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@@ -78,6 +78,8 @@ with all sufficient information, see the ChangeLog file.
by deleting the specified row and column.
* Matrix#cofactor(row, column) returns the (row, column) cofactor
which is obtained by multiplying the first minor by (-1)**(row + column).
+ * hstack and vstack are new instance and class methods to stack matrices
+ horizontally and vertically.
* Method
* New methods: