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Say I have a data.frame:df <- data.frame(A=c(10,20,30),B=c(11,22,33), C=c(111,222,333)) A B C1 10 11 1112 20 22 2223 30 33 333If I select two (or more 阅读全文
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Liang always brings me interesting quiz questions. Here is one: If i have a table like below: chr1 113438 114495 1 chr1 114142 114143 chr1 113438 1144 阅读全文
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How to use grep to match multiple strings in the same line? grep 'string1\|string2' filename grep -E "string1|string2" filename How can I grep for a s 阅读全文