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LUX mimics a regular calculator if you enter calculator mode using the
calculator command. You can only enter this mode from the main
execution level (i.e., not from inside a subroutine or function). This
mode is indicated by the clc> prompt, and you can leave it again
by issuing a return command.
In calculator mode, you modify the value of variable $ by issuing
calculator commands. The value must be a numerical scalar or array, or
a string. After each command has been completed, the current value of
$ is displayed. Each command is ended by a newline and consists
of a LUX expression or simple assignment implicitly or explicitly
containing $ as an operand. This variable is an implicit operand
in the following cases: binary operations where the first operand is
missing, simple assignments where the left-hand side is missing, and
simple assignments that consist of just the name of a single-argument
function (which is applied to the value of $).
If a command consists of just a single name, then it is taken to be the name of a single-argument function that is to be applied to the current value. If you wish to assign the value of a variable, then prepend an equal sign.
See also: calculator