DM 42

[Thomas Okken]

I just released Free42 2.0.3, which fixes acos(cos(1+i)) and asin(acos(atan(tan(cos(sin(1+0i)))))), and a few other edge cases.

I found that some of the incorrect branches were because of negative zeros. I added code to test for those where I found them, but the more rigorous approach would be to change the < and > operators to not consider -0 < 0. That would make the internal semantics of Free42 match those of the HP-42S. I'll do that in the next release.

(05-26-2017 01:17 PM)jch Wrote:  I had to use a paper clip to reset my DM42 after I tried to create a 100 x 100 matrix.
That yields to a 'Malloc Error' and I had to reset the calculator. I first tried a gentle pressure, but it requires a firm one.

That is something you should definitely report to SwissMicros. When memory allocation fails while trying to create a matrix that is too large, Free42 handles the NULL returned by malloc(), and cleans up gracefully and returns the "Insufficient Memory" error message, just like the HP-42S. It should not freeze!

Perhaps they decided to catch malloc() failures at the system level because there are a few places in Free42 where it doesn't handle memory allocation failures properly, but the thing to do is to fix those places *in Free42*, not make malloc() do weird things when it can't satisfy an allocation request.