R Tutorial 20: Getting specific items in dataframes using which()

R Tutorial 20: Getting specific items in dataframes using 'which' operator/

Advanced sub-setting of Dataframes in R. Learn how to make complex filtering of your data using the 'which' statement'.

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[krzysztofs]

Thank you for your videos and educating the community.

[rajguptaverma]

hello sir, thank u for providing this video, i need help to extract all rows where column A have specific value lets say 5 or 6 as per data used in video

[randomchannel]

question :
i want  to transpose  certain number of element from a column of data frame  to  several new columns. for example i have a data frame named( A: to 500) and i want to  transpose every 5 element from  data frame A to five new columns  A, B, C, D and E.  For eg  i want to  make new data frame  A, B, C, D, E with element (  1to5, 26, 27, 29, 30, 41, 52, 53, 54, 55) in column  in column B, and  so on.  

is there any  solution for this kind of problem ?

[daksutube]

First of all Thanks for sharing this tutorial.
I tried with a dataframe where the value of the item is a date (such as 01/02/2014). It doesn't work. Any hint? Thanks

[lalaithan]

attach() has proper applications and will do what one wants if detach() is used properly. Don't tell people to not use something unless it does things you can't fix, which isn't recommended for beginners.

[dilipsighrathore]

When using multiple condition:
below error occurred
Error: unexpected '<' in "ry [which(ry[, 1]>1 $ ry[, 2]<"
plz give solution....