Displaying 20 results from an estimated 4000 matches similar to: "writing data into files whose names are in a vector"
2012 Apr 22
2
difficulty in Formatting time series data
Dear R-Gurus
I have a data frame (from CSV file) which has its first column called Date.
The Date is in the format mm/dd/yyyy. I was trying to get the weekday for
these dates and I tried using wday() and day.of.week() functions and both
of them gave me precisely the wrong answers. I think the issue lies in the
proper formatting of dates. The class of this column is a factor class and
hence I
2012 Jul 08
3
Help in Optimization of a function
guRus!
I have a function f = exp(x^2-y+(1/z))
Also, x can take values from 1 to 37, y from 2 to 20 and Z from -13 to 51.
How can I find the maximum of f using any of the optimization functions
please?
Is there a way to store the possible values of x, y and Z in a single
variable like in a List or in a multi-dimensional array?
Thanks for your help
Raghu
[[alternative HTML version deleted]]
2012 Jul 24
3
Collapsing a vector/data-frame based on the previous values
Hello
I have a data frame like this:
dput(states)
structure(list(Date = c("24/07/2012", "25/07/2012", "26/07/2012",
"27/07/2012", "28/07/2012", "24/07/2012", "25/07/2012", "26/07/2012",
"27/07/2012", "28/07/2012"), State = c(1L, 1L, 1L, 1L, 1L, -1L,
-1L, -1L, 1L, -1L)), .Names = c("Date",
2012 Jun 19
1
Profit calculation
Dear guRus
Say I have a price vector, P which is P = c(20,50,40,50) for four
consecutive days.
My initial equity is say $100 and I re-invest the profits made in each
transaction so my equity curve increases.
If I go Long on day 1, short and short on day 2, long and long on day 3 and
finally short on day 4, how do I calculate the total profits using R?
Basically I stay invested at all times.
I
2010 Aug 06
2
How to read a file inside a function?
Hi
I wish to read a file from my local directory from inside a function. I am
passing the filename as the argument but this does not work.
Say for example
function(dat)
{
dat1=read.csv("D:\\dat.csv",header=TRUE)
}
If I call funtion(dat) I get the following error. 'Intuitively' i understand
this is a mistake but how do I overcome this and how can I read a file name
passed as an
2010 Aug 06
3
How to apply apply?!
guRus
I have say a dataframe, d and I wish to do the following:
1) For each row, I want to take one particular value of the row and multiply
it by 2. How do I do it. Say the data frame is as below:
OPEN HIGH LOW CLOSE 1931.2 1931.2 1931.2 1931.2 0 0 0 999.05 0 0 0 1052.5
0 0 0 987.8 0 0 0 925.6 0 0 0 866 0 0 0 1400.2 0 0 0 754.5 0 0 0 702.6 0 0 0
653.25 0 0 0 348 0 0 0 801 866.55 866.55
2010 Jul 28
3
how to code it??
Hi
I have say a large vector of 3500 digits. Initially the digits are 0s and
1s. I need to check for a rule to change some of the 0s to -1s in this
vector. But once I change a 0 to -1 then I need to start applying the rule
to change the next 0 only after I see the next 1 in the vector.
Say for example x = (0,0,0,0,0,0,0,1,0,0,1,1,0,0,1,0,0,0,1)
I need to traverse from the 9th element to the last
2010 Jul 28
2
finding the next highest number in an array
Hi
I have a sorted array ( in ascending order) and I want to find the subscript
of a number in the array which is the the next highest number to a given
number. For example,if I have 67 as a given number and if I have a vector
x=c(23,36,45,62,79,103,109), then how do I get the subscript 5 from x (to
get 79 which is the next highest to 67) without using a for loop?
Thx
--
'Raghu'
2010 Jul 06
4
Adding two files into one and vlookup
I have two files with dates and prices in each. The number of rows in each of
them will differ. How do I create a new file which contains data from both
these files? Cbind and merge are not helpful. For cbind because the rows are
not the same replication occurs. Also if I have similar data how do I write
a vlookup kind of function? I am giving an example below:
Say Price1 file contains the
2010 Jul 12
2
a small puzzle?
I know the following may sound too basic but I thought the mailing list is
for the benefit of all levels of people. I ran a simple if statement on two
numeric vectors (news1o and s2o) which are of equal length. I have done an
str on both of them for your kind perusal below. I am trying to compare the
numbers in both and initiate a new vector s as 1 or 0 depending on if the
elements in the arrays
2010 Jul 12
6
in continuation with the earlier R puzzle
When I just run a for loop it works. But if I am going to run a for loop
every time for large vectors I might as well use C or any other language.
The reason R is powerful is becasue it can handle large vectors without each
element being manipulated? Please let me know where I am wrong.
for(i in 1:length(news1o)){
+ if(news1o[i]>s2o[i])
+ s[i]<-1
+ else
+ s[i]<--1
+ }
--
2012 Jul 10
1
Help with vectors and rollapply
Hello
I have a vector a =(-2,0,0,0,1,0,0,3,0,0,-4)
I want to replace all zeros into previous non-zero state. So for instance the above vector should be converted into:
a= (-2,-2,-2,-2,1,1,1,3,3,3,-4)
I tried many things and finally concluded that probably(?) rollapply may be the best way?
I tried
f= function(x){
ifelse(x==0,Lag(x),x)
}
And then, rollappy(a,1,f) and that
2018 Sep 28
1
multiple mounts each varying bitrates
Hi,
Thanks, that helps a lot. I'm trying to get ices2 now to do the
multiple clients and sources, I'll post what I get later today.
Thanks.
Dave.
On 9/28/18, jake <jake at jakebriggs.com> wrote:
> I just realised my previous email didn't go to the list for some reason.
> Here it is again:
>
> Currently, I have three liquadsoap ".liq" files, and they all
2018 Mar 15
0
Vary an equation using values from a sequence
I thnk what you want is ?outer. e.g.:
outer(Data -min(Data),value,FUN = "+")
Whether this works for your real task, however, may depend on details and
complexities that you have omitted.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom
2014 Apr 09
1
FLASH NewsBites - Heartbleed Open SSL Vulnerability (fwd)
For even more information about "Heartbleed".
-Connie Sieh
---------- Forwarded message ----------
Date: Wed, 9 Apr 2014 12:27:54 -0500
From: The SANS Institute <NewsBites at sans.org>
Subject: FLASH NewsBites - Heartbleed Open SSL Vulnerability
FLASH NewsBites - Heartbleed Open SSL Vulnerability
FLASH NewsBites are issued only when a security event demands global and
immediate
2009 Mar 11
3
Converting a dataframe to a matrix
If I have a dataframe which is organized like this:
name color likes?
1 sally red 0
2 sally blue 1
3 sally green 1
4 jake red 0
5 jake blue 1
6 jake green 1
7 tom red 1
8 tom blue 0
9 tom green 0
And I want to create a matrix in the form:
red blue green
sally 0 1 1
jake 0 1 1
tom 1 0 0
Are there any built-in
2018 Mar 15
2
Vary an equation using values from a sequence
Hi All,
I have a vector of data on which I am operating. The equation with which I want to operate on the vector has a value k. I want to run the equation and output a new vector, each time replacing k with each value from the sequence I defined. I have thought about using for loops and such, but this seems like overkill. I am wondering if there is a simple solution that would allow me to
2009 Dec 12
1
Skipping of sample in ogg writing
Hi All,
I m having a strange problem with the Ogg-Vorbis writting code. The code
I m using to write is skipping some samples at the end of the file. For
example I m converting the 10000 sample .wav file ( 441000 sample rate ,
16 bit depth , stereo ) to ogg format. But while reading the ogg file I
only find 5824 samples in the ogg file. Can any one suggest what could
be wrong in the code. Is
2009 Dec 12
1
Skipping of sample in ogg writing
Hi All,
I m having a strange problem with the Ogg-Vorbis writting code. The code
I m using to write is skipping some samples at the end of the file. For
example I m converting the 10000 sample .wav file ( 441000 sample rate ,
16 bit depth , stereo ) to ogg format. But while reading the ogg file I
only find 5824 samples in the ogg file. Can any one suggest what could
be wrong in the code. Is
2020 Jul 20
3
Authentication with trusted credentials
Point #1: is not correct.
Why is Jake getting an ID from * Range and not APEX range. ?
That need to be found first
Run: net cache flush
Restart samba. : systemctl restart smbd winbind nmbd (and/or sssd is you use that)
wbinfo --all-domains -ug
id jake
getent passwd jake
Any improvement?
> if you have set: APEX:backend = ad
Yes, and did you assign an UID/GID after you changed RID to