Setq()
setq(<number>,<string>)
The setq() function is used to copy strings into local registers. It returns a null string; it is a purely "side effect" function.
There are thirty-six local registers, numbered 0 through 9 and A through Z. They are cleared at the start of each interactive command, but are preserved across the command queue. They are most useful for storing complex function evaluations which are used repeatedly within a single command. The local registers may be read via the r() function, and a common use of setq()/r() is to temporarily store the result of a complex evaluation whose result is needed more than once.
setq() can be used to improve the readability of MUX code, as well as to cut down the amount of time needed to do complex evaluations.
Example
> &TEST me=Test on [mudname()] at [time()].
> say [setq(0,u(TEST))]'[r(0)]' has length [strlen(r(0))].
You say, "'Test on TestMUX at Tue Feb 23 17:00:51 1993.' has length 45."