41CL Quiz: Determinant of 30x30 anti-Identity matrix

[Joe Horn]

(05-11-2018 07:48 PM)John Keith Wrote:  OK, more cheating. HP 50g, exact mode:

Code:

\<< { 30 30 } 1 CON 30 IDN - DET \>>

Result: 29
Physical calculator: 61 seconds.
Emulator: 2.17 seconds.

I'm sure the Prime would be much faster but I don't have mine handy.

Prime in CAS view: det(makemat(1,30,30)-IDENMAT(30))
Result: -29
Physical calculator (HW rev C): 0.041 seconds
Emulator: around 0.00224 seconds

EDIT: The 50g's approx mode is much faster than exact mode in this case. If the input is a matrix of reals (TYPE 3) instead of a symbolic array of integers (TYPE 29), DET returns -29.0000000000 in 14.17 seconds.