Dear all;

Thank you very much for helping me to understand this problem.

I need your help for this question, it's seem for correct but when I run the code there is no dispaly of the solution with this command  dsolve({ode,ics}) ;

ode:=x*diff(y(x),x)+y(x)=x*exp(-x^2);

ics:=y(0)=1;

dsolve(ode);

dsolve({ode,ics}) ;

Hello maple users,

I want to compare 5 functions and see which one gives the best result (highest score). Unfortunatelly, I can't say one function always gives higher results than others. I have 8 variables and it makes the comparison complicated.

I assume 4 of them are constant and the other 4 or not.

c=0.1

p=1

w=0.5

wu=0.8

for Pb= 0:0.025:0.20                   Pb and Pa are probabilities, between 0-20, 0.025 increments
    for Pa= 0:0.025:(Pb-0.025)      ** Pa is always less than Pb
        for Ha= 0:50                      Ha takes values between 0-50
            for Hb= 0:(Ha-1)            ** Hb is always less than Ha

I attached the data file. I appreciate if someone tells me how to compare these functions. Should I put more assumptions to make it easier? Thank you.

data1.mw

I use Maple 15 to calculate some (nasty) integrals at my university. Because our university also offers a server on which I can run my Maple program, I would like to do that. (instead of occupying a workspace). But at the computer on my workspace the integrals are evaluated fine, but on the server the integrals are just returned with no numerical evaluation.

I constructed a MWE to look where it goes wrong. I set the printlevel to 25 so I could see what was going on. The MWE was suprisingly simple, on both machines (via ssh) I executed within maple:

This of course would normally just give 2*sqrt(2). On my workplace-pc it worked fine and it found 2.828427125. The server just returned the integral. After looking at the steps, they where both exactly the same until the following part:

Workplace-PC:

         General_flags := {_NoNAG, _DEFAULT, _NoMultiple}

            NAG_methods := {_d01ajc, _d01akc, _d01amc}

                        Method := _DEFAULT

                          HFDigits := 15

                                       -12
                        HFeps := 0.1 10

                                            -9
                    HFeps := 0.5000000000 10

   oldEvents := overflow = default, division_by_zero = default

                         callNAG := true

                            fcns := {}

                  result := 2.82842712474618807

Server:

        General_flags := {_NoNAG, _DEFAULT, _NoMultiple}

           NAG_methods := {_d01ajc, _d01akc, _d01amc}

                       Method := _DEFAULT

                         HFDigits := 15

                                      -12
                       HFeps := 0.1 10

                                           -9
                   HFeps := 0.5000000000 10

   oldEvents := overflow = default, division_by_zero = default

                         callNAG := true

                           fcns := {}

       overflow = exception, division_by_zero = exception

It seems that the server has a problem with the singularity and thus throwing an exception, but I just don't get why. The Maple-versions are both the same.

Does somebody know what this could be?

Hello!

So as the title says i have a problem with solution of second order differential equation system.

The problem is that after i set some initial conditions and check the solution when the time equals zero, the solution graph is completely different from my initial conditions which is obviously incorrect. I know that i can change "spacestep" parameter, but i am not sure if it is the only way to fix the problem. Are there any other ways to fix this?

Here is a part of my code if it helps

r0=1.570796327
theta0=6.000000000

I need to minimize an Integration

Is there a package or an interactive package management utilities?

Hi there,

I am trying to compute the following, and I am getting this error.

> A := map(convert, M, unit_free)*Unit('m'*(1/'s'^2));
(I had to put the Unit('m'*(1/'s'^2)) because the original units were kNm/s^2 (kg), and even though I simplified it, it's still using kNm/s^2, and leaves the m/s^2 for some reason when I try to remove the units. I tried simply changing the units on the original matrix, but the units menu has disappeared from the right-click menu!!)

> B := map(convert, K, unit_free);

Loading RealDomain;

solve;

Error, (in assuming) when calling 'Engine:-Dispatch'. Received: 'should not happen: Rename expects the input to contain unknown functions'

Why is it giving me this error? omega is an unknown variable that I am trying to solve for. I am going a modal analysis, so maybe there is a better way to find omega?

Any help appreciated!

Raquel

I have document Maple.mw. I want to copy all text to mathtype. How do I copy and paste?

Link download: maple document

Why does the following not work?

factors(x^4-1)

Hi

I have problem with 3Dplotting of this piecewise...can anyone help me please?!

since i know the output will be a value between 0 and 1 can i plot it for different values of Mu in this range to eliminate a dimension?

Mu(x1, x2, x3) = piecewise(`or`(`or`(x1 > 55, x2 > 10), y >= 2), 1, x1 < 35 and x2 <= 10 and x3 < 1, (1/10)*x2, `and`(`and`(x1 < 35 and x2 <= 10, x3 >= 1), x3 <= 2), max((1/10)*x2, x3-1), `and`(`and`(`and`(x1 >= 35, x1 <= 55), x2 <= 10), x3 <= 1), 1-((55-x1)*(1/20))((10-x2)*(1/10)), `and`(`and`(`and`(`and`(x1 >= 35, x1 <= 55), x2 <= 10), x3 >= 1), x3 <= 2), max(x3-1, 1-((55-x1)*(1/20))((10-x2)*(1/10))))

Thank you very much in advance...

Maple show "

Error, (in simplify/hypergeom/baseHG) Maple was unable to allocate enough memory to complete this computation. Please see ?alloc"

after I finish the equations set and run it.

what's the reason?

Dear all,

I have one probem in using Maple in comparison with Matlab.

Generally, when using Matlab, I write a long program with 500 lines (for example) and where I use some matricial calculations and other. When I want to repeat this program for some parameters (variables) many times, I transform the program to a procedure "Function" with just adding the command Function in the start of the program.

When using Maple, I have a difficulty to transform a long program which I want to repeat for some variables to a procedure "proc". The program uses packages like LinearAlgebra and other procedures.

Is there a simple way to transform a long Maple program to a procedure which should be repeated many times for some variables in Maple. 

I have especially problems with the commands local, global, use (for packages), etc.. and the warning related to the variables. It is not easy for a long program with many variables to write them in local or global variables.

Thank you.

I find mapleform software   but I dont know how to use , and does anyone know another method to convert.  I know use 

> with(MmaTranslator);
> MmaToMaple();  

I can  automatically translated .nb files.  but this have  

Error, (in readline) file or directory does not exist
Error, (in readline) file or directory does not exist
Error, (in readline) file or directory does not exist
Error, (in readline) file or directory does not exist

another Error, missing operator or `;`

also I try to use 

> with(MmaTranslator);
> FromMmaNotebook(Mma_notebook_filename, options);

I still dont know how is works?  can you explains for me and show me some example  , here is my example files.plot.zip

Hello,

I need to model some spherical joints with damping.

Apparently, contrary to revolute joints, it seems that it is not possible to add damping in spherical joints. Indeed, contrary to the revolute joint where there is an option to put spring or damping element, i don't find this option in the spherical joint. 

Do you have a idea to model spherical joints with damping (without changing the spherical joint)?

Thanks a lot for your help

During a lengthy computation of mine - done using a well established and scientifically sensible external package - I get a Too many level of recursion error in PDEtools/NumerDenom.

Since it has always worked fine for simpler computation with the exact same code, I am wondering whether, with a bigger bound of the level of recursion, the computation could be succesful.

Which is the max level of recursion than maple allows?

Is it possibile to manually (at one's own risk) raise it, in the same line as raising, for instance, stacklimits kernel option?

Hello,

I want to simulating a mulitibody system, similar circular motion.

schematic diagram:

result:

Why the ball cannot keep on the circle?

 why_split.msim

Thanks