On 2/2/19 12:41 AM, malika yassa via R-help wrote:
Please, can you help me I have a equation to solve by newton method but I can
not do it
for example
f<-function(x) {
2+X2-X3=0}
this equation have un solution in [1,2]
is there a function in R for solve it or i have to programme it
(a)
Hello Nick Wray,
Let me offer a simplified explanation of what's going on. Sorry if it's
unnecessary.
Sound is waves of pressure in the air. Devices like microphones can
measure the changing pressure by converting it into voltage. Voltage
can then be sampled by an analog-to-digital converter
You aren't pushing any envelope... you slit it open and fell out somewhere on
the sidewalk. I tossed your question into Google and it came back with [1] and
[2]. Please do that yourself instead whenever you are tempted to go off topic.
[1]
If there are no time-of-day values in your data set the the Date type is great.
However, it can be messy if you work with both Date and POSIXt types in the
same analysis... I recommend sticking with one or the other.
The trunc.POSIXt function is more appropriate for getting POSIXt dates than
On 1/29/2019 11:50 PM, Jeff Newmiller wrote:
On Tue, 29 Jan 2019, Alan Feuerbacher wrote:
After my failed attempt at using Octave, I realized that most likely
the main contributing factor was that I was not able to figure out an
efficient data structure to model one person. But C lent itself
strptime = string parse time (convert from string to POSIXlt, name of function
as specified in POSIX standard)
strftime = string format time (make string, name of function as specified in
POSIX standard)
as.POSIXlt = convert to POSIX list time format (same as strptime but name fits
type
... and in general, you need to specify the time zone to avoid surprises. In
many cases this can be as simple as
Sys.setenv(TZ="GMT")
but it can be specific to your data set also.
On February 2, 2019 7:09:46 AM PST, Duncan Murdoch
wrote:
>On 01/02/2019 10:45 p.m., C W wrote:
>> Dear R
> On 1 Feb 2019, at 12:41, malika yassa via R-help wrote:
>
> Please, can you help me I have a equation to solve by newton method but I can
> not do it
> for example
>
> f<-function(x) {
>
>
> 2+X2-X3=0}
> this equation have un solution in [1,2]
> is there a function in R for solve it or
Note that the first unparsable element is the first with a 13 in the second
field, which is out of range for the month entry. If you look at the the
whole date/time output by the first 19 elements you will see that you need
to tell it the order of the year, month, and day
> as.POSIXlt(dat[1:19])
On 01/02/2019 10:45 p.m., C W wrote:
Dear R community,
I am working with dates. And I get the following error:
strftime(dat[20], format="%H:%M")
Error in as.POSIXlt.character(as.character(x), ...) :
character string is not in a standard unambiguous format
You are using the wrong
Look at the rootSolve package[1] for what you need. Hope it helps... -- H
On Sat, 2 Feb 2019 at 06:46, malika yassa via R-help
wrote:
> Please, can you help me I have a equation to solve by newton method but I
> can not do it
> for example
>
> f<-function(x) {
>
>
> 2+X2-X3=0}
> this equation
Please, can you help me I have a equation to solve by newton method but I can
not do it
for example
f<-function(x) {
2+X2-X3=0}
this equation have un solution in [1,2]
is there a function in R for solve it or i have to programme it
[[alternative HTML version deleted]]
Dear R community,
I am working with dates. And I get the following error:
> strftime(dat[20], format="%H:%M")
Error in as.POSIXlt.character(as.character(x), ...) :
character string is not in a standard unambiguous format
Here's the original data:
dat <- structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L,
I have been given a wav file of train locomotive noise - literally something
you can play back and hear. Using the audio package and the load.wave function
I have got a 1.5 million element vector which visually at least has some
periodicity in certain parts and does not seem to be completely
Dear all,
I am trying to run a GAM using MGCV. When I include offset:
gam1 <- gam(Presence~s(Spd)+offset(effort_m), family=binomial, data=porp)
I receive the following warning:
Warning messages:
1: In newton(lsp = lsp, X = G$X, y = G$y, Eb = G$Eb, UrS = G$UrS, L = G$L, :
Fitting terminated
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