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2071 zjchen 1 
!! +var+ +exec+ +string+
11219 bpr 2 
tit:column
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type:$type_both
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alias:columns
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syntax:!column `numlist' of `string'
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mean:输出按照 `numlist' 在矩阵 `string' 里选出的列(用逗号分隔).\
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  矩阵的行可以用换行号或分号 ``;'' 分隔. <p>\
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  如果只选一列, 则输出用逗号分隔, 否则按照矩阵 `string' 的分隔方式.