bundle on Mac OSX.
With textmate data entry is a
# how would I code in R to look at the letter of the alphabet
# in the second column and create a indicator column for the
# corresponding letter?
data(InsectSprays)
InsectSprays$spray
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To clarify, I'd like to create a column of indicators for the respective
letters so that I could maybe do regression on indicators, etc.
For instance, A gets 1, B gets 2, and so on.
On Aug 13, 2010, at 10:19 AM, David Winsemius wrote:
On Aug 13, 2010, at 1:03 PM, TGS wrote:
# how would I
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] On Behalf Of TGS
Sent: Friday, August 13, 2010 11:22 AM
To: David Winsemius
Cc: r-help@r-project.org
Subject: Re: [R] Dealing with data
To clarify, I'd like to create a column of indicators
line per term).
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
-Original Message-
From: TGS [mailto:cran.questi...@gmail.com]
Sent: Friday, August 13, 2010 11:51 AM
To: Greg Snow
Cc: r-help@r
was asking and giving an alternative that would still use 5 degrees of
freedom.
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
-Original Message-
From: TGS [mailto:cran.questi...@gmail.com]
Sent: Friday, August 13, 2010 1:52
or an incompetent
Such harsh words Peter. You're not making this a friendly environment for
people to ask questions. Is there a less competent attribute mailing list so
that some of us don't offend you with our questions?
On Aug 13, 2010, at 2:11 PM, Peter Dalgaard wrote:
Andrea Franceschini
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