Question about MROOT function Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 11-08-2011, 12:17 PM Hi All RPL experts! I am trying to see how an HP-50G can find the roots at least two simultaneous nonlinear equations. Does the function MROOT do the job. If so, how does one use it? Namir Crawl Senior Member Posts: 306 Threads: 3 Joined: Sep 2009 11-08-2011, 01:42 PM Use MSLV. The manual is here: http://www.ele.uri.edu/faculty/vetter/Other-stuff/HP-calculators/HP-50g/HP_50g_advanced_users_reference_manual.pdf Bart (UK) Posting Freak Posts: 850 Threads: 10 Joined: Mar 2009 11-08-2011, 02:17 PM See here for the AUR with linked contents, index and bookmarks:Bookmarked version of the HP-50G AUR PDF Marcus von Cube, Germany Posting Freak Posts: 3,283 Threads: 104 Joined: Jul 2005 11-08-2011, 02:31 PM Quote: Multiple Roots Command: Uses the multiple-equation solver to solve for one or more variables using the equations in EQ. Given a variable name, MROOT returns the found value; with "ALL" MROOT stores a found value for each variable but returns nothing. Does this answer your question, Namir? Hal Bitton in Boise Senior Member Posts: 291 Threads: 43 Joined: Jun 2007 11-08-2011, 11:15 PM Hi Namir, After trying (unsuccessfully) to make this function work, I'd be very interested in finding out how it's done as well. The (skimpy) AUR documentation makes no reference as to how the equations are to be stored in the EQ variable...(as a list, a vector, or what?). I tried both of the above to no avail. I got either "bad argument type", "bad argument value", or just my 2 equations regurgitated onto the stack, as results. Can somebody post an example using this function? Best regards, Hal Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 11-09-2011, 12:01 AM My attempts to use MSLV have failed!!! I must say that TI does a MUCH BETTER job with the TI NSpire CX CAS. The machine makes it soooo easy to define how many equations, declare the variable names, and then enter the equations. You can optionally assign initial guesses AND specify the range for the solutions. My guess is that this is the work of an ex-HP employee. Namir Edited: 9 Nov 2011, 7:22 a.m. Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 11-09-2011, 12:02 AM Bart, Thanks for the bookmarked version of the AUR manual. I know it is a lot of work to add the bookmarks. Namir Edited: 9 Nov 2011, 7:23 a.m. Crawl Senior Member Posts: 306 Threads: 3 Joined: Sep 2009 11-09-2011, 07:26 AM What's the problem? Crawl Senior Member Posts: 306 Threads: 3 Joined: Sep 2009 11-09-2011, 07:52 AM Anyway, I made an animated GIF of me using MSLV once: First enter the equations, then the variables, then the initial guess. Those are all entered as row vectors. Eddie W. Shore Posting Freak Posts: 764 Threads: 118 Joined: Aug 2007 11-09-2011, 09:18 AM Quote: Hi Namir, After trying (unsuccessfully) to make this function work, I'd be very interested in finding out how it's done as well. The (skimpy) AUR documentation makes no reference as to how the equations are to be stored in the EQ variable...(as a list, a vector, or what?). I tried both of the above to no avail. I got either "bad argument type", "bad argument value", or just my 2 equations regurgitated onto the stack, as results. Can somebody post an example using this function? Best regards, Hal Use STEQ to store the equation. It is in the catalog or it can be typed. Eddie W. Shore Posting Freak Posts: 764 Threads: 118 Joined: Aug 2007 11-09-2011, 09:21 AM Quote: Anyway, I made an animated GIF of me using MSLV once: First enter the equations, then the variables, then the initial guess. Those are all entered as row vectors. So the syntax is: 3: [vector of equations] 2: [vector of variables] 1: [vector of guesses] Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 11-09-2011, 10:29 AM Very nice!! I will try again!! I know the HP-50G is a very capable machine. It should be easy to solve the multiple roots for two or three nonlinear equations. Namir PS: It worked. I realized my mistaked. Here is the example: ```x*y-4=0 x^2+y^3-31=0 ``` I entered the following: ```['X*Y-6','X^2+Y^3-31'] ['X','Y'] [5 5] ``` Originally I was leaving out the single quotes and getting syntax error messages from the machine. When I made the correct input and then executed MSLV, I watched the machine update the guesses for the roots (at the top of the LCD) as they converged to the solutions x=2 and y=3. Thanks!! Edited: 10 Nov 2011, 5:02 a.m. after one or more responses were posted Hal Bitton in Boise Senior Member Posts: 291 Threads: 43 Joined: Jun 2007 11-09-2011, 11:12 AM Well, certainly MSLV has been de-cloaked and shown to work very well. The function that remains shrouded in mystery, however, (at least in my mind) is MROOT. What's the difference between MSLV and MROOT? I have a feeling they do the same thing, but accept inputs differently. Has anybody gotten MROOT to work? HB Crawl Senior Member Posts: 306 Threads: 3 Joined: Sep 2009 11-09-2011, 12:09 PM I don't have my HP50g here to test this with, but I don't think I do it with the "entering quotes" method. I'll probably go to Matrix Writer to enter the vectors, and from there Equation Writer to enter the equations (or if you prefer RPN, build up the equations on the stack, then copy and past them into Matrix Writer). I think the Matrix Writer defaults to Vectors (if it's 1xn or nx1), so if you enter them on a row, the syntax should work itself out for you. Also, (2,3) doesn't solve x*y-4=0... Software49g Member Posts: 83 Threads: 14 Joined: Sep 2011 11-09-2011, 02:16 PM Hello, > Has anybody gotten MROOT to work? MROOT is used in HP's EQNLIB and in mine through GUIMES. It is explained in the original documentation of HP's EQNLIB and in my documentation to GUIMES. HTH, Andreas http://www.software49g.gmxhome.de Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 11-10-2011, 05:03 AM Ooops! That was a typo. I meant: X*Y-6=0 I corrected that in my original message. Namir « Next Oldest | Next Newest »

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