Re: wp34s 2.0 Beta Release Message #30 Posted by Dieter on 10 June 2011, 10:24 a.m., in response to message #1 by Marcus von Cube, Germany
The first thing I noticed was a permanent decimal point/comma even for integers in ALL and FIX 0. This always annoyed me on other calculators. On the 41series this can be solved by clearing Flag 29 (thousands separator off), while on the 34s even after E3OFF the decimal marker remains visible.
While we are on this topic: some time ago we had a discussion concerning an improved standard display format that switches to scientific notation only if the value is below 0,01 or 0,001. If memory serves well, this was generally considered a good idea. So, how about that?
I also wonder if there is a way that makes SHOW display all 16 digits. Yes, I know the display only has 12 digits. I also would prefer the classic MANT/SHOW style that also displays trailing zeroes. But the 16digit issue is something I really would appreciate.
The second thing I tried was  once again ;)  the precision of the statistical distributions and their inverses. The Chisquare quantile still returns values that are completely off. Try 10 d.o.f. and p = 1E9 and you will get something like 2,01256 (which also looks like it required substantial execution time on a physical 20s/30s), while the correct result is 0,083152. In the meantime I have found a method that gives a nice initial estimate for the Chisquare quantile, which is within 10...+6% of the true value (or even +/3% after some tweaks). In most cases a 16digit result is obtained after 4  6 iterations. Also, an estimate for the Fquantile should be no big problem. Let me know if there's sufficient space left and the better estimate can be implemented.
Dieter
