MaplePrimes Questions

we know that the exponotial function is represented as a taylor series, that means that the exponontial of any value is approximatvly evaluated ,the same thing of sinus function when i calcute sin(Pi/6) it give me the exacte result,
 

sum(0^i/i!,i=0..infinity);

0

(1)

exp(0);

1

(2)

sin(0.2);

.1986693308

(3)

sin(Pi/6);

1/2

(4)

sin(Pi/2);

1

(5)

 


 

Download trying.mws

,can anyone explain to me these results ?

Came across this issue again.  While working within a worksheet, everything seems fine, using commands like imagetools outputing bmp files etc.  I had to, in the the Options->Precision, uncheck limit expression length to 1000000 during my session.  I saved it multiple times, however and unfortunately did not save as seperate versions, so I was left with one file.

The file size ended up being 64Mb.  The problem is trying to load it into Maple, everytime I try to load the worksheet my computer seems to freeze (laptop, 4Gb RAM, windows 7 64 bit, Maple 2017) I check task manager and my javaw.exe file is consuming 3.7Gb of memory!  So that's why it's locking up. 

I've tried multiple times to open the file and utilmately end up pressing and holding the power button to restart my system. 

 

C: y^2=10161/256*t^2+8829189/25600*t+7266953961/1024000 

how to find the (t, y) points on the curve C ?

THANKS.

Attractor.mw
Hello, anybody could help with this error?

restart

interface(imaginaryunit = j);

I

(1)

with(DEtools):

k := .5; 1; tau := .95; 1; mu := 0.1e-1; 1; pi := 116.1; 1; vartheta := 0.8e-2; 1; phi := 0.25e-2; 1; epsilon := 0.2e-2; 1; rho := 0.5e-1; 1; beta := 0.115e-1; 1; chi := 0.598e-2; 1; q := .5; 1; eta := .2; 1; delta := .1; 1; alpha := 0.57e-1; 1; p := .2; 1; Upsilon := 1.2

.5

 

.95

 

0.1e-1

 

116.1

 

0.8e-2

 

0.25e-2

 

0.2e-2

 

0.5e-1

 

0.115e-1

 

0.598e-2

 

.5

 

.2

 

.1

 

0.57e-1

 

.2

 

1.2

(2)

lambda := k*tau*(C(t)*Upsilon+I(t))/(S(t)+V(t)+C(t)+I(t)+R(t)):

DEplot3d({d*C(t)/dt = rho*lambda*S(t)+rho*`ε`*lambda*V(t)+(1-q)*eta*I(t)-(mu+beta+chi)*C(t), d*I(t)/dt = (1-rho)*lambda*S(t)+(1-rho)*`ε`*lambda*V(t)+chi*C(t)-(mu+alpha+eta)*I(t), d*R(t)/dt = beta*C(t)+q*eta*I(t)-(mu+delta)*R(t), d*S(t)/dt = (1-p)*pi+phi*V(t)+delta*R(t)-(mu+lambda+`ϑ`)*S(t), d*V(t)/dt = p*pi+`ϑ`*S(t)-(lambda*`ε`+mu+phi)*V(t)}, {C(t), I(t), R(t), S(t), V(t)}, t = 0 .. 300, stepsize = .1, [[S(0) = 8200, V(0) = 2800, C(0) = 200, I(0) = 210, R(0) = 200]], linecolour = t, axes = BOXED, scene = [S, V, C, I, R])

Error, (in DEtools/DEplot/CheckInitial) the 'number' option must be specified before initial conditions

 

``


 

Download Attractor.mw

 

How to convert maple file into the pdf file?For example the attacahed file is maple file.I want to convert this to a pdf file.

conservation_of_wave_eq.mw

If i was a good student i wouldnt be using the is function for these at all, but im quite tired now so i thought that it would be fine this time. But i honest cannot see what additional declarations need to be made here, and why a false is returned for the first query, then FAIL for the negation of the first in the second query, the only thing i can think of is declaring that indeed n and m are elements of N, but if maple was allowing for Gaussian n,m surely both queries would return fail, and so obvious it is indeed acknowledging the arguments are on R, anyway hopefully someone gets the chance to make me feel silly here

 


 

assume(n < m, n > 1)

is((3*n-1)/(n^3+2*n+1)-(3*m-1)/(m^3+2*m+1) < 0)

false

(1)

is((3*n-1)/(n^3+2*n+1)-(3*m-1)/(m^3+2*m+1) >= 0)

FAIL

(2)

``


 

Download MISSING_ASSUMPTION.mw

I'm stuck with applying boundary conditions for a cantilever beam please help with format

What is the best method of transferring figures of maple 18 to latex ?

Hi all,

I don't know why this file doesn't work anymore! It was ok last week. I even reinstall the Maple on my laptop, but it went wrong again...

 

Please help me.

 

Plot_Diff_Temperature.mw

Can Maple solve the chief or nurse shift problems? 

I have a positive function and I'm taking an integral from it. I don't get why Maple computes the integral over a bigger region but not over a subset of it! Here is the integral. Does anyone know what is going wrong?

int(15.91549431*abs(6.100147120*10^6/k[6]-2.027358424*10^6*(1.241833982*k[6]/T[1]+2.)/k[6]+2.002942410*10^6/T[1])*exp(-50.00000000*(1.241833982*k[6]/T[1]-1.5)^2)/(k[6]^2*T[1]^2), T[1] = -.5 .. 0, k[6] = -.5 .. 0, numeric)
int(15.91549431*abs(6.100147120*10^6/k[6]-2.027358424*10^6*(1.241833982*k[6]/T[1]+2.)/k[6]+2.002942410*10^6/T[1])*exp(-50.00000000*(1.241833982*k[6]/T[1]-1.5)^2)/(k[6]^2*T[1]^2), T[1] = -.9 .. 0, k[6] = -.9 .. 0, numeric)

Hi all

I have a special 2*2 block martix like follwing:

 

 

how can i define this by maple?

thanks in advance.

I'm optimizing some code and I have noticed that running a procedure within the Threads:-Task module seems to slow the procedure down. I want to use Threads:-Task to run many procedures in parallel and so finish a task faster.
I'm attaching an example of a simple "add" procedure run outside the Task module and within the Task module. As far as I know, the procedure is thread-safe, and this is shown by the similar time it takes to run 1 or 10 simultaneously.
What is going wrong?

``

restart

addproc := proc () local i, A; A := 0; A := add(i, i = 1 .. 1000); return A end proc

ts := time[real](); for t to 1000 do addproc() end do; TA := time[real]()-ts

ts := time[real](); for t to 1000 do Threads:-Task:-Start(null, Task = addproc) end do; TS := time[real]()-ts

ts := time[real](); for t to 1000 do Threads:-Task:-Start(null, Tasks = [addproc, addproc, addproc, addproc, addproc, addproc, addproc, addproc, addproc, addproc]) end do; TM := time[real]()-ts

TA; TS; TM

0.33e-1

 

2.049

 

2.006

(1)

TM/TA

60.78787879

(2)

``


 

Download TaskExample.mw

"There were problems during the loading process. Your worksheet may be incomplete."

 

Pls fix this problem for me. I tried various things. The text in the worksheet is in Danish and contains danish letters (æøå) which may have caused the problem.

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/1._Opgaver.mw .
 

Download 1._Opgaver.mw

Download 1._Opgaver.mw

 

 

In a Maple worksheet i have created a module containing a few procedures. I wish to make the module accesible upon start-up as a package so that i can use my procedures in any maple document or worksheet with my package. How do i do this?

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