I have a data set like this: if I want to less than 200000 obs from this data set. How can I do these? > str(p1982) 'data.frame': 465979 obs. of 6 variables: $ p : Factor w/ 1982 levels "154l_aa","1A0P_aa",..: 1 1 1 1 1 1 1 1 1 1 ... $ aa : Factor w/ 19 levels "ALA","ARG","ASN",..: 2 16 4 5 18 3 19 3 2 9 ... $ as : num 152.0 15.9 65.1 57.2 28.9 ... $ ms : num 108.8 28.3 59.2 49.9 31.8 ... $ cur: num -0.1020 0.2564 0.0312 -0.0550 0.0526 ... $ sc : num 92.10 103.67 7.27 72.98 96.12 ...
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2 messages · Aimin Yan, jim holtman
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