mapleatha

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6 years, 27 days

MaplePrimes Activity


These are replies submitted by mapleatha

@acer 

I can't believe you, acer? Can't you see that it does whatever it pleases with the order of the factors in the denominators?
Who knows what it will do with fractions and sums of fractions with 10 factors. Hahahaha!
We need the order of terms in the sums because we want to manipulate those terms much further. That is how you also teach partial fractions. You don't give the students any order Maple gives you as an answer. By replacing things with RTABLES many thngs get straightened out. Not only sums from partial fraction decomposition. I gave you a triival idea as to how you use RTABLES. This is the end of this entire discussion.
 

@acer 

Here is a reply to my message of 2017 by "vv 8008"

In Maple it is difficult to control the order of the terms in a sum (the sort command is mainly for polynomials).  
Maple does this for efficiency reasons; after all it was designed for computations rather than typesetting (where LaTeX is anyway the preferred tool by mathematicians).

In recent versions it offers however many typesetting options (see ?Typesetting).

@acer 

HERE:

@acer 

Are you actually saying, after all those years of experience, that Maple does not change the order of things?
You must be kidding. I have written programs in Maple that will give me 1000 partial fraction decompositions
in a few seconts with all kinds of messed up orders that you can imagine. My specialty is differential equations and this is where most of my reasearch is. Are you going to apologize to me when I give you acceess to all those messed up orders?
mapleatha

@acer 

Here is one more:

print(RTABLE(1,Matrix(2,2,[[1-lambda,1],[1,-lambda]]))*RTABLE(1,Matrix(2,1,[u[1],u[2]]))
=RTABLE(1,Matrix(2,2,[[-1,1],[2,-2]]))*RTABLE(1,Matrix(2,1,[u[1],u[2]]))*` = `*RTABLE(1,Matrix(2,1,
[[0],[0]])));

Result:

Any more complaints?

Thank you guys.

mapleatha

@acer 

You disagree? I only answered your reply! """ Perhaps there will be a decent alternative."""

@acer 

I have assigned nothing to RTABLE. I told you: put RTABLE(1,x^2) in your Maple 2013 program to get back x^2. That looks like I have assigned something to RTABLE? New logic?
Here, try this:

RTABLE(1,Matrix([[2,1],[3,4]]));

You get the matrix back. I gave you two examples. How many do you want?

mapleatha

@acer 

 

acer,

You are trying to replace RTABLE by other instructions, but this is not what
I am looking for. There are too many "RTABLES" in my programs.
I need to know what the instruction RTABLE(1,x^2) was replaced by
in Maple 2020. That instruction works just fine with Maple 13. It does not
work with Maple 2020.
If you send me your email address, I will email you a PDF of an .mw file of mine with lots of RTABLES in it.

Thank you, again.

mapleatha

@acer 

Just give me an example where RTABLE is used internally by Maple
but RTABLE was not in the original .mw file. I want to use that .mw file on Maple 2020
to see that it did with RTABLE, because it doesn't accept it in my way. What would it replace it by?
I am not going to upload here one of my .mw files. They are all
long and contain various remarks to myself.
Thank you!

mapleatha

 

@acer 

II sent this maessage up here in 2017: This is what Maple gave me.

I corrected the order of the fractions with RTABLE!!!

@acer 

As I said, I have used it a million times on all kinds of situations in differential equations
and other problems. Maple changes the order of things. Instead of 1/A+1/B+1/C it gives me 1/B + !/C+1/A whenever it pleases.
i use RTABLE and remedy this situation and many others
I know it is an internal command and I know there is no documentation on it.
I found it in the source code of some file, but I don't remember where.
I would be grateful to you to show me one file where it is used without being
explicitly used in the associated program. This way I would know what Maple 2020 did with
it. What exactly it replaced RTABLE by.
Thank you again.

mapleatha

@arcade 

Like people have already remarked, the function you got as a response from Maple is actually a particular solution. Every time you add a solution of the homogeneous problem to a particular solution you get another particular solution. Thus, there are infinitely many particular solutions. So, to isolate yours, just take all the homogeneouls problem solutions out of your Maple response. You most probably seek the one given to you by Undetermined Coefficients Method, Variation of Parameters Method, or the Annihilator Method.

@acer 

Unfortunatel, it doesn't work, Acer. Here is what I tried:

plot(sin(x)*cos(x)+x,x=-2*Pi..2*Pi,y=-6..6,xtickmarks=[seq((i/2)*Pi,i=-4..4)]);
 

Thank you!

Maplaeatha

 

 

@acer 

Thank you, Acer!

Mapleatha

@Carl Love 

Thank you Carl. This is the answer that I knew about up here. I will try to define the possible polynomial
functions as you suggested, and then use them (print them) ready.
Thanks again.
mapleatha

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