I want to solve a diff eqn, but it is giving absurd answer.

> ode := diff(f(x), x, x) = (Phi(x)-lambda)*f(x);
                    d  / d      \                         
                   --- |--- f(x)| = (Phi(x) - lambda) f(x)
                    dx \ dx     /                         
> dsolve(ode);
               / /                           / d  / d       \\\          \
   f(x) = DESol|{ (-Phi(x) + lambda) _Y(x) + |--- |--- _Y(x)|| }, {_Y(x)}|

restart;
b := 7; de1 := diff(f(eta), eta, eta, eta)-M^2*(diff(f(eta), eta))-(diff(f(eta), eta))^2+m1*f(eta)*(diff(f(eta), eta, eta)) = 0, diff(theta(eta), eta, eta)+m1*Pr*f(eta)*(diff(theta(eta), eta)) = 0, f(0) = S, (D(f))(0) = -1, (D(theta))(0) = -1, (D(f))(b) = 0, theta(b) = 0; d1 := subs(m1 = 1, S = 1.75, Pr = 0.7, M = 2, [de1]); d2 := subs(m1 = 1, S = 1.80, Pr = 0.7, M = 2, [de1]); d3 := subs(m1 = 1, S = 1.85, Pr = 0.7, M = 2, [de1]); d4 := subs(m1 = 1, S = 1.90, Pr = 0.7, M = 2, [de1...

hi

I have two sets of data namely x[i] and y[i], at first i want to pass a spline from all points (points are in 2d x-y diagram) and then extract some point from that. how can i write the suitable code  in maple? 

thanks

Hi There,

Wondering if anyone was able to assist...

I'm trying to differentiate the following equation with respect to Qin:

f(T,Qin,Qp1,Qp2)=T(Qin-Qp1)*(Qp2-Qin)/(Qp2-Qp1)

I have tried using the diff command but with no luck, Maple is returning D(T)(Qin-Qp1)*(Qp2-Qin)/(Qp2-Qp1)-T(Qin-Qp1)/(Qp2-Qp1) which is not complete. 

Any assistance would be much appreciated.

http://www.file-extensions.org/imgs/app-picture/3023/maple.gif

I want to make an application like the picture in Maple 16. Cuold you help me how to make it ?

Do you have any applications about physics nn maple 16?

ok I want to extract data from http://online.wsj.com/mdc/public/page/2_3024-AsianStocks_HONG_KONG.html
So in maple I type:

HTTP[Get]("http://online.wsj.com/mdc/public/page/2 _3024-AsianStocks_HONG_KONG.html", timeout = 100)

but this only give me a bunch of crap and no data and is extremly slow.

What can I do to get the data in a much more efficient way?

hi

i have two row data in excell and i import in maple as the following

Cl_alpha:=<<0.0887574|0.35157>,<0.502959|0.401794>,<0.91716|0.452018>,<1.30178|0.502242>,<1.71598|0.552466>,<2.13018|0.602691>,<2.54438|0.652915>,<2.95858|0.703139>,<3.37278|0.753363>,<3.78698|0.803587>,<4.20118|0.853812>,<4.5858|0.900448>,<5|0.950673>,<5.4142|1.0009>,<5.8284|1.05112>,<6.21302|1.09776>,<6.62722|1.14439>,<7.01183|1.19462>,<7.42604|1.24126>,<7.84024|1.28789>,<8.25444|1.33453>,<8.63905|1.37758>,<9.05325|1.41345>,<9.46746|1.44574>,<9.88166|1.47444>,<10.2959|1.49596>,<10.7101|1.50673>,<11.0947|1.50314>,<11.5089|1.47803>,<11.8935|1.43498>,<12.2781|1.42422>,<12.6923|1.42063>,<13.0769|1.41704>,<13.4615|1.40628>,<13.8757|1.39552>,<14.2604|1.38117>,<14.645|1.38117>,<15.0592|1.3704>,<15.4438|1.35605>,<15.858|1.33812>,<16.2722|1.32735>,<16.6864|1.29148>,<17.071|1.29507>,<17.4556|1.27354>,<17.8698|1.19462>,<18.2544|1.23767>,<18.6391|1.18027>,<19.0533|1.24843>,<19.4675|1.26996>,<19.8521|1.21973>,<20.2367|1.23049>,<20.6509|1.24843>>;

where first row is x and second row is y. i want to interpolate the y values for new x values at the following

xnew:=<<0.119048>,<0.505952>,<0.922619>,<1.30952>,<1.72619>,<2.14286>,<2.52976>,<2.94643>,<3.3631>,<3.77976>,<4.16667>,<4.58333>,<4.97024>,<5.3869>,<5.77381>,<6.19048>,<6.54762>,<6.99405>,<7.38095>,<7.79762>,<8.18452>,<8.60119>,<8.9881>,<9.40476>,<9.82143>,<10.2381>,<10.625>,<11.0417>,<11.4286>,<11.8155>,<12.2024>,<12.5893>,<13.006>,<13.3631>,<13.7798>,<14.1667>,<14.5536>,<14.9405>,<15.3571>,<15.744>,<16.1607>,<16.5774>,<16.9643>,<17.3512>,<17.7381>,<18.125>,<18.5417>,<18.9286>,<19.7024>,<19.3155>,<20.119>,<20.506>>;

please help me

thanks for your attention in advance

I thought the assume command would force Maple to not return solutions that violated the assumption.  But it does not.  How do I make Maple only return those values according to an assumption?

Here is what I did:

Hi all!

I want to restructure some expressinon with non-commutative matrix multiplications &*.

It's needed to transform

expr = `&*`(A, z) + `&*`(B, K, z)

to

expr = `&*`(A + `&*`(B, K), z)

How can i do that? Simplify, collect and factor commands don't work. 

Thank you.

When I install Maple 16, It show: Do you want to install watcom-1.3 ? What is the watcom-1.3 file in Maple16

Hi,

I wrote a procedure and saved it into a .mla library, then accidentally lost the file containing the initial code. Can I get it back from the library ? I didn't find the answer in the help on LibraryTools.

Thank you.

@acer I would like to return to this question again. Unfortunately, the code

> interface(prettyprint = 1):

>proc () print(eval(thisproc)) end proc;

does not reproduce itself. Its output is

proc() print(eval(thisproc)) end proc;
 This does not include the interface(prettyprint = 1): command.

Because of this I still consider my question as open.

Hello,

I am working with wedge products, and I came up with this question: how can I efficiently sort a list of indices, and obtain the sign of the associated permutation?

So for [4,3] I would like to obtain [3,4]-

for [1,4,2] I would want to obtain [1,2,4] -

for [2,1,4,3] I would want to obtain [1,2,3,4]+

I know I can do sort([4,3]) but what about the sign of that permutation?

Thanks!

I have just started using MapleSim 5 and running the examples I got the following notification and don't know how to resolve it (to what options are being referred to and what is infolevel?):

Compiling...

(in dsolve/numeric/RunSimulation) unable to compile, please check your options by running with infolevel[ToExternal]:=1;

Simulation failed.

To highlight the problem I am haveing let us observe the following example. If we solve the following numerically,

d²/dx² (s(x)) +s(x) -1=0,

ic: s(0)=1/2,s'(0)=0

How would I go about createing a plot of (s(x),x) for  x a member of [0,2*Pi) (useing polar coordinates clearly)?

The probelm I am haveing is plotting for x a member of [0,2*Pi). I know how to do this for x a member of [0,2*Pi] and (0,2*PI), but not  [0,2*Pi).