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Moved data frame comments #60

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Moved data frame comments #60

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9 changes: 4 additions & 5 deletions 02-intro2R.Rmd
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Original file line number Diff line number Diff line change
Expand Up @@ -252,11 +252,10 @@ chr <- c("chr1", "chr1", "chr2", "chr2")
strand <- c("-","-","+","+")
start<- c(200,4000,100,400)
end<-c(250,410,200,450)
mydata <- data.frame(chr,start,end,strand)
#change column names
names(mydata) <- c("chr","start","end","strand")
mydata # OR this will work too
mydata <- data.frame(chr=chr,start=start,end=end,strand=strand)
mydata <- data.frame(chr,start,end,strand) # create data frame
names(mydata) <- c("chr","start","end","strand") # change column names
mydata
mydata <- data.frame(chr=chr,start=start,end=end,strand=strand) # OR this will work too
mydata
```
There are a variety of ways to extract the elements of a data frame. You can extract certain columns using column numbers or names, or you can extract certain rows by using row numbers. You can also extract data using logical arguments, such as extracting all rows that have a value in a column larger than your threshold.
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