MaplePrimes - Questions and Posts tagged with parameter

Objects in Maple 16

gwpatrick — Tue, 15 May 2012 16:08:19 Z

(1) Does ModuleCopy, when automatically called from Object, really get the a shallow copy of the object

as the first parameter in its parameter list? See below, which is copied directly from ?object,create. The

ModuleCopy has first argument new::Dollar but ModuleApply only passes its two arguments not three. I

couldn't find a reference to this feature in the docs.

Physics: Bead on a rotating hoop

koonduck — Thu, 10 May 2012 05:00:34 Z

Hello,

I am working on a physics problem that involves a bead on roating hoop. You need to use Lagrangians to solve this problem but this is not where i am strugling. My school expects us to use maple because it is the program the provide but none of the teachers know how to usem it (they use mathmatica) so they cant help us. We have the equation: θ"= [ω²*cos(θ)-(g/R)]sin(θ) and the initial cond. θ'(0)=0 and θ(0)=θ

What do these parameters of Clutch mean,phi_nominal,w_small,k_locked?

diff8911 — Tue, 17 Apr 2012 02:45:35 Z

What do these parameters of Clutch mean,phi_nominal,w_small,k_locked?

And, how can I use them?

Anyone can tell me the detail?

Thank you.

Parameters in dsolve as variables for another Equation

Dragonsoul02 — Mon, 16 Apr 2012 10:45:58 Z

Hello everyone.

I have 2 systems of differential equations which depend on variables from each other, of course the differential variable for each is different.

Not to get into the details of the system, since they are rather large, the problem is as follows:

I've managed to get with the parameters option a solution for x(z), in essence x(parameters=[a,b])(z). I've managed in turn to generate a procedure that would give me the avg value of x (xm...

How to pass optional arguments with repeated name

rembremading — Thu, 29 Mar 2012 18:27:37 Z

The following simple code

myproc1:=proc({parlist::list:=[]}) return parlist[1]; end proc: myproc2:=proc(parlist::list) return myproc1('parlist'=parlist); end proc: myproc2([1,2]);

fails with

Error, (in myproc1) invalid subscript selector

The reason is that myproc1 has the optional argument parlist, which has the same name as myproc2. myproc2 seems to make...

Fitting a "complex" function to measured data.

Jarekkk — Fri, 16 Mar 2012 18:42:10 Z

I am trying to compute the diffusion coefficient from the diffusion equation. I can compute the analytical solution and evaluate it for the parameters I know and for the known time t to get this function:

f:=x->
646.0548255+(309.8026777+568.8289152*I)*((.8781989023+.4782956073*I)*ln(1.+(-.8781989023+I*((-1)*.4782956073))*exp(10000000*((-1)*9.013850411)*Dif+(61.46924721*I)*x))+(.8781989023+.4782956073*I)*ln(1.+(-.8781989023+I*((-1)*.4782956073...

Speeding up MapleSim simulations

rwong1231 — Sun, 11 Mar 2012 23:04:23 Z

Hi all,

I'm currently running a parameter space search via Maple scripting. The pseudo-code goes something like this:

fopen text file to write data to;

initialize parameters (variable) x, y, and z;

for x number of iterations

A:-Simulate(model.msim, with [parameters]);

Update parameters with new values;

Write to text file;

end do;

fclose(text file)

Running parameter space searches

rwong1231 — Wed, 25 Jan 2012 04:18:36 Z

Hi everyone,

In MapleSim, I know that after running a model simulation, one can save the data via 'export data in excel or csv' format...

But is it possible to automate this process via a script? For example, if I wanted to see what the model data looks like by varying one parametere between 10 to 50?

Example:

for i = 1:50

variable_in_model = i;

run MapleSim model;

save MapleSim model data;

Circle equation

andreas10 — Wed, 14 Dec 2011 19:52:15 Z

Hey there, this is my first post here, so hello to everyone.

I have (so far) one question. I have a circle equation like

x²+y²-6y+6=0

I know, that on a paper, I can convert it to the "normal" circle equation, from which I can read the middle point and radius of the circle. And now my question is, how to convert in in maple? I am using the 11th version.

I have tried solving this equation and (x-a)

Plotting standing waves

seanstnn — Wed, 14 Dec 2011 19:35:59 Z

How can I plot standing waves with extra parameters. That is how can I plot something like 2A*sin(kx)*cos(wt) and vary the parameters to see what would happen if different types of waves traveling in different directions collided.

Encapsulated transformation of expression to compiled function

icegood — Tue, 22 Nov 2011 11:19:49 Z

How to do subj? Straightforward way doesn't compile:

restart;

myint:= proc(u::float)::float;
return int(exp(x^6), x=0.0..u);
end proc:

createcomp:=proc (expr::evaln, exprfunc::evaln);
exprfunc:=(v::float)->unapply(evaln(expr),a)(v);
return Compiler:-Compile(exprfunc,optimize);
end proc:
global_expr:=myint(a)+a^a;
s:=createcomp(global_expr, global_exprfunc);

"Error, (in Print) cannot translate value of lexically...

Let's twist again

Markiyan Hirnyk — Fri, 28 Oct 2011 15:54:21 Z

How to calculate the integral
restart; int(cos(a*x)*cos(x)^(a-2), x = 0 .. (1/2)*Pi) assuming a>1
with Maple? Mathematica 8.01 produces a very doubtful answer
In[1]:=Assuming[a > 1, Integrate[Cos[a*x]*Cos[x]^(a - 2), {x, 0, Pi}]]
Out[1]=((-1)^a* a* HypergeometricPFQ[{1, 1 - a, 1 + a}, {3/2, a}, 1/2]* Sin[a *[Pi]])/(-1 + a)

pointplot arrays

okoolo — Tue, 18 Oct 2011 18:49:28 Z

Hi, I have 2 sets of data:

P := array([1.23, 1.15, 1.10, 1.20, 1.35, 1.25, 1.28, .99, 1.22, 1.25, 1.30, 1.05]);

Q := array([892, 1012, 1060, 987, 680, 739, 809, 1275, 946, 874, 720, 1096]);

p=P(t), q=Q(t) i.e. both p & q are a function of parameter t  t=1..12

2 functions:

x=ln(p)

y=ln(q)

I'm trying to display x against y , ie x=ln(p) on the horizontal axis, y=ln(q) on the vertical

Infinite number of parameters - how?

danishmath — Wed, 21 Sep 2011 08:56:18 Z

How do I allow an infinite amount of parameters (...rest parameters don't seem to exist in Maple) such as the ones in the piecewise procedure (except for the optional parameter)?

dsolve, events: how to build an efficient loop

PatrickT — Wed, 14 Sep 2011 10:19:19 Z

My question is related to this discussion on "querying events"

http://www.mapleprimes.com/questions/125273-Dsolve-Events-How-To-Control-For-A-Sign-Change#comment125426

I thought I might start a new thread.

The following loop is an illustration of the sort of thing I'd like to do with dsolve and events: I loop over a parameter of the "event" and extract information on the solution at different values of the parameter. Here is the code (successfully tested on Maple 15 / Standard / Windows)...