Let's vote for suggestions and bugs
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09-24-2018, 07:34 PM
Post: #74
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RE: Let's vote for suggestions and bugs
I'm not a programmer and I just use basic to intermediate of Prime, but I'm still concerned about the previous problem that I posted before, as it is a quite simple operation and I expect to have reliable answers from the calculator. I will describe the same example but with a different perspective.
Matrix A and B are related to a 2x2 linear system to be solved. A= | -19.3| | 12| B= |-270510 510| |510 -2710| In HP48, HP50 and Prime (CAS View) you can divide A/B (and the calculators understand this single operation as B^(-1) x A) or you can also do it as B^(-1) x A indeed. The answer you get is the correct one: | 6.30207608396E-5| |-4.41618428486E-3| But in Prime (HOME View) you get a wrong answer: |7.13720385033E-5| |-4.4296159231E-3| The answer is even worse if you decide to use the Linear Equation Solver app: | 0| |-4.41618428485E-3| The problem is due to the algorithm internally and weirdly rounding just part of B^(-1) to zero in the HOME view. I could use inv(B) but I think it is boring and time consuming compared to a simple division. And more important, I think the calculator should have the same behavior as of presenting accurate answers in both views. My question is how much can I trust in HOME view and Linear Equation Solver App of HP Prime. I personally likes the HOME view because of the RPN system... |
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