# MaplePrimes Questions

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### How I can separate real and imaginary parts in PDE...

Yesterday at 7:48 AM
1 1

Suppose I have a PDE

 >

Here I can set

Then my query is, how can I obtain simplified resultant system after equating real and imaginary parts. Of course there would be two partial differential equations in and  and those can also be written down manually very easily but this process becomes difficult when we have large system.

Regards

### Why Maple doesn´t give two solutions...

Yesterday at 6:23 AM
1 2

Hi every one,

I am using Maple 7 because I am running Windows XP

I believe this equation:

> solve( 1.15=exp(-xi*Pi/(sqrt(1-xi^2))), xi);

has two solutions: xi=+0.4444364945e-1 and xi=-0.4444364945e-1

but Maple only gives -0.4444364945e-1

Why?? And how can I get the two solutions?? Thanks before hand by your comments.

### view source of a webpage using Maple...

July 24 2016
0 9

I'm trying to view the source of the webpage fuelsonline.ca

I used HTTP[Get] like I did before which doesn't retrieve much of anything useful.  I thought of the sockets package which I can't seem to pull any information from.  Then I had an idea and viewed the page source which finally has information I can use if I can get Maple to read it in.  If I can get Maple to pull in the contents of the page source I should at least be able to carry it from there.

Any ideas from anyone?

### "solve((x+exp(-1))^x = 1, x)" gives error...

July 24 2016
1 2

The code "solve((x+exp(-1))^x = 1, x)"gives the error "Error, (in Engine:-Dispatch) invalid subscript selector". How is this possible?

### Adding a term, then subtracting the term....

July 24 2016
0 2

Hello people in mapleprimes,

I have an equation called aa in the following.

alias(&delta;x=dx, &Delta;x=Dx,&Delta;y=Dy,&Delta;z=Dz):
aa:=Dz=f(x+Dx,y+Dy)-f(x,y);

As for modification of this expression, I ask your favor to teach me.

Then, I want to change this aa to D[1](f)(x+theta__1*Dx,y+Dy)*Dx+D[2](f)(x,y+theta__2*Dy)*Dy.

But, to do so, I have to split aa into the one including -f(x,y+Dy)+f(x,y+Dy) between two terms

of aa.

But, as maple cancels these terms, I can't do so. How can I insert two terms, then

obtain the expression  D[1](f)(x+theta__1*Dx,y+Dy)*Dx+D[2](f)(x,y+theta__2*Dy)*Dy?

taro

### how convert 3 couple equations to 1 equation...

July 23 2016
0 2

hi...how i can convert 3 couple equations to 1 equation with Placement each other?

thanks...

 (1)

 (2)

 (3)

### %Zm format: How is it used with GUI and DocumentTo...

July 22 2016
0 4

I've read the help page ?printf for the format codes many times over the years. I think that this is new:

The Z modifier, "%Zm" can be used to generate an alternate equivalent dotm representation that is used in communication with the GUI and in DocumentTools related functionality for the creation of XML content for .mw files.

Could someone show me an example of that?

### Eigenvalues of Laplacian matrix...

July 22 2016
1 3

i am working on laplacian eigenvalues of some special graphs and when i want to find  min([laplacianEigenvalues]) then i alltime see same error code, [Error, (in simpl/min) complex argument to max/min...]

my aim is write a procedure about Algebraic connectivity

### Maple Evaluating More Than 12 hrs...

July 22 2016
1 9

Hello, I run Maple to solve Binary Integer Programming problem which contain about 1340 constraint and its goal to maximize the objective function.

At first, it's running for 2 hours and said that the iteration limit was reached. So I try to add 'iterationlimit' at LPSolve opts and set it to 10000, but after 3 or 4 hours it said that the iteration limit was reached. So I set 'iterationlimit' to 100000000 and now Maple keep evaluating more than 12 hours.

I run Maple at my notebook with these spesification:

Processor: Intel Corei3-5005U 2.0 GHz

Memory: 4GB RAM

Windows 10

It is normal? Or I must run Maple in higher notebook spesification?

Below is my Maple file, hope you can help me.

ISL_2017_FASE3.mw

### How to import/generate a file of numerous matrices...

July 22 2016
1 2

I want to analyze the runtimes on certain Linear Algebra functions in Maple, so I need a (large) set of matrices to input into these functions.

I have written the below code, which does succesfully generate a file of matrices:

The resulting file looks like:

However, I am unable to read the matrices from this file back into Maple. When using the code below, I get an error.

I think the error is that %a in fscanf scans up to the next whitespace, so the spacing in Matrix(3, 3, [[9,1,-4],[-5,6,-10],[-10,-4,-4]]) is throwing fscanf off. Do you guys know of any way I can fix this?

Or, is there a better way for me to generate these matrices so that they can be easily read into Maple? I've considered using ImportMatrix/ExportMatrix, but I believe that they only work for a single matrix, not the numerous ones that I would need.

### How do I connect 3 arms to a single part with revo...

July 22 2016
1 0

I have created a model for a robot in Solidworks and have imported it into Maplesim using the CAD toolbox. The problem I have is that the robot has 3 arms that are supposed to come together on a central piece pictured below in figure 1, but attempting to simulate the model with all arms connected with a revolute joint as in figure 2 yields an error that says "The system is underdetermined" the location of the error is main.

For the purposes of the image below I only connected one of the arms, this allows Maplesim to run the file successfully.

figure 1 showing the central piece that the 3 arms are supposed to connect to.

Figure 2 showing the problem revolute joints circled in black, the error at the bottom and the setting of the revolute joint on the right.

Essentially my question is how do I get the model to work? I apologise if this problem is not terribly well demonstrated, this is my first post onto this forum so I am not sure of all the standards.

### generate graphs ...

July 21 2016
2 10

how can i generate graph families(all possible set )with given number of vertices?(just vertices ,not given edge set)

for instance : how can i write a procedure about with 4-vertices all graphs ,5-vertices,..and so on

### Aymptotic expansion for hypergeometric function...

July 21 2016
1 4

I want to approximate the following hypergeometric function for large values of Y. The variables c and R are complex parameters.

hypergeom([-I*(c+sqrt(c^2-1)), I*(-c+sqrt(c^2-1))], [-I*(2*c+I), -I*(c+I+I*c/R)], exp(Y)*c/R)

I allready tried asympt(f,Y), but maple failed.

### How to avoid auto simplification in LateX code gen...

July 21 2016
0 2

How can I get the equation G1 automatically shown in Latex as stated? Example:

G1 := V = Pi*(d/2)^2*h;

latex(G1);

# yields V=1/4\,\pi\,{d}^{2}h

rendered:

How can I make G1 inert so that Latex generator accepts it as input?

### Draw large network topology using maple ...

July 21 2016
1 7

I am a beginner with Maplesoft.

I have a data file with several devices IDs and links between these devices (more than 5000 links). For representing a network in Maple, I am aware that the GraphTheory package should be used. The vertices and edges are to be defined and the graph to be displayed.

The examples that I have looked at do not have such a large number of links. With more than 5000 links in the data file, I am not sure how to proceed further.

Any help or pointers would be highly appreciated.

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