MaplePrimes - Newest Questions and Posts

How do i supress the output?

docoi — Fri, 25 May 2012 09:00:16 Z

Hey there i have written the following code and it gets very slow cause of the output at each step, which is not needed. I only need the arrays at the end of the procedure. Has someone an idea how i can suppress the output for the steps betweend the start and the end of the procedure?

restart:
s_1 := 0.779e-1*t^2-.1345*t+.2031:
s_2 := 1.3502*t-6.8742:
s_3 := .1112*t^2-1.5108*t+11.527:
s_4 := 1.9322*t-15.099:
s_5 := -0.178e-1*t^2+2.648*t-22.312:

How can i follow the work of an procedure?

docoi — Fri, 25 May 2012 08:26:53 Z

Hey there,

if sometimes problems with my procedures, so i´m looking for a command which shows me the what the procedure is doing.

The command i´m looking for makes a green output :P. Sadly i forget the command; maybe someone can help me.

Best regards

who can find the integral

yasir 72 — Fri, 25 May 2012 01:45:20 Z

BesselJ Integration

mwb33 — Thu, 24 May 2012 20:08:26 Z

I am trying to integrate the following expression in Maple. It produces the correct result, but not in the format that I want.

BesselProblem := BesselJ(0, BesselJZeros(0, 1)*r)*BesselJ(2, BesselJZeros(0, 1)*r)*r^3;

int(BesselProblem, r = 0 .. 1);

returns the expression

Help on linearizing a system...

moazzam — Thu, 24 May 2012 15:54:06 Z

Hi everyone,

I've been able to generate equations of motion for my system. I want to linearize the obtained equations. How to do it? I've been trying to find some example on it, however, haven't been lucky as yet. Can anyone please help me with this? Anticipating a quick reply!

Regards,

Moazzam

Warning: Warning, solutions may have been lost

nourch — Thu, 24 May 2012 10:55:48 Z

i have a problem in resolving this 5 equations eqn1 := (product(1-tau(i), i = 1 .. 4).delta.Delta.tau(0))*(1+(1/16)*(sum((16-j+1)/(g(0))(j), j = 1 .. 16))+(1-product(1-tau(i), i = 1 .. 4).delta.Delta).(1+(1/16)*(sum((16-j+1)/(g(0))(j), j = 1 .. 16)))+(1-product(1-tau(i), i = 1 .. 4).delta.Delta)^2.(1+(1/32)*(sum((32-j+1)/(g(0))(j), j = 1 .. 32)))+(1-product(1-tau(i), i = 1 .. 4).delta.Delta)^3.(1+(1/32)*(sum((32-j+1)/(g(0))(j), j = 1 .. 32)))+(1-product(1-tau(i), i = 1 .. 4...

plotting a function from a procedure

Jbone12115 — Thu, 24 May 2012 01:06:39 Z

I wrote the procedure below and i want to plot on one graph for the range lambda = 0 to 60 (x-axis), beta = 0, beta = 5, beta =10, beta = 15, beta = 20 etc.

in other words i want to plot Cp vs lambda at different beta values

Can any one assist me in doing this.

_______________________________________________________________________

Cplot := proc (beta, lambda)

local lambda0, Cp;

lambda0 := 0.22e-1*beta^2+(7/1000000000000000)*beta+5.6;

Maple 16.01 now available

eithne — Wed, 23 May 2012 17:33:52 Z

Just wanted to let everyone know that there is a Maple 16 update available. Maple 16.01 includes improvements to the mathematics, interface, and plotting capabilities of Maple, including:

Enhancements to the Physics package in the area of general relativity
Translations of tutors and assistants into French and Brazilian Portuguese
A correction to the problem in plotting multiple plots at once in non-Cartesian coordinates, as

Dsolve---finding a time value for a specific variable

archstevej — Wed, 23 May 2012 16:53:08 Z

Okay, so I think this is simple, but I cannot find the command.

I get a numeric solution for a system of ODEs, with variables a function of t. Now, I know I can use the sol(t) command to give me the values of my variables at specific values of t. But, how do I get the values of t for specific variable values. There has to be a more efficient way than just plugging in values for t until I come to the answer.

Thanks!

Access to CPU usage

Markkx — Wed, 23 May 2012 09:03:23 Z

Hi,

I'm currently having some issues while trying to find a way of getting the CPU usage inside Maple.

Is there any existing Maple function that will return the percetage of the CPU usage ?

Simple polynomial command?

Zukias — Wed, 23 May 2012 00:47:36 Z

Basically I'd just like to know how to get x to temporarily equal a specified value, i.e:

if T[2]=(2x^2)-1

how do I find T[2] is x=2?

Thanks for any replies

How do i solve this list

Ronan — Tue, 22 May 2012 20:05:38 Z

I have Zipped 2 equations together to equate their equivalent Coefficients. I now need to assign solve the list fot each value of N (1...9) How do I get Maple to do this reliably for the list as N 1..9 does not necessarily occour in sequence.

AutoCorrelation Maple vs MatLab

herclau — Tue, 22 May 2012 17:56:52 Z

what is the difference between the autocorrelation function of Maple and MatLab function xcorr?

> N := 1024;
> f1 := 1;
> FS := 200;
> n := Vector([`$`(0 .. N-1)]);
> x := evalf(`~`[sin](2*Pi*f1*n/FS));
> t := Vector([`$`(1 .. N)]/FS);
> plot(t, x, axes = box, gridlines, color = blue, title = "Sinwave of frequency 1000Hz [FS=8000Hz]", labels = ["Time, [s]",

"Amplitude"], labeldirections = ["horizontal", "vertical"]);

MAJOR problem with precision in MAPLE do loops

Thanos — Tue, 22 May 2012 17:24:42 Z

Dear Maple Specialists,

I deal with a major MAPLE problem the last months of my PhD.

PROBLEM:
My programm contains a do loop which calculates for given PsiS (purple color) and for a range of Psi1 and Psi2 (blue color) from PsiS to 0, values for the products Qsu1, Qsu2, Q_tot .
The aim to calculate w(RLZ) which is obtained when the blue color loop is completed and Psi2 takes the final value 0.

`evalf/int`, "external hardware float library could not be found/used"

rembremading — Tue, 22 May 2012 16:38:49 Z

After first tests with my brandnew Maple 16 (64bit) installation on Ubuntu Linux (12.04 Ubuntu Precise) I encountered the following error:

`evalf/int`, "external hardware float library could not be found/used"

when I run e.g.

evalf(Int(BesselJ(3,x),x=1..13,digits = 4,method = _d01ajc));

with OpenMaple

I wonder how to fix it.

I have

export MAPLE=...

and

export LD_LIBRARY_PATH=......