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brian abraham

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18 years, 104 days
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These are answers submitted by brian abraham

branching out with radicals...

brian abraham 634
June 25 2008
0 5

 

Many thanks for your time spent on this.
I have gained an insight but I am trying to understand ‘taking the wrong branch of the radicals’.
Could I trouble you for a simpler function, than mine, for me to explore how the solving of the radicals leads to the signum functions.
Apologies if this is elementary.

Brilliant, many thanks....

brian abraham 634
February 25 2008
0 0

Brilliant, many thanks.

Thank you Robert that is...

brian abraham 634
January 16 2008
0 1
Thank you Robert that is most helpful. I have also followed up the issue of number of regions produced by lines on a plane a and an article can be found on PlatonicDivisionsofSpace

If I might just ask for a...

brian abraham 634
January 15 2008
0 1
If I might just ask for a little more help. I am struggling to understand what is going on in the first section of your code Robert. I have written it out in a little fuller form L := [seq](A[i]*x + B[i]*y - C[i], i=1..8): > CPS:=combinat[powerset]({$1..8}): > P:= map( t -> ( map(`<`, applyop(`*`,t,L,-1) , 0) ) , CPS); But that last line is eluding me. In particular the t in the applyop Thank for all the help so far.

This has been answered in...

brian abraham 634
January 15 2008
0 0
This has been answered in Find a point in every region defined by a system of linear equations

That looks absolutely great....

brian abraham 634
January 15 2008
0 0
That looks absolutely great. Thank you so much Please ignore my other posting - I had not expected further reply

A,B,C,D,E,F are specified...

brian abraham 634
January 09 2008
0 0
A,B,C,D,E,F are specified numbers and not ranges. That is most helpful and clearly explained. Many thanks

Sadly I do not have the...

brian abraham 634
January 08 2008
0 0
Sadly I do not have the Global Optimization toolbox More generally can signum be used with the standard optimisation package as Maple 10 reports 'no iterations performed' when I attemp this.

My actual expression...

brian abraham 634
September 25 2007
0 0
Thank you as always, most informative. My actual expression was of the form A arctan(B/C) where A = -1 or 1, and B and C are variables and not functions. I am glad I did not make that clear at the start; I might have missed some of the discussion!

no op...

brian abraham 634
September 24 2007
0 0
Thank you djc and Doug. I can not quite see how patmatch extracts x from A+B*arctan(x) where x is any expression. Am I missing something? My original interest in this came from a wish to express arctan(A/B) as arctan(A,B) where A and B are any expressions. I should have asked that specfically.

Is Maple 11 the answer?...

brian abraham 634
August 08 2007
0 0
I'm using Maple 10 and find the Classic Interface comfortable. Is the Classic Interface supported in 11?

Thank you. Aren't forums...

brian abraham 634
August 07 2007
0 0
Thank you. Aren't forums brilliant. I managed to figure out the problem in your first posting and used fprintf(fd ,cat(seq( "%a\t", k=1..54 ),"\n") > ,(seq( Par_M[t,k], k=1..56 ) ) ) which seems to do the same thing as your correction.

Many thanks ...

brian abraham 634
August 06 2007
0 0
Many thanks

Thank you one and all. I...

brian abraham 634
August 02 2007
0 0
Thank you one and all. I shall think about converting the final work to Standard

Collapsing and Expanding...

brian abraham 634
August 01 2007
0 0
Thank you but I could not find what I was looking for. I want to execute the whole sheet but prevent certain sections - which contain part of the code - from expanding. It is simply to save the bother having to collapse each section that I don't need to see when I examine the results of the execution. Have I missed something in my reading of the help section?
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