Can anyone help with ploting the movement of the body along the segment AB, BC this task?

Download sol_Maple.mw

Hi there.

How supress this warning in Maple 2020 when I use "e" just like a variable not an exponent:

Warning, if e is meant to be the exponential e, use command/symbol completion or palettes to enter this special symbol, or use the exp function

?

Thank you

Hi there.

I found bugs in covariant differentiation of vectors that defined in another coordinate system. I attached three documents - two of them with bugs and one with normal behavior.

In cov_diff_bug_1.mw I defined Killing vector in Minkowski spacetime. Then I transformed metric and this vector to spherical coordinate system and calculated covariant derivative of vector and obtained symmetric tensor matrix. But for Killing vector it should be antisymmetric.

In cov_diff_bug_2.mw I set metric in spherical coordinate system by hand instead of transformation and obtained zero covariant derivative.

And in cov_diff_no_bug.mw I set metric and vector by hand without any transformation and obtained normal results - antisymmetric covariant derivative and zero sum of two covariant derivatives with rearranged indexes.

So in Maple 2020 coordinate transformation don't doing well in combining with covariant differentiation. But in previous versions of Maple this behavior could be opposite)

I'm asking developers to consider this issues.

Thank you.

cov_diff_bug_1.mw

cov_diff_bug_2.mw

cov_diff_no_bug.mw

Dears,
Someone to know install modules as pyautogui? 
ImportModule("pyautogui")
In my software gives the following message "Error, (in Python:-ImportModule) ModuleNotFoundError: No module named 'pyautogui' ['Traceback (most recent call last):\n', '  File "<string>", line 1, in <module>\n', "ModuleNotFoundError: No module named 'pyautogui'\n"]"
Or someone know about automation keyboard in Maplesoft?
Kind regards

 Dear Maple community, 
I am struggling with the numerical solution of the complex (linear) partial differential equation to obtain results. For example, I see such as this statement "Error, (in pdsolve/numeric/plot) unable to compute solution for t<HFloat(0.0): signum is not differentiable at complex values" pops up. I did my homework but I didn't get anything. I will be happy if someone could give me some suggestions or advice. Thank you in advance. 

Hi, need help with ploting task. Could someone help with this?

Task:

The svg generated by Export, for example, 

svg_code := Export(plot(x), target = direct, format = "svg");

is broken (the svg generated is invalid). 

Is there a fix for this issue?

If there is no fix, is there a way to output (to be assigned to a variable) a text (ascii) containing base64 encorded png of a plot.

Hello, so my maple won't solve any function involving either cos, tan or sin. Has anyone experienced this before or know how to fix it? 

For example i need to find: cos(30), but it comes up as cos(30) after I hit enter. 

Many thanks to anyone who tries to help! :)

Hi, I have a problem with solution task. Why eq2 doesn't accept value of x1?

restart;
P := 12; M := 6; q := 2; BC := 2; Q := q*BC; CN := (1/2)*BC; NB := CN; AK := 1; KC := AK*evalf(cot((1/6)*Pi)); KN := KC+CN; BK := NB+KN;
                            P := 12
                             M := 6
                             q := 2
                            BC := 2
                             Q := 4
                            CN := 1
                            NB := 1
                            AK := 1
                       KC := 1.732050808
                       KN := 2.732050808
                       BK := 3.732050808

eq1 := x1 = (P*evalf(cos((1/6)*Pi))-Q*sin((1/6)*Pi))/sin((1/6)*Pi);
                    eq1 := x1 = 16.78460970

eq2 := x2 = AK*P+BK*x1+KN*Q+M;
            eq2 := x2 = 3.732050808 x1 + 28.92820323

solve({eq1, eq2}, {x1, x2});
              {x1 = 16.78460970, x2 = 91.56921942}
NULL;
B := vector(2, [(P*evalf(cos((1/6)*Pi))-Q*sin((1/6)*Pi))/sin((1/6)*Pi), AK*P+BK*x1+KN*Q+M]);
        B := [16.78460970, 3.732050808 x1 + 28.92820323]

A := matrix(2, 2, [[1, 0], [0, 1]]);
                               [1  0]
                          A := [    ]
                               [0  1]

C := evalm(1/A);
                               [1  0]
                          C := [    ]
                               [0  1]

x := evalm(`&*`(C, B));
        x := [16.78460970, 3.732050808 x1 + 28.92820323]

Hello everyone. does anyone please correct my worksheet? I
 

Download Method.mw

am trying to solve but could not get the required answer

how I can I get MAPLe to simplify this to Pi/2-beta ,

simplify(arctan(sin(beta)/cos(beta)),arctrig) assuming beta<Pi/2,beta>0;

simplify(arctan(sin(beta)/cos(beta)),symbolic) assuming beta<Pi/2,beta>0;

why i can't get Pi/2-beta

https://www.mapleprimes.com/questions/219048-Help-File-Edit-After-Storing-In-A-Database

I found a previous post which contained a worksheet script for creating help, but this example is likely out-of-date. Can anyone provide a similar example for post-2018 help files to save me considerable trial and error.

I want to open an external *.XML file and put this information in a list (every part is a row). Later, i will change a specific row with other text. Finally, I want to copy all this changes in the same file (rewrite the file).
Someone to help me?

> den := -(-(conjugate(chi)-conjugate(phi))*(chi+phi)*conjugate(lambda)+lambda*(conjugate(chi)+conjugate(phi))*(chi-phi))*(-(conjugate(chi)+conjugate(phi))*(chi-phi)*conjugate(lambda)+lambda*(conjugate(chi)-conjugate(phi))*(chi+phi));

> phi:=exp(I*lambda*(x-t/(4*lambda^2)-w^2)):chi:=exp(-I*lambda*(x-t/(4*lambda^2)-w^2)):

> den1:=simplify(dsubs({phi,chi},den));

> dsubs({exp((1/4*I)*(4*lambda^2*w^2-4*lambda^2*x+t)/lambda), exp(-(1/4*I)*(4*lambda^2*w^2-4*lambda^2*x+t)/lambda)}, 4*conjugate(lambda)^2*cos((1/4)*(4*w^2*lambda^2-4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda+t)/lambda)^2-4*conjugate(lambda)^2*cos((1/4)*(-4*w^2*lambda^2+4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda-t)/lambda)^2+8*abs(lambda)^2*cos((1/4)*(4*w^2*lambda^2-4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda+t)/lambda)^2+8*abs(lambda)^2*cos((1/4)*(-4*w^2*lambda^2+4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda-t)/lambda)^2+4*cos((1/4)*(4*w^2*lambda^2-4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda+t)/lambda)^2*lambda^2-4*cos((1/4)*(-4*w^2*lambda^2+4*x*lambda^2+conjugate((4*lambda^2*w^2-4*lambda^2*x+t)/lambda)*lambda-t)/lambda)^2*lambda^2-16*abs(lambda)^2)

Since "cos(...)" appears in every term in last equation (except a last one), how to common it? 

The  galois routine returns the group of  polynomials within quotation marks, e.g.  "6T1".

How to convert  things like  "6T1"  into just   6T1, i.e. how to get rid of the quotation symbols?