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Albert Chan · 12-21-2018, 01:36 PM

(12-21-2018 12:20 PM)BruceH Wrote: However...

Code:

Expression length(x) part(x,0) part(x,1) part(x,2) ---------- --------- --------- --------- --------- 'NOT 5' 2 "of" NOT 5
Hmm, so maybe "of" can't be used to identify user-defined functions after all.

And lastly...

Code:

Expression length(x) part(x,0) part(x,1) part(x,2) ---------- --------- --------- --------- --------- 'RANDOM()' 1 "RANDOM" RANDOM error
Why doesn't this just return length 0 to signify no parameters?

FYI, tried that on Xcas 1.4.9-57 (win32):

length('NOT 5') ==> 1
part('NOT 5', 0) ==> not

length('random()') ==> 0
part('random()', 0) ==> random