search for: neigbour

Hi , I have two sorted vectors X and Xi, where the range of Xi lies within the range of X. For an element in Xi, I want to find the neigbouring data in X, e.g. find an index ix so that for element number k, then X[ix[k]] < X[k] < X[ix[k] +1] # also OK with "<=" on either one, but not both This is easy to code by looping over the data in X,Xi, but I suspect there may be a faster and more elegant way to do this in R....

I have corrected a typo in my previous posting. In what follows the line with the inequality is correct Hi , I have two sorted vectors X and Xi, where the range of Xi lies within the range of X. For an element in Xi, I want to find the neigbouring data in X, e.g. find an index ix so that for element number k, then X[ix[k]] < Xi[k] < X[ix[k] +1] # also OK with "<=" on either one, but not both This is easy to code by looping over the data in X,Xi, but I suspect there may be a faster and more elegant way to do this in R....

Dear R users, I am trying to perform a hypothesis test on a marked point pattern. I would like to calculate the mean of the absolute value of the difference of marks between nearest neigbours, randomize the marks among points, then calculate this mean again. Ideally, I would test whether random mean values smaller than the observed mean value occur less than 5% of the time. I suppose 1000 permutations would be a reasonable starting point (the ppp object has 27 points). so far, I'v...

Hi, I have a data.frame with 294 columns and 211 rows. I am calculating correlations between all pairs of columns (excluding column 1) and based on these correlation values I delete one column from any pair that shows a R^2 greater than a cuttoff value. (Rather than directly delete the column all I do is store the column number, and do the deletion later) The code I am using is: ndesc

...e a Dell T710 with 4 X 10G ethernet interfaces (2 X Dual port Intel 82599 cards). It is running FreeBSD RELENG_8 last updated on July 13. What I see is packet loss (0 - 40%) on IPv6 packets in vlans, when the machine is not the originator of the packets. Let me try to describe a little more. If a neigbouring machine ping6 it, there will be packet loss. If it act as a router for ipv6, there will be packet loss. This happen even when the network is pretty idle and with different switches (Nortel and Cisco equipment). The packet loss is very fluctuating. Pinging 1000 packets might loose 1% one time and...

...a frame df like this: >df V1 V2 V3 V4 V5 1 6.414094 c t a g 2 6.117286 t a g t 3 5.756922 a g t g 4 6.090402 g t g t ... which holds the response in the first column and letters (a,c,g,t) in the other columns. I am interested to see if there are interactions between the neigbouring letters so I have defined the following linear model: >lm<-lm(df[,1] ~ (df[,2]:df[,3]) + (df[,3]:df[,4]) + (df[,4]:df[,5]) ) the result then looks like this: Coefficients: (1 not defined because of singularities) Estimate Std. Error t value Pr(>|t|) (Interc...

...a frame df like this: >df V1 V2 V3 V4 V5 1 6.414094 c t a g 2 6.117286 t a g t 3 5.756922 a g t g 4 6.090402 g t g t ... which holds the response in the first column and letters (a,c,g,t) in the other columns. I am interested to see if there are interactions between the neigbouring letters so I have defined the following linear model: >lm<-lm(df[,1] ~ (df[,2]:df[,3]) + (df[,3]:df[,4]) + (df[,4]:df[,5]) ) the result then looks like this: Coefficients: (1 not defined because of singularities) Estimate Std. Error t value Pr(>|t|) (Interc...

I'm having a problem booting Slackware 10.1 boot CD's as well as an isolinux image of my own. The system is a VIA Epia M10000 and the drive is an AOpen ISU-8424E CD/DVD writer. If I use a Toshiba CD-RW/DVD-ROM Drive SD-R2612 in place of the AOpen DVD writer, the cd boots fine and everything works as expected. What's the best course for further debugging of this problem? The only

Which consumer-priced 1.5TB drives do people currently recommend? I had zero read/write/checksum errors so far in 2 years with my trusty old Western Digital WD7500AAKS drives, but now I want to upgrade to a new set of drives that are big, reliable and cheap. As of Jan 2010 it seems the price sweet spot is the 1.5TB drives. As I had a lot of success with Western Digital drives I thought I would