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MaplePrimes Activity

These are questions asked by wswain

Good Morning,

    Can anyone explain how the Statistics:-nonlinearfit(Time Vector data points, weight at time t) can be used with a real time based (with units) set of vectors?

    To get the fit for an equation to data of the form A*(1+B)^t   with t being time and the growth in kg/sec  the solver needed to be unitless and I get the coefficents.  Reapplying unit of time blows up the eqn.

   P.S., I think I'm being math obtuse this morning on the units.



I have read a few papers on accuracy and numerical methods to solve problems.  My personal interest is in very stiff DAE equations of state (eos) for gaseous expansions/flow problems in very high differential starting conditions for the convergence to occur in the initial time steps.

A long time goal has been to convert the FORTRAN real*16 floating point DAE solver (initially ran on CRAY) into Maple proc() using arbitrary precision that actually solves at the hardware float ieee precision.

Any reference material on stiff solvers and maple implementation would be great.


Does anyone use maple calculator?


I am trying to use it on my iPad for matrix functions.


I tried standard maple %T for transpose, get an error.  I've tried -1.  No joy.  

I can't seem to find how to assign to a variable, or use indexing to a matrix element.


Any suggestions welcomed for iPad maple functionality. 

Is there a reason that an angle theta from zero to pi/2 (0 to 90 deg) returns as invalid for an animation range?  I am trying to rotate a vector 2D for visualization.  This is build-up towards a 3d rotating vector in an animation.  


Here is the code: theta is the arrow tip rotation's location via cos(theta), sin(theta) coordinates in a 2D vector.


animate(arrow, [<cos(theta), sin(theta)>, width = [0.05, relative], view = [-1 .. 2, -1 .. 2], color = "blue"], theta = 0 .. Pi/2)



Error, (in plots/animate) 0 = 0 .. (1/2)*Pi  is an invalid animation range



Thanks In Advance,


This has always made me wonder everytime I type it.

The first command I always type on a new worksheet is restart.  I don't think I have never done this. 

Is there a reason it needs to be manually entered and how many people DO NOT start a worksheet with a restart?   

Is there a reason to not make this automatic with initial loading of a worksheet?



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