apply_family.r

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list_operations.r

data_analysis.r

vector_ops.r

matrix_calc.r

function_def.r

data_subset.r

apply_family.r

regex_extract.r

formula_model.r

environment_ops.r

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apply_family.r

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lapply(split(df, df$group), function(x) {↵

x[order(-x$value), ][1:3, ]↵

}) %>% do.call(rbind, .)

0WPM•0%•0:00•0/95(0%)|Ln 1, Col 1

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関連する練習問題

list_operations.r data_analysis.r vector_ops.r matrix_calc.r function_def.r data_subset.r