Unanswered Questions

This page lists MaplePrimes questions that have not yet received an answer

When I open my file I got an error message says "there were problems during loading process"

and some of my text are missing.

Maple Worksheet - Error

Download quant_hw_5.mwquant_hw_5.mw

Download quant_hw_5.mw

Can anyone help me,please

Hi,

I have a non linear ode with sinosoial term, (sin(x)).

How can we Analyse the system and plot the bifurcation diagram:

x'=r*x-sin(x);

Thank you very much for your help.

 

Hello,

One again, I have a problem to solve some bifurcation problem using maple.

Discuss the existance of Equilibria and determine any possible bifurcation.

x'=r*x-ln(x+1);

where $r$ is a parameter.

many thinks for your help and suggestion.

 

 

 

Hello everybody. I'm newbie and my english are not very good. Please help me debug an error in my files DSOLVE_NOT_SUCCESSFULL.zip: "Error, (in ans) cannot determine if this expression is true or false"
Thanks.

Hi

I have three system of ODE and i would like to solve it using Homotopy perturbation method. Could you please provide to me the code in Maple or the Maple pachage that used to solve it by Homotopy perturbation method ?

I hope to hear you soon

Sara

 

Can someone please let me know if there's a command which shows the name of the current (and running) worksheet? I would like it to be exported to an output file which is the easy part but I don't know how to automatically read it. Thank you very much.

Hi all.  I have researched into this problem.  But I could not find a solution to this.

Here is an example.

I have a set of independent variables, say there are 5 of them.  They are 1. Gender 2. Age group 3. Full or part time 4. First language.

I have a set of dependent variables.  Let us consider for an example 6 of them.  They are (i) Develops breast cancer (ii) Develops skin cancer (iii) Develops lung cancer (iv) develops prostate cancer (v) Lives till 50 (vi) Lives till 60 ...

How do I perform the following prediction:

(A) If a person is male and above 50, what are the chances that he is likely to develop prostate cancer?

(B) If a person is female and works part time, what are the chances that she is likely to develop breast cancer and lives till 60?

I need to develop a code and formula to do this?  Can someone please advise?

Many thanks.

Kind regards,

Kris

I have a proc as follows:

F:=proc(f,n)
L:=[f];
for j from 1 to n do;
J:=int(1/subs(t=x[j],L[j]),x[j]=2..x[j+1]);
L:=[op(L),J];
end do;
end proc;

I chose to use index variables. However when I try to apply a member of the output list as a function of the outermost limit, I do not get any output when I try to evaluate the function. I suspect maple is having trouble with the variables withing the integral. How can I make this work?

I'd like to have a function that I can evaluate:

g:=F(log(t),3)[3];
f:=unapply(g,x[3]);

f(2.1);

Thanks!

hi,

I am trying to plot the polygon but it isnt working. Please help

 

i put

triangle := polygonpolt3d ([13,11,12], [16,10,18], [14,10,7]) :

display3d (triangle)

I'm trying to solve a differential equation in Maple given by:

 when y(3) = -7.

 

I should get the result

but for some reason I get 

 

I solved it by writing:

 

I have Maple 18 if it makes a difference.

Dear all

I want your help in a problem.I want to substitute in a summarization ,the variables for Vi and ξi.Because the number of variables are more than 200 I want to know if there is a way to take them from the excel sheet and put the to my program.attached are the maple worksheet and the variables table

P.s. i have done it for 44 variables

My old disc with the maple version 17 worked perfect, but later the disc has colapsed. So I changed the disc and installed the programm. The installation and the activation were successfull. But the programm doesn't start more. Only the command-version in dow-window. What is wrong?

https://drive.google.com/file/d/0B2D69u2pweEvaUNnVWdXbm9WT3c/edit?usp=sharing

for base 10

1 op1 5 = 

        01

op1   12

_________

first digit of first number 1     = 1

first digit of second number 1 = 2

 then find 12 in logic table, it is 1, separation is 1 means move the value 1

to left 1 digit become 10

convert 10 back from base 3 to base 10, it is 3

how to construct this unknown name operator table with the custom logic table Min, Except, Diff

based on the operation described

 

no matter the logic table is correct or not, hope to mechanize these calculation steps for developing 3 operation table for base 10 quickly.

is it possible to develop a new kind of algebra with 3 new operators with the use of 3 operation table?

 

 

ex4_lista_CSTR.mw

Variáveis

 

``

restart;

F[A][0] := 43, 4;

43, 4

 

802, 8

 

0

 

71, 87

(1.1)

C[P][A] := 35;

35

 

18

 

46

 

19, 5

(1.2)

deltaC[P] := -C[P][A]-C[P][B]+C[P][C];

-7

(1.3)

V := 40, 1

40, 1

(1.4)

v[A][0] := 46, 62;

46, 62

 

46, 62

 

233, 1

(1.5)

v[0] := v[A][0]+v[M][0]+v[B][0];

325, 125

(1.6)

H[A][ref] := -66600;

-66600

 

-123000

 

-226000

(1.7)

deltaH[R][ref] := -H[A][ref]-H[B][ref]+H[C][ref];

-36400

(1.8)

deltaH[R] := deltaH[R][ref]+deltaC[P]*(T-T[ref]);

-36400-7*T+7*T[ref]

(1.9)

``

k := 16, 96*10^12*exp(-32400/(R_*T));

16, 96000000000000*exp(-32400/(R_*T))

(1.10)

R_ := 1, 987;

1, 987

(1.11)

C[A][0] := F[A][0]/v[0];

(43, 4)/(325, 125)

(1.12)

T[0] := 75;

75

(1.13)

T[ref] := 68;

68

(1.14)

 

Balanço Molar

 

r[A] := -k*C[A][0]*(1-X[MA](T));

-(16, 96000000000000*exp(-32400/((1, 987)*T)))*(43, 4)*(1-X[MA](T))/(325, 125)

(2.1)

``

EQ1 := X[MA](T) = V*k/(V*k+v[0]);

X[MA](T) = (40, 1)*(16, 96000000000000*exp(-32400/((1, 987)*T)))/((40, 1)*(16, 96000000000000*exp(-32400/((1, 987)*T)))+(325, 125))

(2.2)

``

Balanço de Energia

 

r[A] := -k*C[A][0]*(1-X[EA](T));

-(16, 96000000000000*exp(-32400/((1, 987)*T)))*(43, 4)*(1-X[EA](T))/(325, 125)

(3.1)

``

EQ2 := X[EA](T) = 1-(C[P][A]*F[A][0]+C[P][B]*F[B][0]+C[P][C]*F[C][0])*(T-T[0])/(deltaH[R]*V*k*C[A][0]);

X[EA](T) = 1-(15941, 284)*(T-75)*(325, 125)/((-35924-7*T)*(40, 1)*(16, 96000000000000*exp(-32400/((1, 987)*T)))*(43, 4))

(3.2)

``

``



Download ex4_lista_CSTR.mw

 

 

 

 

E     Average
number
Fermi-
Dirac
 0      1.8
 1      1.6
 2      1.2
 3      0.8
 4      0.4
 5      0.2
 6      0
 7      0
 8      0
 9      0

 

E=0   f(E)=1.8  = 1/A+1    A=-0.444    kt is unknown. Hence I try many numbers.

This is my code

plot(1/(-0.444*exp(x/3)+1),x=0..9);

 

I have a problem.  A is negative. The denominator would be zero.

This is the theory.

http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/disfdx.html#c2

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