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August 29, 2015 14:12
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extract all the sub set of a set
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| sub_index = function(x){ | |
| n = length(x) | |
| com = paste0(rep('0:1,', n), collapse='') | |
| com = paste0('expand.grid(', | |
| substr(com, 1, nchar(com)-1), | |
| ')', collapse = '') | |
| eval(parse(text = com)) | |
| } | |
| sub_set = function(x){ | |
| index = sub_index(x) | |
| apply(sub_index(x), 1, function(index) x[as.logical(index)]) | |
| } | |
| x = 1:2 | |
| sub_set(x) |
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