MaplePrimes - Newest Questions

Maple syntax for eigenvalues result

alanaj5 — Mon, 20 May 2013 09:26:33 Z

Hi,

I wonder if you could help me. I'm trying to calculate the eigenvalues of a complicated 3x3 matrix in Maple, but I'm not very familiar with Maple syntax. The answer maple has provided me with is in the form,

(&*(sin(pi*q/P),P/T,3x3 matrix))

How do I interpret this result? The eigenvalues are scalars.

Thanks for your help,

Sian

Using previous inputs in new maplet window

mathallica — Sun, 19 May 2013 18:34:21 Z

How can i use previous inputs in new maplet window.For example i have two maplet windows; maplet1 and maplet2 I use some inputs as a functions in maplet1 and i open new window by using botton from maple1.I also want to use same inputs for calculating function in maplet2

How to take all possible unions

Athar Kharal — Sun, 19 May 2013 17:21:18 Z

I have a set of sets named T. How I can take all possible unions of the members of T and if the result is not in T already, include it in T. I want to do this using a seq command, but could not do. Can anyone help? This is so to say, T is to be made closed under union.

logarithmic derivative?

abenigma — Sun, 19 May 2013 11:49:53 Z

how can i preform this calculation in maple?

(&PartialD;)/(&PartialD; log(R[e[0]]))(log(N[u]))

it's a derivative of a logarithmic expression with respect to another logarithmic expression, the one on the bottom is a "standalone" vairable and the one on the top is a function of the previous one and some others.

thaks in advance to anybody who might help.

how can I compare elements of 2-dim tables?

gcasabianca — Sun, 19 May 2013 00:05:56 Z

Hello!

I am having trouble comparing elements from to list, each having ordered pair as elements.

What I would like to do is this:

if the first component of any ordered pair of the first list is equal to any from the second, then I would like the sum of their respective second components.

I am new in Maple, but I have already managed to create the lists I need...

What i will do if after running a program, it shows:The length of ouput exceeds 1000000?

bello nakone — Sat, 18 May 2013 16:21:00 Z

Get Matrix(n,n) from user - Hanging

khayyam — Sat, 18 May 2013 11:47:43 Z

I am using Maple 15 and when i use blew code , my system freeze!

n:=readstat("Input n:");
A:=matrix(n,n,0);
for i from 1 to n do
for j from 1 to n do
A[i,j]:=readstat("value = ");
od;
od;

where i have mistake?! is there any way to get an arbitrary Matrix with double for Loop? please help me!

Linux/Unix version

casperyc — Fri, 17 May 2013 23:40:58 Z

Hi,

I am using Maple 15 on a school server. In most of the times, the following screen occurs:

Can I get rid of that notice? My results got disappear very quickly to the TOP.

Is that something I can change or it has to be done from the admin?

And just a general question, do Maple run more or less faster on Linux/Unix machine than windows?

Test for equality of expressions

Hiker96 — Fri, 17 May 2013 23:38:42 Z

Bridge and Maple

carmon06 — Fri, 17 May 2013 16:13:43 Z

Hello,
I am currently conducting a study on the bridges and I need to solve a partial differential equations. However, despite all my efforts

dsolve,numeric takes more than 12 hours

mehdi_mech — Fri, 17 May 2013 02:04:53 Z

hi, i have solved my equations with dslove numeric,with 3 terms approximations,it takes maybe 5 minutes to solve it,when i increase 3 terms to 4,it takes more than a day to solve,however my queation is about another problem,
i solved my equations with 3 terms approximation (in 5 minutes),when i want to get answers , for the very little times (i,g=0.00001) it answer quickly,but now i am calculating it for t=1 seconds and it takes more than 12 hours to answer and it...

Maple really slow (or unable) to calculate Jacobian and/or Rank

casperyc — Thu, 16 May 2013 23:14:50 Z

Hi all,

For research purposes, I have symbolic matrices of dimentions up to 100 x 50 (and above) with certain number of parameters. Then giving random value to those paramters, I want the numerical rank of the matrices.

Maple 17 does not seem to work well with symbolic ranks, where expentials are involved.

And more to it, both

Student[MultivariateCalculus][Jacobian]

and

VectorCalculus[Jacobian]

does not seem to work. ...

help with plot 3d, axis tickmarks appear blurred and rotation freezes computer

kkongelbeck — Thu, 16 May 2013 20:44:08 Z

I am new to Maple (converting from Mathcad) and I am having trouble with plot3d in Maple 17. Even in the help examples the scale numbers next to tickmarks appear blurred. In addition after a couple of rotations of the 3D plot, my computer freezes and has to be manually reset. I'm using Windows XP with 4 GB of physical memory.

Would appreciate any help.

Thanks in advance.

Error, (in fsolve)

Drakelore — Thu, 16 May 2013 09:25:56 Z

Dear Mapleprimes

I am working on getting the right angles for my gears to fit together. My problem is that my fsolve (at the bottom of the page) does not seem to work. Can you help me by telling me what I am doing wrong.

How can I allocate result of solve command to a variable

esbestan — Thu, 16 May 2013 07:08:03 Z

I want to allocate the result of "solve" command to a variable (array)

u := eval(solve({x-y = -1, 2*x-y = 3}, {x, y}));

...