HP Prime Matrix TERRIBLE bug and question  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP Prime Matrix TERRIBLE bug and question (/thread256901.html) 
HP Prime Matrix TERRIBLE bug and question  uklo  11242013 Hi everyone, i found this terrible bug using the Home mode, and the CAS mode. I'm not sure if this was already reported, because is really anoying. CAS mode:
Home mode: BUG
BY THE WAY. Does anyone know if its possible to do operations with matrices and/or polynomials using modulo 2 arithmetic?
Edited: 24 Nov 2013, 11:58 p.m.
Re: HP Prime Matrix TERRIBLE bug and question  Han  11252013 Wow, that is a bad bug.
For modulo 2 arithmetic, just use the MOD command. Need to be in CAS view, though. I think Home view expects realvalued arguments (i.e. numbers and not matrices).
Re: HP Prime Matrix TERRIBLE bug and question  uklo  11252013 Thanks Han, I used MOD on CAS Mode and it worked fine (using capital letters).
That bug only happens when the matrices are big, I don't know why. I hope they fixt it with an update :)
Re: HP Prime Matrix TERRIBLE bug and question  From Hong Kong  11252013 I think the vector notation for [1 1 0 1 1 0 1] screws up the calculator in HOME. Please use the matrix notation instead, i.e. [[1 1 0 1 1 0 1]], and it works fine. The product of the two matrices also carries the matrix notation.
Edited: 25 Nov 2013, 12:41 a.m.
Re: HP Prime Matrix TERRIBLE bug and question  Michael de Estrada  11252013 Matrices are just groupings of elements that can be numbers or symbols. Matrix arithmetic is in fact by default numeric, although symbolic operations are fine in CAS. The example shown above should work perfectly in Home view.
Re: HP Prime Matrix TERRIBLE bug and question  Michael de Estrada  11252013 Good point. You are actually multiplying a 1x7 matrix by a 7x3 matrix to obtain a 1x3 matrix as the result, i.e. [[4 3 2]]. The easiest way to create matrices is to use textbook entry, which will automate the process and avoid syntax errors.
Re: HP Prime Matrix TERRIBLE bug and question  uklo  11252013 Quote: Ohh now I see. I was using Shift + 5 to create the matrix, but I didn't realize that the square bracket is different.
Thank you all for your answers.
Re: HP Prime Matrix TERRIBLE bug and question  Michael de Estrada  11252013 No, the square bracket is the same; it's just that you need two of them. The outer set of brackets denote the overall matrix, and the inner ones denote the rows. So, The 3x7 matrix is [[1,0,0],[0,1,0],....[1,1,0]].
Re: HP Prime Matrix TERRIBLE bug and question  Paul Dale  11252013 It is still a bug. Anything that screws up is a bug. Either make the operation illegal with an error message or make it work. It shouldn't return bogus results.
Re: HP Prime Matrix TERRIBLE bug and question  From Hong Kong  11252013 Yes, but this is a quick workaround. The HP engineers need some time to fix it. :)
Re: HP Prime Matrix TERRIBLE bug and question  Michael de Estrada  11252013 Well, if you try certain matrix operations such as transpose on a vector it will definitely give an error message. But, I agree that the operation shown in the OP should also fail rather than give a bogus result. By the same token, you can't perform vector operations such as dot product on matrices.
Edited: 25 Nov 2013, 1:22 a.m.
Re: HP Prime Matrix TERRIBLE bug and question  From Hong Kong  11252013 Press Shift5 twice to get the matrix notation, i.e. double square brackets. Edited: 25 Nov 2013, 1:24 a.m.
Re: HP Prime Matrix TERRIBLE bug and question  From Hong Kong  11252013 FYI, the TRN function works fine for a vector but the result is a matrix!
Re: HP Prime Matrix TERRIBLE bug and question  Ángel Martin  11252013 There's something as bad as bugs  inconsistency in the implementation. That leads to never knowing how to correctly do things, and always doubting (ie. not trusting) the results!
Re: HP Prime Matrix TERRIBLE bug and question  Geir Isene  11252013 Ain't that true!
Re: HP Prime Matrix TERRIBLE bug and question  Katie Wasserman  11252013
Quote: Well said! This is exactly why I've avoiding buying a Prime. Beta testing should have caught virtually all the bugs on all the recently released HP calculators, but there's this push to get stuff out the door when it's far from ready. This might be fine and necessary (from a marketing perspective) for certain devices but not for something who's purpose is to be trusted.
Re: HP Prime Matrix TERRIBLE bug and question  Walter B  11252013 Thanks Katie! I couldn't have said it better.
d:I
Re: HP Prime Matrix TERRIBLE bug and question  Mic  11252013 I saw these bugs with matrices. Re: HP Prime Matrix TERRIBLE bug and question  René Franquinet  11252013 This also is my motive to not yet buy the Prime. I remember the Prime has been announced quite some time ago. So I thought all the prerelease users of devoted calculator lovers would have traced all the flaws and errors and bugs the device could have. And the answer is: no, there still will be a lot of bugs the weeks and months to come. So I still will wait before I buy this prematurely highly praised super calculator.
Re: HP Prime Matrix TERRIBLE bug and question  Michael de Estrada  11252013 Don't buy it. It will drive you crazy. See my new post above.
