HP48 vs HP50 solver

[JurgenRo]

I am currently re-reading Bill Wickes HP48 Insights books. I noticed that the numerical solver of the HP50 seems to have been downgraded compared to the HP48. Example:

1. if 'EQ' contains a list of equations {EQ1, EQ2, EQ3, ...}, these can be loaded from the solver in both machines, but only in the HP48 can these equations be “switched through” in the solver. In HP50 apparently only EQ1 is considered.

2.the HP48 solver can be modified by adding lists, so {' EQ1' {“A” <<' expression'>>} {'B' <<' expression'>>}} generates the usual solver menu plus the additional softkeys A (white on black) and B (black on white), with which the corresponding expressions can be executed. The HP50 seems to simply ignore these additional lists.

Is there any reason for this downgrade?

[BruceH]

Have you looked at the multiple equation solver in the Equation Library? (APPS, 12, 3)

You use the MINIT command to create the system variable MPar from EQ and then use MSOLVR to solve them. I don't have a link to a tutorial to hand but if you can't find something searching for HP50G and MPar then ask again and I'm sure someone will have something.

[JurgenRo]

(10-28-2024 06:13 PM)BruceH Wrote:  Have you looked at the multiple equation solver in the Equation Library? (APPS, 12, 3)

You use the MINIT command to create the system variable MPar from EQ and then use MSOLVR to solve them. I don't have a link to a tutorial to hand but if you can't find something searching for HP50G and MPar then ask again and I'm sure someone will have something.

That sounds logical. I will try it out. Many thanks for the tip!

[Marco Polo]

HP50g ROM 2.15
Point 1 works as expected
Point 2 fail with "bad argument value" error. It eventi fails on my 48gx

[JurgenRo]

(10-29-2024 07:06 AM)Marco Polo Wrote:  HP50g ROM 2.15
Point 1 works as expected
Point 2 fail with "bad argument value" error. It eventi fails on my 48gx

Same ROM here, but different behavior. That's strange. I'll give it another try on the weekend, maybe I missed something.

[tollkin]

For the HP50 solver, there is very good video.
How to Solve Any System of Equations with the HP-50G
In this example(s) the equations are placed in an array ->array

[avsebastian]

(10-29-2024 08:16 PM)JurgenRo Wrote:  

(10-29-2024 07:06 AM)Marco Polo Wrote:  HP50g ROM 2.15 erase files
Point 1 works as expected
Point 2 fail with "bad argument value" error. It eventi fails on my 48gx

Same ROM here, but different behavior. That's strange. I'll give it another try on the weekend, maybe I missed something.

are there files in CASDIR menu?

my hp 50g,, does not solve inequalities; but erase files in CASDIR, and work.

[JurgenRo]

(10-29-2024 08:31 PM)tollkin Wrote:  For the HP50 solver, there is very good video.
How to Solve Any System of Equations with the HP-50G
In this example(s) the equations are placed in an array ->array

Just to be clear: it's not about solving a system of equations, it's just about being able to scroll through a list of equations to be solved. The individual equations are independent of each other.

[JurgenRo]

(10-30-2024 04:39 AM)avsebastian Wrote:  

(10-29-2024 08:16 PM)JurgenRo Wrote:  Same ROM here, but different behavior. That's strange. I'll give it another try on the weekend, maybe I missed something.

are there files in CASDIR menu?

my hp 50g,, does not solve inequalities; but erase files in CASDIR, and work.

Interesting. But, no, the Equations are located in the HOME directory, no entry in CASDIR.