Displaying 20 results from an estimated 50 matches for "pyne".
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2010 Dec 09
4
Sequence generation in a table
Dear R helpers
I have following input
f = c(257, 520, 110). I need to generate a decreasing sequence (decreasing by 100) which will give me an input (in a tabular form) like
257, 157, 57
520, 420, 320, 220, 120, 20
110, 10
I tried the following R code
f = c(257, 520, 110)
yy = matrix(data = NA, nrow = 3, ncol = 6)
for (i in 1:3)
{
value = NULL
for (j in 1 : 6)
{
2002 Mar 13
3
Windows 98 and samba
...see it in the Network Neighborhood,
but whenever I try to browse any shares it asks for a password. No matter
what I try, I can't get it to authenticate (even thought the shares are
marked as public).
Any suggestions on troubleshooting will be greatly appreciated.
--Richard
--
Richard B. Pyne
Software Engineer
ShopSite, Inc.
2011 Mar 09
3
Rearranging the data
Dear R helpers,
xx = data.frame(country = c("USA", "UK", "Canada"), x = c(10, 50, 20), y = c(40, 80, 35), z = c(70, 62, 10))
> xx
country x y z
1 USA 10 40 70
2
UK 50 80 62
3 Canada 20 35 10
I need to arrange this as a new data.frame as follows -
country type values
USA
2011 Mar 29
3
Reversing order of vector
Dear R helpers
Suppose I have a vector as
vect1 = as.character(c("ABC", "XYZ", "LMN", "DEF"))
> vect1
[1] "ABC" "XYZ" "LMN" "DEF"
I want to reverse the order of this vector as
vect2 = c("DEF", "LMN", "XYZ", "ABC")
Kindly guide
Regards
Vincy
[[alternative HTML
2011 Aug 25
1
Autocorrelation using acf
...I am simply not able to figure out how acf is used?
Thanking you in advance.
Regards
Vincy
--- On Wed, 8/24/11, Prof Brian Ripley <ripley@stats.ox.ac.uk> wrote:
From: Prof Brian Ripley <ripley@stats.ox.ac.uk>
Subject: Re: [R] Autocorrelation using library(tseries)
To: "Vincy Pyne" <vincy_pyne@yahoo.ca>
Cc: r-help@r-project.org
Received:
Wednesday, August 24, 2011, 9:08 AM
Your understanding is wrong. For a start, there is no function acf() in package tseries: it is in stats.
And the autocorrelation at lag one is not the correlation omitting the first and last...
2011 Aug 23
4
Correlation discrepancy
Dear R list, I have one very elementary question regrading correlation between two variables.
x = c(44,46,46,47,45,43,45,44)
y = c(44,43,41,41,46,48,44,43)
> cov(x, y)
[1] -2.428571
However, if I try to calculate the covariance using the formula as
covariance = sum((x-mean(x))*(y-mean(y)))/8 # no of of paired obs. = 8
or
covariance = sum(x*y)/8-(mean(x)*mean(y))
gives
2010 Dec 30
1
Sorting data.frame datewise in a descending order
.................
1/31/2010 429 103
When I tried
mydat.sort <- mydat[order(mydat$date)]
> mydat.sort <- mydat[order(mydat$date)]
Error in `[.data.frame`(mydat, order(mydat$date)) : undefined columns selected
Kindly guide
Vincy Pyne
[[alternative HTML version deleted]]
2011 Jan 25
4
Subtracting elements of data.frame
Dear R helpers
I have a dataframe as
df = data.frame(x = c(1, 14, 3, 21, 11), y = c(102, 500, 40, 101, 189))
> df
x y
1 1 102
2 14 500
3 3 40
4 21 101
5 11 189
# Actually I am having dataframe having multiple columns. I am just giving an example.
I need to subtract all the rows of df by the first row of df i.e. I need to subtract each element of 'x' column by 1. Likewise I
2010 Oct 27
4
One silly question about "tapply output"
Dear R helpers
I have a data which gives Month-wise and Rating-wise Rates. So the input file is something like
month rating rate
January AAA 9.04
February AAA 9.07
..........................................
..........................................
Decemeber AAA 8.97
January BBB 11.15
February
2011 Sep 14
2
Question regarding dnorm()
Hi,
I have one basic doubt. Suppose X ~ N(50,10).
I need to calculate Probability X = 50.
dnorm(50, 50, 10) gives me
[1] 0.03989423
My understanding is (which is bit statistical or may be mathematical) on a continuous scale, Probability of the type P(X = .....) are nothing but 1/Infinity i.e. = 0. So as per my understanding P(X = 50) should be 0, but even excel also gives 0.03989422. Obviously
2010 Dec 31
3
Changing column names
Dear R helpers
Wish you all a very Happy and Prosperous New Year 2011.
I have following query.
country = c("US", "France", "UK", "NewZealand", "Germany", "Austria", "Italy", "Canada")
Through some other R process, the result.csv file is generated as
result.csv
var1 var2 var3 var4 var5 var6 var7
2012 May 22
3
What's wrong with MEAN?
Dear R helpers,
I have recently installed R version 2.15.0
I just wanted to calculate
mean(16, 18)
Surprisingly I got answer as
> mean(16, 18)
[1] 16
> mean(18, 16)
[1] 18
> mean(14, 11, 17, 9, 5, 18)
[1] 14
So instead of calculating simple Arithmetic average, mean command is generating first element as average. I restarted the machine, changed the machine, but still the
2012 Apr 20
3
Matrix multiplication by multple constants
Dear R helpers
Suppose
x <- c(1:3)
y <- matrix(1:12, ncol = 3, nrow = 4)
> y
[,1] [,2] [,3]
[1,] 1 5 9
[2,] 2 6 10
[3,] 3 7 11
[4,] 4 8 12
I wish to multiply 1st column of y by first element of x i.e. 1, 2nd column of y by 2nd element of x i.e. 2 an so on. Thus the resultant matrix should be like
> z
[,1] [,2] [,3]
[1,] 1
2012 Sep 12
6
How to append the random no.s for different variables in the same data.frame
Dear R helpers,
(At the outset I sincerely apologize if I have not put forward my following query properly, though I have tried to do so.)
Following is a curtailed part of my R - code where I am trying to generate say 100 random no.s for each of the products under consideration.
library(plyr)
n = 100
my_code = function(product, output_avg, output_stdev)
{
BUR_mc = rnorm(n, output_avg,
2008 Jun 01
2
Requested CRAM-MD5 scheme, but we have only MD5-CRYPT
After upgrading my dovecot installation about a month ago, I have started
seeing "Requested CRAM-MD5 scheme, but we have only MD5-CRYPT" message
from dovecot in my logs.
Any help in finding and correcting the cause will be greatly appreciated.
--Richard
2011 Mar 15
2
Matching two vectors
Dear R helpers
Suppose I have a vector as
vect_1 = c("AAA", "AA", "A", "BBB", "BB", "B", "CCC")
vect_1_id = c(1:length(vect_1))
Through some process I obtain
vect_2_id = c(2, 3, 7), then I need a new vector say vect_2 which will give me
vect2 = ("AA", "A", "CCC") i.e. I need the subset of
2011 Mar 16
2
One to One Matching multiple vectors
Dear R helpers
Suppose,
x = c(0, 1, 2, 3)
y = c("A", "B", "C", "D")
z = c(1, 3)
For given values of z, I need to the values of y. So I should get "B" and "D".
I tried doing
y[x][z] but it gives
> y[x][z]
[1] "A" "C"
Kindly guide.
Regards
Vincy
[[alternative HTML version deleted]]
2011 May 30
2
Value of 'pi'
Dear R helpers,
I have one basic doubt about the value of pi. In school, we have learned that
pi = 22/7 (which is = 3.142857). However, if I type pi in R, I get pi = 3.141593. So which value of pi should be considered?
Regards
Vincy
[[alternative HTML version deleted]]
2010 Aug 30
2
Band-wise Conditional Sum - Actual problem
...you in advance and sincerely apologize for any mis-communication if it had occurred in my earlier mail.
Regards
Vincy
--- On Fri, 8/27/10, David Winsemius <dwinsemius@comcast.net> wrote:
From: David Winsemius <dwinsemius@comcast.net>
Subject: Re: [R] Band-wise Sum
To: "Vincy Pyne" <vincy_pyne@yahoo.ca>
Cc: r-help@r-project.org
Received: Friday, August 27, 2010, 2:36 PM
On Aug 27, 2010, at 9:49 AM, Vincy Pyne wrote:
> Hi
>
> I have a large credit portfolio (exceeding 50000 borrowers). For particular process I need to add up the exposures based on the...
2012 Jul 19
3
Maintaining Column names while writing csv file.
Dear R helpers,
I have one trivial problem while writing an output file in csv format.
I have two dataframes say df1 and df2 which I am reading from two different csv files.
df1 has column names as date, r1, r2, r3 while the dataframe df2 has column names as date, 1w, 2w.
(the dates in both the date frames are identical also no of elements in each column are equal say = 10).
I merge these