From: Roman Hartmann on 18 May 2007 07:35 Hi, I'm trying to solve a system of equations with MSLV and am wondering if I can tell MSLV to use some boundaries for certain variables. Example: D=a*E^b*exp(c*E) I know 3 values for D and I know that a > 0, 0<b<1 and c<0 and I'm trying to get the values of a, b and c. E is a number and not the e^xfunction. In RPNmode I did the following: ['19.675=a*1.35^b*e^(c*1.35)' '44.05=a*2.83^b*e^(c*2.83)' '31.49=a*3.3^b*e^(c*3.3)'] ['a' 'b' 'c'] [10 .9 0.1 ] MSLV Usually that does work nicely if the start values are not too far off but in this case the equations with the e^x in are a bit too much for MSLV (BTW, I'm trying to solve that on a HP50G). 'assume(a>0)' seems to influence only the CASsettings but does not seem to help the numeric solvers. Is there a way to make MSLV use boundaries for certain variables? Or is there maybe a third party application which does what I'm looking for? PS: Don't bother to solve the example above for me as I already have all the numbers I need to draw the curve (for those who try anyway: take care as MSLV is a real battery hog ...). I just would like to be able to use the HP50G to draw a curve to check my results quickly. I don't have the time to simplify the equations with substituting unfortunately. PS2: For some reasons variable b in the given example isn't between 0 and 1. MSLV reports it to be 7.26.. Could be a units problem in my particular example or just wrong data. best regards Roman
From: Roman Hartmann on 18 May 2007 14:29 Roman Hartmann wrote: > Hi, > I'm trying to solve a system of equations with MSLV and am wondering if > I can tell MSLV to use some boundaries for certain variables. ..... Ok, seems what I was looking for is SolveSys by Sune Bredahl (was actually already installed on one of my old HP49Gs). Works like a charm. Great stuff Sune! Roman

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