Incorrect results and quirks

[B1nary0]

(03-31-2015 01:02 AM)Tim Wessman Wrote:  

(03-30-2015 10:03 PM)B1nary0 Wrote:  I'm not sure why it evaluates these two expressions differently, my TI-nSpire handles it correctly

Change the domain from "real" to "rectangular/polar" and give is a look. The results will change. The heritage from the HP side is that the power will give the primary branch as stated, while the NTHROOT will return the real solution only.

I was unable to find this option, but I only want real number solutions.

Quote:and written as programs) and evaluate it for the value of "-1" and for 2 matrices, one with a -1 in the first position, the other with 1 in the first position.

Try turning on the "allow complex result from real input" setting in your Home Settings screen. Guessing that will resolve it for you. This was specifically put in there because so many educators don't want sqrt(-1) to return complex results too early. Unfortunate that rather then viewing that as a teaching moment they just want an error ...

I tried changing this option, but I had the same results. But again,... I do not want any non-real results, nor should I get any. 2 - 2/(cube root(-1) is 4,.... cube root of -1 is -1, 2/-1 is -2, 2-(-2)=4,.... I shouldn't be getting any imaginary,.... complex,.... numbers if I am using odd number roots.

Also,... shouldn't I get the same result for X^(1/3) and cuberoot(X)?,....

Also also,... when I do the function -1^(1/3) I get -1,.... when I do the same function of a variable that I set to -1, I get an imaginary,...errrr "complex" number,.....