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  1. PO
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    <p>Something like this might work for your first part. I'm unable to download the file right now but when I can, I will try and respond to the second part as well.</p> <pre><code>library(data.table) library(stringr) # Slightly modified dataset dataset &lt;- data.table( Sequence = c( 'AAAAGAAAVANQGKK' ,'AAAAGAAAVANQGKK' ,'AAIKFIKFINPKINDGE' ,'AAIKFIKFINPKINDGE' ,'AAIKFIKFINPKINDGE' ,'AAIKFIKFINPKINDGE' ,'AAIYKLLKSHFRNE' ,'AAKKFEE' ), modifications = c( '[14] Acetyl (K)|[15] Acetyl (K)' ,'[14] Acetyl (K)|[15] Acetyl (K)' ,'[4] Acetyl (K)|[7] Something (K)|[12] Acetyl (K)' ,'[4] Acetyl (K)|[7] Acetyl (K)|[12] Acetyl (K)' ,'[7] Acetyl (K)|[12] Acetyl (K)' ,'[4] Acetyl (K)|[7] Acetyl (K)' ,'[5] Biotin (K)|[8] Acetyl (K)' ,'[3] Acetyl (K)' ) ) # get the 1st, 2nd, 3rd modifications in separate columns dataset &lt;- data.table(cbind( dataset, str_split_fixed(dataset[,modifications], pattern = "\\(K\\)",3) )) dataset[,':='( V1 = as.character(V1), V2 = as.character(V2), V3 = as.character(V3) )] # Count of modifications dataset[, NoOfKs := 3] dataset[V3 == "", NoOfKs := 2] dataset[V2 == "", NoOfKs := 1] dataset[V1 == "", NoOfKs := 0] # Retaining Acetyl/Biotin or no modification only dataset[, AB01 := TRUE] dataset[, AB02 := TRUE] dataset[, AB03 := TRUE] dataset[V1 != "", AB01 := grepl(V1, pattern = "Acetyl|Biotin")] dataset[V2 != "", AB02 := grepl(V2, pattern = "Acetyl|Biotin")] dataset[V3 != "", AB03 := grepl(V3, pattern = "Acetyl|Biotin")] dataset &lt;- dataset[AB01 &amp; AB02 &amp; AB03] # Marking each modification as acetyl/biotin/none dataset[V1 != " " &amp; grepl(V1, pattern = "Acetyl"), AB1 := "Acetyl"] dataset[V1 != " " &amp; grepl(V1, pattern = "Biotin"), AB1 := "Biotin"] dataset[V2 != " " &amp; grepl(V2, pattern = "Acetyl"), AB2 := "Acetyl"] dataset[V2 != " " &amp; grepl(V2, pattern = "Biotin"), AB2 := "Biotin"] dataset[V3 != " " &amp; grepl(V3, pattern = "Acetyl"), AB3 := "Acetyl"] dataset[V3 != " " &amp; grepl(V3, pattern = "Biotin"), AB3 := "Biotin"] dataset[ , list( Sequence = Sequence, modifications = modifications, GroupID = .GRP ), by = c('NoOfKs','AB1','AB2','AB3') ] </code></pre> <p>Output</p> <pre><code> NoOfKs AB1 AB2 AB3 Sequence modifications GroupID 1: 2 Acetyl Acetyl NA AAAAGAAAVANQGKK [14] Acetyl (K)|[15] Acetyl (K) 1 2: 2 Acetyl Acetyl NA AAAAGAAAVANQGKK [14] Acetyl (K)|[15] Acetyl (K) 1 3: 2 Acetyl Acetyl NA AAIKFIKFINPKINDGE [7] Acetyl (K)|[12] Acetyl (K) 1 4: 2 Acetyl Acetyl NA AAIKFIKFINPKINDGE [4] Acetyl (K)|[7] Acetyl (K) 1 5: 3 Acetyl Acetyl Acetyl AAIKFIKFINPKINDGE [4] Acetyl (K)|[7] Acetyl (K)|[12] Acetyl (K) 2 6: 2 Biotin Acetyl NA AAIYKLLKSHFRNE [5] Biotin (K)|[8] Acetyl (K) 3 7: 1 Acetyl NA NA AAKKFEE [3] Acetyl (K) 4 </code></pre>
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    1. POComparing two columns "by the sequence" and making new column
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    1. PTAnswer
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    1. USTheComeOnMan
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    1. POComparing two columns "by the sequence" and making new column
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    1. VO
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      1. VTAcceptedByOriginator
    1. COYou did a pretty nice job. Let me try to analyse it. I need some time coz I use R studio (much easier for me to use it coz of the colours etc) and the package data.table and stringr is not avaialbe for the R studio yet. I'll try to install R and we will see.
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      1. USShaxi Liver
    2. CORstudio is a GUI wrapper for R. Any R package should work on Rstudio as well. What's the error message exactly?
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    3. COThat this package is made for the R 3.0.2 version.
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      1. USShaxi Liver
 

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