#FREE42 ANDROID SKINS SKIN#I have also loaded the windows version on my computer at work, with a skin that is similar to the HP15C (for sentimental reasons…).Īlso browsing the developer’s website, I was surprised to see that this software was created in 2004, has had many updates & is available for android, iPhone, Windows, Linux & Mac. I’m sorry to say that I haven’t used very many of the advanced functions. The “Free42” RPN calculator is easy to use & works well. (Also, the approximately $90 or so purchase price at the time, with a young family really hurt!)Īlthough, my present position for the last twenty years doesn’t require anything advanced, RPN is still my first choice for a calculator. I used it very extensively, writing time saving programs for my job. I first started with my first RPN calculator when I worked in electrical engineering in the eighties with my HP15C. But I certainly can’t trust any results this app produces. I am completely baffled as to how this can be happening. At various times the Solver has worked correctly returned the ‘Sign Reversal’ error message found 7 as a root found only the root x=1 regardless of the initial estimate and found 6.03125 as a root. I have been using the quadratic equation x^2-5x+4 as a test case. But the Solver keeps producing strange, unexplainable results. I offer my apologies for my part in the confusion but not on behalf of some terribly confusing third party documentation. A little serious thinking took care of the rest. Referring to some high-quality (HP and true PDF, not scanned images) documentation cleared up some confusion about programming. Update: Developer’s comment that Solver uses TWO initial estimates cleared up some of the mystery.
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