HP Forum Archive 21

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[WP34S] Once Working TVM Now Broken Message #1 Posted by Les Wright on 7 May 2012, 1:15 a.m. The TVM library routine was working very well thanks to improvements to the solver, but when I revisited tonight for the first time in a couple of weeks it throws an "Out of Range" error whereas once it gave a correct result. My test problem is basically a mortgage of PV = 153295, FV = 0, PMT = -976.25, with N = 300, NP = 12, NI = 2. The correct interest rate is around 5.95%/yr, which the program used to spit out to high accuracy. Now the solver proceeds very quickly to the error noted. I'm baffled. I am using the latest version, and I can produce this on the real calc and the emulator. Just thought I would share this to see if anyone else can reproduce it. Les Edited: 7 May 2012, 4:50 p.m. after one or more responses were posted

Actually, SLV itself is the culprit Message #2 Posted by Les Wright on 7 May 2012, 1:46 a.m., in response to message #1 by Les Wright The solver itself is broken in general. Attempting to solve even the basic x^2-2 = 0 equation with guesses 1.4 an 1.42 on the stack generates the Out of Range error. Hope this helps, Les

Re: Actually, SLV itself is the culprit - fixed Message #3 Posted by Marcus von Cube, Germany on 7 May 2012, 2:30 a.m., in response to message #2 by Les Wright We'll have a look. Edit: I did have a look. My shame. :-( I wonder why this hadn't surfaced earlier. It was a typical "always" against "never" programming mistake. Edited: 7 May 2012, 3:24 a.m.

Re: Actually, SLV itself is the culprit - fixed Message #4 Posted by Les Wright on 7 May 2012, 1:01 p.m., in response to message #3 by Marcus von Cube, Germany Glad it was fixed. Looking at the SVN comment I am surmising it was a a pretty basic issue that could have implications whenever POPUSR was called in XROM. Nice to see my beloved TVM back to normal. Les

Re: Actually, SLV itself is the culprit - fixed Message #5 Posted by Walter B on 7 May 2012, 1:45 p.m., in response to message #4 by Les Wright Glad you like it. Was hard work to get it in the function set over a year ago :-)

Re: Actually, SLV itself is the culprit - fixed Message #6 Posted by fhub on 7 May 2012, 2:04 p.m., in response to message #5 by Walter B Quote: Glad you like it. Was hard work to get it in the function set over a year ago :-) And whose work was it?

Re: Actually, SLV itself is the culprit - fixed Message #7 Posted by Marcus von Cube, Germany on 7 May 2012, 2:07 p.m., in response to message #6 by fhub Yours. Appreciated! WP 34S is a real group effort. :-)

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