# help with rle function on paired data

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## help with rle function on paired data

 Dear R Community - I hope you might be able to provide some guidance regarding the use of the rle function. I have a set of time-series data where a measured value is recorded every 30 seconds after the start of an experiment. Many of the measured values repeat and I am interested only in the values when there is a change. If I turn the measured values into a vector, the rle function works perfectly for this but I need also the corresponding time of the value and I am not sure how to use rle on paired data. Below is a brief example to help explain the problem. I thank you in advance for any assistance you might be able to provide. Regards, Steve Original dataset: ElpsdTime, DataValue 0, 1 30, 1 60, 1 90, 2 120, 2 150, 3 180, 2 210, 3 240, 3 . . Desired dataset: ElpTime DataValue 0, 1 90, 2 150, 3 180, 2 210, 3 . .
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## Re: help with rle function on paired data

 On 2012-06-08 14:33, Steve E. wrote: > Dear R Community - I hope you might be able to provide some guidance > regarding the use of the rle function. I have a set of time-series data > where a measured value is recorded every 30 seconds after the start of an > experiment. Many of the measured values repeat and I am interested only in > the values when there is a change. If I turn the measured values into a > vector, the rle function works perfectly for this but I need also the > corresponding time of the value and I am not sure how to use rle on paired > data. Below is a brief example to help explain the problem. I thank you in > advance for any assistance you might be able to provide. Regards, Steve > > Original dataset: > > ElpsdTime, DataValue > 0, 1 > 30, 1 > 60, 1 > 90, 2 > 120, 2 > 150, 3 > 180, 2 > 210, 3 > 240, 3 > . > . > > Desired dataset: > > ElpTime DataValue > 0, 1 > 90, 2 > 150, 3 > 180, 2 > 210, 3 > . > . Let's call your dataframe 'dat'. Here's a pretty brute-force way:    z <- rle(dat[, 2])    zV <- z\$values    zL <- z\$lengths    idx <- c(0, head(cumsum(zL), -1)) + 1    newdat <- data.frame(time = dat[idx, 1], value = zV)    newdat Peter Ehlers ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: help with rle function on paired data

 hello,I have a question regarding the function WebCorpus..When I am using this function its showing error: couldnt find the function...I have downloaded the tm package...Can you help me in this regard? Also I want to know how we can data/information about a product or topic from google,facebook etc using R...I have find a command corpus <- WebCorpus(GoogleFinanceSource("AAPL"))but this is not working and showing error couldnt find the function GoogleFinanceSource... please help me ..I will be thankful to youthanking you in anticipationShilpa RaiMSc.(2011-2013)Applied Statistics and Informatics Indian Institute of Technology,Bombay