a special kind of switch used in computers to connect multiple lines (I/O) to a single line. A related component is the multiplexor. Both components are used in the execution of conditional logic such as memory addressing and device selection and signaling.
a person who purchased land by "conditional purchase" under the legislation relating to Crown land management, passed in 1861 in the Colony of New South Wales in Australia. The legislation allowed for ‘free selection before survey’ and was closely identified with John Robertson (Secretary for Lands).
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The option of row and column selectors with read-write tables can be very useful with such tasks as tedit or tcalc, but it should be used with caution when reordering the table, such as with tsort.
Just append the selector expression enclosed in square brackets, with a prefixed "r:" or "c:" to indicate if the row or column selector is being used.
The row selector has two interfaces: one which evaluates the expression for a single row and one which evaluates the expression for the entire table.
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