rquirt

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12 years, 324 days

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These are questions asked by rquirt

I'm new to MapleFlow, and I have a few questions about MapleFlow help.

  1. I read the recent post about the release of MapleFlow 2025.2, and it mentions some new functionality and bug fixes.  Is there a "What's new in MaplleFlow 2025.2" section in a help file, online or offline, that lists the new features and bug fixes?
  2. I can find Online Help for Maple, MapleSim and MapleSim Toolboxes, but I can't find a section for MapleFlow.  I realize that MapleFlow and Maple share a lot of functionality, so the Maple section covers the functions, but there are MapleFlow-specific features that don't seem to have their own section in the Online help.
  3. The offline MapleFlow help seems rather dated and limited.  When was the last time any updates were made?  Are there plans to continue to improve the offline MapleFlow help?
  4. I have a few tech support questions in, and I have received some feedback, but at least one has been sent to the Math group for review, and it's been about a week, and I've heard nothing.  Is there somewhere we can check the status of our tech support issues?

Thanks

I have attached a MapleFlow file that shows a result I don't quite understand.  For some reason the FinalValue result that I get using the DynamicSystems:-StepProperties is different than the steady state value from a DynamicSystems:-ResponsePlot to a unit step using a DifferentialEquation object.

You will notice that I played around a bit, including transforming the DiffEquation object to a TransferFunction object, to see if I could make sense of it.  All of the results are the same as the StepProperties result, it appears that only the ResponsePlot for the DifferentialEquation object is different.

Am I doing something wrong?  Does anyone have any ideas?

Dynamic_Systems_Final_Value.flow

I'm doing some experimenting with the Optimization:-Maximize and Minimize functions, and I'm having difficulties getting them to find the actual extrema within a set of bounds.  I have found that the extrema they identify depend on the bounds, even when the same extrema lie within those bounds. I've also tried the initialpoint option to start the solution near the extrema and I've found three things: sometimes it works to get the correct solution, sometimes it doesn't and sometimes I get a message saying the initial point was ignored by the solver.

The problems I'm using are all taken from the Maple help or tutorials.

I haven't included a bunch of test cases but I've attached the Maple Flow file.  I have a suspicion it has to do with the second derivatives of the functions near the boundaries, but I'm not sure.

Can anyone point me to more information, or am I doing something wrong?

Thanks for your help.

Optimization_Local_Max_and_Min.flow

I have a problem where there is a true deadtime due to a transport delay.  The delay is in the order of 8 minutes as a fluid flows very slowly down a tube.

I've fit an expression to some measured data and have found the following expression

I'd like to work with this using the Dynamic Systems Package, so I'm trying to build a system from the time-domain expression.  When I try to use the inttrans:-laplace function to convert to the s-domain, I get an overflow.  If I manually express this as a Laplace transform and try to make a system and do a step response, I get this, with an error that "transfer function(s) are not rational-polynomial(s) in s"

Is a delay supported in the Dynamic Systems Package?  If so, could you provide guidance on how?

I tried this combination of transfer functions, and it appears that the PhasePlot isn't correct.  Does anyone have any suggestions on what might be causing the issue? 

What_do_I_have_wrong_Phase_Plot.zip

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