Casio fxcg 500, FX CP 400

[ijabbott]

(01-24-2024 08:45 PM)bxparks Wrote:  I couldn't believe that a calculator would do this, so I tried it on the fx-9750giii that I got recently, and holy crap, it turns the real number "-2" into the complex number "2∠180". But inconsistently, it doesn't turn the real number "2" into the complex number "2∠0". I think I would be happier if it was consistent. So the expression "2-4" becomes "2∠180". No other (non-Casio) calculator that I know does this, a quick check: TI-83+/84+, TI-89T, HP-42S/Free42, none of them do this.

The TI-83/TI-84 will leave "-2" as-is in complex polar mode, but will convert "-2+0i" to polar form. I.e., if it looks real, it will allow it to be negative, but if it looks complex, it will convert it to the current complex mode. The polar mode is actually shown in exponential form, even when the angle mode is degrees, which is somewhat misleading, e.g. "-2+0i" is shown as \(2e^{180i}\).

TI-89 series will convert a complex number with zero imaginary part to a real number, so "-2+0i" is converted to "-2".

HP-42S will happily convert two real numbers in Y and X to a complex number in X according to the current RECT or POLAR mode (although they are always stored in rectangular form), and will display complex numbers in the current RECT or POLAR mode. The modulus is always positive. The "+/-" key will change the argument by π radians or 180 degrees or 200 grad.