MaplePrimes - Questions and Posts tagged with math

bracket matching rectangular yellow box not appearing?

Muhammad Ali — Wed, 08 May 2013 20:21:16 Z

I have bracket matching turned on but donot get the rectangular yellow box around matching brackets as shown in the attached picture. Can anyone help me how to turn this feature on for both input and output?

How to solve an equation in three variables, in terms of one variable only fixing other two variables in maple.

litun — Fri, 03 May 2013 05:45:48 Z

I have the following equation, I want to solve it for b keeping a and c fixed.

5*b^5+(60-5a)*b^4+(125+50c-80a)*b^3+(594c-445a-775)*b^2+(2324c-1005a-3270)*b+3000c-750a-3000=0.

How to solve it in maple?

Trying to plot an equation in Maple, Plotting Error, empty plot

wrestler04 — Sun, 14 Apr 2013 04:38:33 Z

I am using Maple 15 and every time I try to plot this equation it doesnt seem to want to plot. This is the code I keep trying to input:

plot(3*e^(-x)*x-e^(-x)-1.5*e^(-x)*(x^2)+e^(-x)*(x^2)*log(x),x=0..9,y=-1..0.6);

Every time I get "Plotting Error, empty plot"

The equation came from the original differential equation .5(d^2y/dx^2)+(dy/dx)+.5y(x)=ln(x)e^(-x)

Also When i try to plot this equation:

-.5*e^(-10*x)*sin(10*x)-.5*e^(-10*x)*cos(10*x)+(3/2)=300

How to integrate exponential integrals in Maple? (Mathematica does the job)

matja — Tue, 26 Feb 2013 09:05:41 Z

Hello,

I've been trying to force maple to find a solution of this differential equation:

ode := -((D@@2)(y))(r)-2*y(r)/r+y(r) = (2-V(r))*u[0](r)

dsolve(ode, y(r));

gives

y(r) = r exp(-r) _C2 + (exp(r) + 2 exp(-r) Ei(1, -2 r) r) _C1 - 4 

            /  /  / 
            |1 | |  
  exp(-3 r) |- | |  
            |2 | |  
            \  \/   

                               /   2    \             \

How do you create banked curves in MAPLE?

bconn — Sat, 16 Feb 2013 19:56:55 Z

For a math class, we have to create a roller coaster. Part of the coaster consists of two banked curves. I've tried looking it up but Maple isn't very clear on how to create the. So, how do you create banked curves in Maple?

Fouriest transform of Integers

John May — Fri, 01 Feb 2013 15:18:00 Z

Today's SMBC strip by Zach Weinersmith is a silly math joke but it was pretty much begging for implementation.

So, here is a simple brute force Maple program to compute the Fouriest transform of an integer.

fouriest := proc(n::posint, ob::posint:=10)
local b,f,cap,i,rdx,fc;
...

Polar plots for two differential equations

jobomaphoy — Thu, 31 Jan 2013 12:15:22 Z

Hi,

I have two differential equations describing a solar sail in 2D.

One is my radial direction and one is the tangential direction.

I have plotted r(t) and theta(t) but I want r(theta) so I have assigned my two differential equations and initial conditions, have my two plots for r and theta in terms of t and then I have used the following command to plot in polar coordinates:

Steady state concentration

call_me_jeremy — Wed, 30 Jan 2013 10:43:32 Z

Hi,

I'm new in Maple and i've a project to do. I've to find at what time is 90% of the steady-state concentration of C achieved. And the eq is

z'=k(1/2-z)(1/3-z), where k=0.3.

So i had worked in Mathematica before and i know that it would look something like that in there:

eqn1 = 0 == k (1/2 - z[t]) (1/3 - z[t])

DSolve[Evaluate[{eqn1}], z[t]].

But i have no idea how to find this 90%. I hope that someone will...

Shifted Data IVP

TobiasKr — Sun, 23 Dec 2012 19:19:38 Z

Hello everybody,

I just realised Maple is allowed for my upcoming exam after New Year.

My plan is to have templates of the most common math problems, I might encounter for quick solutions.

Anyway, I have run into a problem with Laplace shifted data, particularly initial value problems. I have been searching for HOURS, and feel like I have look up everything on google, maplesoft and other sites without succes.

I hope some of you are able to help me. The exercise is:

how to stop maple from evaluating my solution and pass as string

vineetloya — Wed, 12 Dec 2012 18:52:17 Z

Hello,

I am working on a Maple project and it require me to pass a differential equation in a specific order like

x'=y & y'=x^2.(It is differentaiting w.r.t 't'(say))

However when I convert the equation into string it converts something as

diff(x(t),t)=y(t) & diff(y(t),t)=x(t)^2

Is there any way to stop maple from evaluating into maple/math format?

Is there any way to pass an equation without changing it's existing form?...

How to do dynamic programming?

brian bovril — Sat, 17 Nov 2012 10:52:02 Z

I'm not sure if u have seen this website http://mathproblems.info/working.php#s99 but i wonder if there is a better way to solve this problem using maple:

#99

It is your task to deliever as much grain as possible from city A to city B. The cities are 1,000 miles apart. You initially have 10,000 pounds of grain. Your camel may carry up to 1,000 pounds and eats 1 pound of grain per mile traveled. You...

Formulate equation with different classes (categories) & subscripts

casperyc — Tue, 13 Nov 2012 15:47:31 Z

test.mw

Hi all,

Here is the problem, I will try my best to describe it:

Firstly of all,

log(p[j,c]/(1-p[j,c]))=mu+tau[j]+eta[c];

In this system, the 'j' is a time varying parameter, and the...

Eigenvalues Doesn't Return All The E-Values

asmith05 — Tue, 16 Oct 2012 15:27:53 Z

Hi,

I was trying to find the generalized eigenvalues for the (3x3) matrix pair (P,G) defined below. (I have left everything in symbols with beta and kappa both of which are strictly positive real numbers). For some reason the command Eigenvalues(P,G) is only returning 2 generalized eigenvalues. Any ideas why it doesn't return 3?

Thanks,

Lee

variable up to another variable

rsalomao — Thu, 04 Oct 2012 18:43:45 Z

Anyone knows how to use an expression like , where t is a polynomial variable and n is an intager variable, in such a way that ? Actually, I would like to use it inside some package like polynomial tools, in order to normalize such expressions.

Car Talk Puzzler - September 22, 2012

Robert Lopez — Tue, 02 Oct 2012 18:26:40 Z

Revision Note:
I have updated the graph in the attached Maple document based on Doug Meade's comment below.
CarTalkPuzzler_9-22-.mw

Car Talk, a humorous phone-in program in which Tom and Ray Magliozzi (Click and Clack, the Tappet Brothers) diagnose and offer solutions for mysterious auto-related maladies, is carried by National Public Radio...