When I subset a matrix to a single column, the result is of class numeric, not matrix (i.e. myMatrix[ , 5 ] to subset to the fifth column). Is there a compact way to subset to a single column, maintain the matrix format, and maintain the row/column names without doing something complicated like:When I subset a matrix to a single column, the
阅读背景：
如何将矩阵的子集划分为一列，维护矩阵数据类型，保持行/列名?
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