I have in internal procedure ppp that has an input prjpsn:=3. This set a Vector positions of x,y,z to either if prjpsn=1 

zpsn=1,   xpsn=2,  ypsn=3

or if prjpsn =3   

xpsn=1,   ypsn=2, zpsn=3

This then are used in another procedure. I can't get the values to transfere.  prjpsn would default to 3 in the module but can be set externally to 1 if needed.
The relevant parts are highlighted in green text. Cant get the worksheet to display.

Maple Worksheet - Errorprjpsn:=3


Failed to load the worksheet /maplenet/convert/Q_14-12-22_Module_internal_settings.mw .

Download Q_14-12-22_Module_internal_settings.mw

How do I calculate the conformal killing vectors of a metric tensor in GRTensorIII?

Why I get "Error, invalid subscript selector" error in my code?

y1 := Grid:-Seq(UP1(s, U, V, W, Phi, Xi, N, a, b, II, JJ, A, B, Dd, M, Ns), s = 1 .. 7);
UKt := add(y1[i], i = 1 .. 7);

Error, invalid subscript selector

As you can see y1 is defined without any problem and have 7 seqments, but the next line warns invalid subscript selector.

I have, for example,

> x(t) := sin(a)*cos(t) + cos(a)*sin(t)
            x := t -> sin(a) cos(t) + cos(a) sin(t)
> y(t) := combine(x(t))
            y := t -> combine(x(t))

>y(t);
            sin(a + t)

> x(t);
            sin(a) cos(t) + cos(a) sin(t)

# wanted but cannot do this: x(t) := combine(x(t))

Any workaround?

Thanks.

why does the command Matrix(2, 2, undefined) create the following

Matrix(2, 2, [[undefined(1, 1), undefined(1, 2)], [undefined(2, 1), undefined(2, 2)]])

instead of simple undefined for each item?

Example: After manipulating the following indefinite integral

Int(r^2, m)

I want to add ranges before evaluating the integral (for display purposes I keep the innert form). The op command or the IntegrationTools can be used for that (disassembling the expression and assembling it to new int expression) but require quite long code. Isn’t there a shorter  way to simply add ranges to the integration variable.

Update: Download Add_range.mw

Hi. I'm having a problem with the command phase portrait on maple when i'm trying to make a phase portrait of my autonomous differential equations. The problem is i can't get arrows on my phase portrait to see how the system behave with different intial value conditions, so my questions is how can i add arrows to the phase portrait? See below for a image of my code

Let a, b, c, d be real numbers. Define two geometric regions implicitly: a＋b＋c＋d＞0∧ab＋ac＋ad＋bc＋bd＋cd＞a²＋b²＋c²＋d², and abcd＞0∧abc＋abd＋acd＋bcd＞0. Suppose that somebody wants to prove that the former region is a subset of the latter one. Can we implement such an implication simply using certain ready-made commands in basic Maple? In other words, it is hoped that 

restart;
RealDomain:-simplify(forall([a, b, c, d], a + b​​​​​​​ + c + d > 0 and a*b + a*c + a*d + b*c + b*d + c*d > a^2 + b^2 + c^2 + d^2 implies a*b*c*d > 0 and a*b*c + a*b*d + a*c*d + b*c*d > 0));

Unfortunately, simplify just returns the statement unevaluated. So, how to address it in internal Maple? 

Note. The desired result (or return value) is true (see below).

1. restart; # Do not with(Logic): here
   RegularChains:-SemiAlgebraicSetTools:-QuantifierElimination(&A [d, c, b, a], ((d + c + b + a > 0) &and (b*a + c*a + d*a + c*b + d*b + d*c > a^2 + b^2 + c^2 + d^2)) &implies ((d*c*b*a > 0) &and (d*c*b + d*c*a + d*b*a + c*b*a > 0)));

2. restart;
   not SMTLIB:-Satisfiable(`not`(a + b + c + d > 0 and a*b + a*c + a*d + b*c + b*d + c*d > a^2 + b^2 + c^2 + d^2 implies d*c*b*a > 0 and a*b*c + a*b*d + a*c*d + b*c*d > 0)); # assuming real 

​​​​​​​​​​​​​​​​​​​​​Either ⒈ or ⒉ needs external calls. It seems that the Maple standard library functions in List of Commands still fail in simplifying expressions in the aforementioned form. Am I right?

Can Maple prove this simple identity  binomial(2*n, n)/2 = binomial(2*n-1, n-1) ,where n is integer and positive. Doing it manually is very easy. My attempt was unsuccessful:

is(binomial(2*n, n)/2=binomial(2*n-1, n-1)) assuming n::posint;

                                                       FAIL

File:

Solution_Methods.mw

Download Solution_Methods.mw

So i have an exam right around the corner, and maple decided to corrupt my file. I get the error "There was a problem in the loading process, you worksheet may be incomplete." I've tried the following troubleshooting:

Restart - No luck

Other computer - No luck

Checked the backupfolder. - 10 backups have been made, but they are all corupt aswell

I've Followed Can I repair a corrupted Maple document/worksheet file? (maplesoft.com) It didn't really do anything

Also tried the DeleteBadCharacters() proccess, but i get the error "Error, (in XMLTools:-ParseString) Element type "Equation" must be followed by either attribute specifications, ">" or "/>"."

Anyone who can help me out here? 

Please Help! I am a beginner in using maple, I am getting  error in theta(k+2).How to get  m1,m2,m3 values from theta(k+2) and how to plot a curve theta(eta) like,f(eta). pp_DTM.mw

Download pp_DTM.mw

Hi there,

I updated to Maple 2022 recently. One problem I am facing is how after I write the code and get the output, which can be text or equations or plots, etc, when I try to copy it to MS Word for example, I don't have the option of "Copy as Image" anymore. This option was available in previous versions. So was it taken out in this version? If yes, what's a subtitue for that?

I am using Maple for a school project and need to be able to copy the 2D output to MS Word just like the previous versions of Maples did.

Regards

I'm trying to get familiar with the Physics package. It's huge.  Since I know vector projection, I can guess what a projected vector might be. But what would a non-projected vector be in a physical context? 

A web search for non-projected vectors was unsuccessful.

My best guess is that non-projected vectors in Maple are those where no coordinate system is specified for vectors in an expression for a physical law. Like here in Maxwell equations. Am I correct?

To distinguish between these vectors the Physics[Vector] package uses an underscore “_”.

If my understanding is correct so far, I have three questions:

• Can I replace the unit vectors of implemented projected vectors to something else (e.g. _i to e__x)
• Is it possible to define projected vectors beyond what is implemented in Maple?
• Can I use the packages VectorCalculus and Physics[Vector] at the same time?

Hi friends

Could you please give hints to solve the integral

int(exp(I*k*x)*sech(x),x=-infinity..infinity)

Thanks