Does anyone know an easy way to convert %d_ to D? I tried the convert command, but no effect.  Thanks.

Michael

Hi!

For my lecture advanced dynamics, I got the question to make a sketch of the coordinate system and the particle’s motion, with the following position vector:

r(t) = (a cos(ωt))i + (b sin(ωt))j + (ct)k

In this function, ω is in [rad/s], a and b are in [m], t in [s] and c is [m/s].

I have no idea what this should look like, and I was thinking about plotting this with Maple, but thus far I'm not succeeding in plotting it. Which function or method can I use to visualize this in Maple?

Thanks a lot!

Hi all,

I have this system

> system2hD := 0 = -d[1, 2], 0 = -d[2, 1], 0 = -delta*d[1, 2], 0 = -d[1, 1]-delta*d[1, 1], 0 = -delta*d[1, 1]-d[2, 2];
> solve({system2hD, delta <> 0, delta <> 1}, {d[1, 1], d[1, 2], d[2, 1], d[2, 2]});
      {d[1, 1] = 0, d[1, 2] = 0, d[2, 1] = 0, d[2, 2] = 0}

But, I hope to get the answers as {d[1, 1] = -delta*d[1, 1], d[1, 2] = 0, d[2, 1] = 0, d[2, 2] = -delta*d[1, 1]}. I think, I should not use the command "solve".

Can someone please advice and hepl me on this?

thanks

witribm

Hello all,

Yesterday, I upgraded to Mac OS X El Capitan.

Now, when working with Maple 2015, I feel the gui is very slow and sometimes irresponsive, when trying to scroll through my worksheets as well as through help pages (e.g., "help plot3d"). When I do the same within Maple 18, it works without any problems.

Does anybody else have the same issue?

Cheers,

Franky

Below is a calculation with 200 Volt and 100 Ω.
The output is 1 Ampere at -45 degrees.
This is useful for electrical circuit calculations, and I can get the right result on a TI-nspire.

However I can't make maple 2015 do it. It's resembling polar coordinates but I can't seem to find any info I can understand.

"((200&angle;0&deg;))/((100&angle;45&deg;)+(100&angle;45&deg;))=\

1&angle;-45&deg;"

below is the same equation but in a picture so it can be read by humans:

http://imgur.com/3i2Su0B

Hopefully theres some simple comands that can help make this easy.

Thanks

For example, I have a commutation table of finite Lie algebra. I'd like to extract some information from it (mainly, I'm interested in maximal dimension of abelian Lie subalgebra).

if eval(simplify( subs(a=2,subs(b= 5,f))))) - n = 0 then

      hello := union(hello, {f})

end if:

after subs(a=2,subs(b= 5,f))) to verify , some of hello return -n

negative

why it is possible to pass the if condition statement?

if it is normal case, how to write correct if statement to ensure no -n 

I want to plot a cone in 3-d for any given axis vecttor, center and eccentricity.

Hello everybody

In the following attached file, I have used "fnormal" command to omit small numbers that are less than "1e-6" but when I run the maple, I see the numbers such as 2.10^(-11). What's the problem?

Thanks in advance.

Lin1.mw

Hello everyone, 

I'm currently taking a Chaos and Fractal Geometry class that did not have a pre-req of computer programming or knowledge of Maple, but I am apparently the only person in the class who has not taken a class/does not have this knowledge so my professor really flew by teaching the material. My sob story aside, I was hoping you great people would be able to help me out with (what are apparently) really basic procedures and plots while I try to read up on how to actaully do it myself (if anyone has a good supplement to recommend, I'm all ears!). Anyway, here are the one's that I'm stumped on:

• "Write a Maple proc L that takes as input two lists and returns as output a set containing the terms they have in common (not necessarily in the same position). For example, L([1, 3, x, 5],[2, x, 5, 2, 1, 8]) should return [1, x, 5]."
  I'm thinking this is going to use some form of the intersection command, but I cannot for the life of me figure out how to set up the syntax
• "Write a Maple program that implements the Euclidean algorithm to compute the gcd(x, y) for any natural numbers x, y (except x = y = 0). Your program should not just compute the gcd, but should do so by implementing the Euclidean algorithm directly (i.e. proc(x,y) RETURN(gcd(x,y)) end; is not what I am looking for here! :) )."
  If only he would've let me do the easy one :(
• "Write a Maple program to plot the Pythagorean spiral. The program should take a single positive integer n as an argument and plot the spiral until the side of length n is reached"
  Not even a clue on how to approach this one. 

Thanks again to any and all help/recommendations you can make. I really appreciate it!

Hi there

I use Maple13 for plotting the surface of revolution of y=x^2 around the line y=1 on the interval [1,2]. But the distance between the surface 

and the vertical axis is ignored while there must be 1 unit distance.please specify the correct command.

Thanks for your cooperation

Regards

M. R. Yegan

Hi, 

What I want is quite simple but I have not seen it implemented anywhere yet. 

I have an explicit map F from the plane into itself. (not an ODE but simply a map) 

Then I have a set X, (something like a line segment or a rectangle in the plane) for which I 

really need to keep track of the images $F(X), F^2(X), F^3(X)$, and so on.

Is there a way to plot the image of a set in Maple? 

Thank you very much for your interests in the question. 

Hello,

I am a new fellow of maple software.

I am trying to run an example of Poincare package example found in 

http://www.maplesoft.com/support/help/maple/view.aspx?path=examples%2Fpoincare

But when i  wrote the commands found in this site, i got this error:  Error, unable to match delimiters 

The commands  are the following:

> restart;
> with(DEtools, poincare, generate_ic, zoom, hamilton_eqs);
> H := ((p1^2+p2^2)*(1/2))*((e^(2*q2+2*sqrt(3)*q1)+e^(2*q2-2*sqrt(3)*q1)+e^(-4*q2))*(1/24))-1/8;

> poincare('' '', stepsize=.05,iterations=5);
Error, unable to match delimiters 

                                        poincare('' '', stepsize=.05,iterations=5)

I would appreciate any helps.

Miguel 

if input x^2*y+x*y+x

how to output [x^2*y, x*y, x]

Hello those in mapleprimes,

I have a question.

I opened Help and entered diff, for example, to have the explanation of how to use diff.

Whether it is diff or not, is not the problem I want to ask about now. But, what I want to ask is the following.

I cklicked the WS botton at the tool bar of the Help, so that I created the worksheet of the same contents of the help of the diff.

Then, I chose an expression in Calling Sequence. That is,

the first line shows

diff(f,x1, ..., xj)     on the left, and on the right \frac{d^j}{dx_j \cdots dx_I} f (I wrote this in the TeX ways, though

it is written in 2-D math input, actually)

I chose an expression on the right side, and from context menu, which appeared though right clicking of my mouse,

I selected convert to and 1-D math input, through which I changed 2-D math of the worksheet of the help file to 1-D math input.

Then, the expression shown is a strange one:

((&DifferentialD;)^j)/(&DifferentialD;x[j] `...` &DifferentialD;x[`1`]) f;

This is still easier one. As for the third line in the Help, it has a more complicated form as

((&DifferentialD;)^r)/(&DifferentialD;x[k]^m &DifferentialD;x[j] `...` &DifferentialD;x[3] &DifferentialD;x[2]^n &DifferentialD;x[1]^n) f;

Do you know how this way to notate is applied in maple worksheet?

Why does maplesoft use this way to notate expressions limited to the Help pages, if it is limited to the help pages.

Thanks in advance.

taro