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並前往https://stackoverflow.com/questions/7352254/how-to-subset-matrix-to-one-column-maintain-matrix-data-type-maintain-row-colu

How to subset matrix to one column, maintain matrix data type ...

Use the drop=FALSE argument to [ . m <- matrix(1:10,5,2) rownames(m) <- 1:5 colnames(m) <- 1:2 m[,1] # vector m[,1,drop=FALSE] # matrix.

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