search for: snp005

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2009 Mar 30
1
Sum of character vector
Dear list, I am trying to evaluate how many elements in a vector equal a certain value. The vectors are the columns of a data.frame, read in using read.table(): > dim(data) [1] 2600 742 > data[1:5,1:5] SNP001 SNP002 SNP003 SNP004 SNP005 1 GG AA TT TT GG 2 GG AA TC TT GG 3 GG AC CC TT GG 4 AG AA TT TT GG 5 GG AA TC TT GG > table(data[,1]) AA AG GG 251 1093 1252 but if I do > sum(data[,1]=="GG") [1] NA I...