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HP Calculators / Math problems?
« on: September 15, 2014, 11:49:47 pm »
Hello!
I'm a proud Prime owner and, as my first graphing calc, I could not be happier.
However there are two problems(?) that I found while playing around with it:
On the Home screen, doing (1/9)*9 gives me 0.999... , when it should result in 1. Switching between exact and approximate modes converts 0.99... into 1. I know it might be related to floating point calculation and obvious approximations, but either way, doing that with CAS gives only 1.
And the second problem is dividing by zero in CAS, which results in infinity. The same calculation in Home results in Error, which is expected, as, for all I know, division by zero is supposed to be undefined.
Please enlighten me if I misinterpreted the results.
GHM
I'm a proud Prime owner and, as my first graphing calc, I could not be happier.
However there are two problems(?) that I found while playing around with it:
On the Home screen, doing (1/9)*9 gives me 0.999... , when it should result in 1. Switching between exact and approximate modes converts 0.99... into 1. I know it might be related to floating point calculation and obvious approximations, but either way, doing that with CAS gives only 1.
And the second problem is dividing by zero in CAS, which results in infinity. The same calculation in Home results in Error, which is expected, as, for all I know, division by zero is supposed to be undefined.
Please enlighten me if I misinterpreted the results.
GHM