## Problem with Expansion...

Can anyone offer an explanation why the following error occurs, and how it can be avoided? Thanks!

## History of optimization process...

Hi,

I ues the optimization tool in Maple2015.

In my experience, Maple optimizatiom tool just shows the optimum values, not a history of the optimizatiom process.

I want to know how I can obtain the history of the optimization process, such as values of the objective, constraints, and tolerance at every iteration.

Is there anyone who knows how to obtain the history data of the optimization process?

## Modeling and analysis of mechanical systems with...

Maple 2015

In this paper we will demonstrate the many differences of implementation in the modeling of mechanical systems using embedded components through Maplesoft. The mechanical systems are used for different tasks and therefore have different structure in its design; as to the nature of the used functional elements placed on them, they vary greatly. This diversity is reflected in approaches and practices in modeling.

The following cases focus on mechanical components of the units manufacturing and processing machines. We can generate graphs for analysis using different dynamic pair ametros; all in real-time considerations in its manufacturing costs from the equations of conservation of energy.
Therefore modeling with Maplesoft ensures the smooth optimum performance in mechanical systems, highlighting the sustainability criteria for other areas of engineering.

XXXIII_Coloquio_SMP_2015.pdf

XXXIII_Coloquio_UNASAM_2015.mw

(in spanish)

L.AraujoC.

## Problem with system of equations...

Hi

Anyone could help me in solving the following system of equations to get constants C1, C2, C3 and C4. MALPE give me this "soution may have been lost".  The MAPLE sheet is also attached.

 > restart:
 > Eq1:=simplify(C3*exp(-(1/4)*(C2*(x^2-2*0)+sqrt(C2*(x^2-2*0)^2+4*M*(x^2-2*0)*w1*(x^2-2*0)))/w1)+C4*exp((1/4)*(-C2*(x^2-2*0)+sqrt(C2*(x^2-2*0)^2+4*M*(x^2-2*0)*w1*(x^2-2*0)))/w1)-U) = 0;
 (1)
 > Eq2:=simplify(exp(-(1/4)*(C2+sqrt(C2^2+4*M*w1))*(x^2-2*0)/w1)*C3*x+exp((1/4)*(-C2+sqrt(C2^2+4*M*w1))*(x^2-2*0)/w1)*C4*x+C2-V-z) = 0;
 (2)
 > Eq3:=simplify((-2*w2*w5*ln(C3*exp(-(1/2)*sqrt(w2*w4*(w2*w4+w3*w6))*C2*(x^2-2*0)/(w2*w4*w5))-C4)*sqrt(w2*w4*(w2*w4+w3*w6))+w2*w5*(-w2*w4+sqrt(w2*w4*(w2*w4+w3*w6)))*ln(exp(-(1/2)*sqrt(w2*w4*(w2*w4+w3*w6))*C2*(x^2-2*0)/(w2*w4*w5)))+C1*w3*w6*sqrt(w2*w4*(w2*w4+w3*w6)))/(sqrt(w2*w4*(w2*w4+w3*w6))*w3*w6)-1)= 0;
 (3)
 > Eq4:= simplify((-C2*x^2*w2*w4-.50*C2*x^2*w3*w6+sqrt(w2*w4*(w2*w4+w3*w6))*C2*x^2+2.*w2*w4*w5*ln(w3^4*w6^2*(C3^2*exp(-1.0*sqrt(w2*w4*(w2*w4+w3*w6))*C2*x^2/(w2*w4*w5))-2*C3*exp(-.5*sqrt(w2^2*w4^2+w2*w3*w4*w6)*C2*x^2/(w2*w4*w5))*C4+C4^2)/(w2*w4*(w2*w4+w3*w6)*C2^2))-5.544000000*w2*w4*w5-w3^2*w6)/(w3^2*w6)) = 0;
 (4)
 > solve({Eq1, Eq2, Eq3,Eq4}, {C1, C2, C3,C4});
 >

## convert inert d_ to D...

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

Michael

## BesselJ evaluation problem

by: Maple 2015

Apparently inconsistent behaviour of the BesselJ() function.

Examples: BesselJ(-3, 0)  ... gives 0 (correct)

but BesselJ(-3.0, 0), BesselJ(-3, 0.0)  and BesselJ(-3, 0.0) all give Float(infinity) (wrong! - should be 0.0)

The problem seems to occur for all negative integer values of the first argument (the order) when the second argument is 0 or 0.0.

## Maple 2015 and Mac OS X El Capitan : slow, irrespo...

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

## electrical circuit calculations with polar coordin...

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

## Simple procedures and plots...

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!

## Defining and plotting this function...

Hello

I have this function:

f(x)=80x-2x2

I want to plot it (and ofcourse define it)

I then need to find A'(x)= 0 which has to give 20, but my maple wont do that.

Help me thanks.

## Defining this function...

Hello

How do I define this function? s(t) = 5*t1/2

This function shows the pace of a particle. I have to decide the time when the pace of the particle is 2 m/s

help

## Looping over entire worksheet...

Is there a way to loop over an entire worksheet I already have? I am too lazy to retype everything into one for loop, and I couldn't just copy and paste everything into one command thing (the space you make when you shift-enter). Is there something I can put before my worksheet that runs it, changes one variable, runs it again, etc.?

Thanks! I hope it is clear what I am asking.

## Cannot find the help-manual menu of maple2015...

I cannot find the help-manual menu at th maple2015

but I can find it at maple18.

how can I use the help-manuals..-List of Packages  from maple2015?

## How to simplify this result...

How to simplify this result in order it returns the correct answer i.e : sqrt(Pi)/2*exp(-2*abs(x))  -infinity<x<infinity.

int(exp(-t^2-x^2*t^-2), t = 0 .. infinity);

print(`output redirected...`); # input placeholder
/
1 |
- |
2 \
/     /                    / 2            \
1   (1/2) |     |                    |t  + csgn(x) x|
- - Pi      |limit|exp(4 csgn(x) x) erf|--------------|
2         \     \                    \      t       /

/  2            \                  \\
|-t  + csgn(x) x|                  ||
- exp(4 csgn(x) x) - erf|---------------| + 1, t = 0, right||
\       t       /                  //

\
(1/2)|
+ Pi     | exp(-2 csgn(x) x)
/

It comes from Peirces's Tables No 510.

I have notice that Maple's integrator is very efficient.It is one  integral from these tables that Maple can't handle directly.

To be contined later.

Best,

Jean-Michel

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