Re: HP 15C Message #4 Posted by Karl Schneider on 10 Aug 2004, 3:13 a.m., in response to message #3 by Bruce Leslie
Quote:
What exactly does flag 8 do? I notice that the trig functions don't work when it is set.
Flag 8, when set, puts the HP-15C in Complex mode, which uses 5 emory registers to create a parallel stack and Last X register for the imaginary parts of complex numbers.
Also, an entire set of mathematical functions operates in the complex domain, with complex-valued inputs and outputs:
+, -, *, /, sin, cos, tan, arcsin, arccos, arctan, sinh, cosh, tanh, arcsinh, arccosh, arctanh, e^x, ln, log, 10^x, 1/x, y^x, sqrt(x), x^2.
abs, ->R, ->P also work a bit differently in Complex mode.
The 15C was probably the first handheld calc to provide this kind of built-in functionality, in 1982.
Edited: 10 Aug 2004, 3:15 a.m.
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