Hi,

i use fsolve to find appraxmaite solution. there are some parameter in my equastion wher i do loop in this pramater form 0.. 1000,000,00

i have other problem with "fsolve and digits". when Digits =12;  i cannot find  approx solution using "fsolve"

when i decrease or increase  the digit "Digits:=11 , Digits:=13",  i find the  approx solution using "fsolve".

i donot know what is wrong!!!

Hi all,

I have Maple 11  ( Student Version - I am a UC Berkely Distance Learning Student ). I need the Dynamic Systems Package, can I down load it and install it in my Maple 11 install ?? If so how ??

Thanks,

Rajat Mitra

There was an interesting question from Christopher2222:

Maple keeps changing the variable xi to the greek letter

Now I need a solution for a specific application, Here is the code:

with(Statistics):

L:=[Normal, Beta, Gamma]:

for i to 3 do
f[i]:=RandomVariable(L[i](4,2):
end do:

This will work for L[1], but not for L[2] and L[3]...

hello all, I'm trying to solve ODE's but my computer takes a very long time evaluationg. and still not giving an answer for more than 4 hours.

so please is there anything error in my solution

deqs := {NULL
         , diff(u2(y), y, y)-((h^2/K)+m*h^2*M^2)*u2(y)+m*b*rho*h^2*GR*(c3*y+c4) = 0
         , diff(u1(y), y, y)-((1/(K*(1+k1)))+(M^2/(1+k1)))*u1(y)+k1*(diff(N(y), y))/(1+k1)+GR*(c1*y+c2)/(1+k1) = 0

I am not able to format the number along the axis of a 2D plot to use period as the decimal separator - and not to have different number of positions after the decimal on the x- vs. the y-axis either.  I have set the Windows language/region to the US.  Anyone who might help?  Regards,

Let's say I define L1..L5 and M1..M5 respectively

for i to 5 do:
L[i]:=(-i^2+6*i);
end do;

for i to 5 do:
M[i]:=(-i^3+18*i);
end do;

Now I want to find out, whether the maxima of the two sequences L1..L5 and M1..M5 have the same subscript.
So I need a kind of proc that outputs 'true', if subscript(max(L1..L5))=subscript(max(M1..M5)), 'false' for subscript(max(L1..L5))<>subscript(max(M1..M5)) and 'FAIL' otherwise.

Does anyone...

Greetings:

Anyone know how I can print the code of the Tutorials of the Maplets?

 I need take it as a guide to developing themselves because I don't dominate so much the Maplets management and I need...

What's wrong?
Hello everyone.
I probe a Maplet's example about a Procedure Call but, when I run it, displays the following error:

I want to parse a large listlist with strings and floats

As an example
a:=[["he","45",123,76,"1.0",4],["know","4",9,34,"3.2",5]]

I want to parse a but it requires all entries to be strings

map2(map,parse,a) 
Error, invalid input: parse expects its 1st argument, st, to be of type string, but received 123

So my workaround was to convert all entries to a string.  How do I do that?  and how can I parse without having to...

question1:

plot(2/(3*x)+x, x = -5 .. 5)

Though this is ok ：plot(2/(3*x)+x, x = -5 .. 5, y = -5 .. 5)

but ... lazy to set range of y axis at the very start.

 question2：

how to plot more graph on different invertals  one time.

for example the intarvals [-5,5],[-1,1],[0,1]

Hi, I'm using Maple 13 off of my university's server. I was wondering how I can prevent "nested input", for lack of better words.

For example, say if define f := x -> something

Then I want another function to handle f's derivative: df := x ->diff(f(x),x)

Now I want to evaluate df at x=1 value so I do df(1)...

but I get an error:

Error, (in df) invalid input: diff received 1, which is not valid for its 2nd argument

I tried the following:

a:=1:

b:=2:

c:=-1:

L:=[a,b,c]:

M:=max(L);

However Maple outputs M:=2, but I want Maple to tell me the corresponding assignment 'b' of the maximum value of L, or at least 'L[2]'.

Is this possible and if so, how?

Thanks for answering.

Hi,

I am trying to figure out a way for Maple to handle group action.

Specifically, I have a set of sets. Each set is has three distinct numbers between 1 and 6.

Under a permutation element from S₆, this set should be mapped to another set.

For example [[1,6]] maps {1,3,4} to {3,4,6} (order is not important).

Anybody have a clever way to do this?

Regards.

I tried the following:

utility:=[CARA,CRRA,DARA]:

DARA1:=alpha+beta*x:

eval(utility[3]||1,[alpha=1,beta=2]);

Unfortnuately Mape ouputs: utility[3]||1

How can I get Maple to recognize the expression behind utility[3]||1?

Thanks for helping.

> restart;
> ode := `assuming`([(diff(r^2*(diff(`&varphi;`(r), r)), r))/r^2 = k[0]^2*`&varphi;`(r)+Q*Dirac(r)/`ε`[0]], [Q::positive, (`ε`[0])::positive, (k[0])::positive, r::real]);
> ics := `&varphi;`(infinity) = 0, `&varphi;`(-infinity) = 0;
> dsolve({ics, ode}, `&varphi;`(r), method = fourier);
>

Download pintu.mpl.txt

I have an ODE...