I just had maple downloaded and the command prompt and classic worksheet seem to work but when I try to use the desktop app maplew.exe the initial loading image comes up but then nothing happens. I don't know how to fix this :/ thanks.

Hello, I am looking to understand in more depth how the function isprime(n) works. After reading Section 6.2.4 'Other Primality Tests' of Padro's Introduction to Cryptography with maple, I understand that it performs some prior trial divisions before a Miller-Rabin test (of which it calls GMP) and then a Lucas test.

 I have also seen the post on these forums:

 https://www.mapleprimes.com/questions/204087-Maple-Specialprimes 

to see the result of showstat(isprime), which verifies my summary as above. I am curious as to what exact function is being called upon from gmp by gmp_isprime(n). Since there is no obvious analog function found in GMP, and the popular mpz_probab_prime_p() takes a second argument, which is not given here. I found the documentation gives a download of the GMP code used here:

https://www.maplesoft.com/support/downloads/GMP.html

I pose two questions, the first:

1. Since I do not own Maple 2017, is the result of showstat(isprime) the same as that given above in Maple18? COuld someone be so kind as to post a raw output of this below?
2. What function for primality test is being called upon in GMP, I am very familiar with GMP and the only test that can be called without a value of 'reps' (or rounds of MR) is found in demos/isprime.c in the GMP download maple gives, which uses mpz_probab_prime_p(n,25), i.e 25 rounds of Miller Rabin, but seems unlikely to just be used, as it is a demo.

Thanks,

Jake

hello everyone!!

I need to plot the function x^3-x^2-x-1, and in the plot I need to calculate de point X that make the function equals to cero (the cutting point with the x axis).

Thanks you!!

Hello dear!

Hope everyone is fine. I want to solve the system of algebraic equations. The answer of c[i]'s should be in term of q. Please see the attachment and fix the problem for any value of M. I am waiting your positive response. Thanks in advance. 

Help.mw

I am trying to model a parallel manipulator but I am receiving an error message

State variable'diff(diff(`Main.R41.theta`(t),t),t)' does not appear in dynamic or constraint equations.

I tried changing the Revolute joint 41 but the same error is repeated. 

You can find my model here: ParalelManipulator_v2.msim

Can you help me solve this issue? Thank you in advance!

Dear All,

I wanted to check the calcultations carried out in a Journal Article I was reading as I was not very convinced.

The objective is to find q1i, q2i, q3i in terms of px, py, and pz and constant parameters φ, a, b, h, and r.

I have realised that the results given by the article do not match with the solution to the dsolve command.

Could you please spot where the mistake is?

My Solution: IK_equations.mw

help me on thispde_solutionalpha.mw
 

Download pde_solutionalpha.mw

Dear All,

I'm stuck in a question, perhaps somebody can help. I have to solve the following equation: 

restart;
with(LinearAlgebra);
A := Matrix(3, 3, [[1, 3, 2], [4, 5, 1], [3, 7, 2]]);
      
M := IdentityMatrix(3);
   
eq := A^2*a+A*b+M*c;
K:= A^-2
Set := {seq(eq[i] = K[i], i = 1 .. nops(eq))};

But now I want to solve for a, b and c. I tried this with the solve function, but I gives an error. What do I have to do now?

Math

Hello,

I'm trying to find the way to manipulate matrix equalities easily and isolate them as variables like if they were simple real variables but keeping the matrix properties.  However, I couldn't find the way to do it efficiently without describing all the parameters of the matrices.  I'd like to keep them as variables rather than perform matrix operations when defining the expressions. I've attached a snapshot which describes my problem much better:pdf_kmaple.pdf.

For instance, I'd like to be able to isolate the expression that defines the state-space when I change the discretization method.  

I'm wondering if there's a generic way I can use to isolate other matrix systems as well.

Thank you very much for your help!

JMarc

fgh := proc (x) options operator, arrow; [x, x^2, x^3] end proc;

sol := proc (x) options operator, arrow; min(`~`[Re](select(proc (t) options operator, arrow; is(abs(Im(t)) < 0.1e-19) and is(0 < Re(t)) end proc, fgh(x)))) end proc;

eval('sol(x)', [x = X]);

eval(%, X = 1)

Why does this not work?

Good morning,

I've been having some trouble entering this expression in Maple 17.

My teacher suggested using this format, however, this format is from 2004 and certainly isn't recognized by the current version of Maple, as it keeps spitting back 0=0 no matter how many different ways I try to enter it.

Could anyone provide feedback on the correct syntax of how to enter this expression? Thank you very much for your time.

Exporting one plot in program works well:

       MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph.jpeg\",plot(sin(x)*cos(2*x)));");

But if I'm trying to export two plots, program stops working and prints no exception:
        MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph.jpeg\",plot(sin(x)*cos(2*x)));");
        MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph2.jpeg\",plot(sin(x)*cos(2*x)));");

What is the cause?

Hello,

I work in maple  2017，but the "interface "command seems doesn't work. But it works in the old version(maple 18). Does anyone know what problem with it?

problems with Norm.

Download force_net.mw

restart; with(PDEtools);
U := diff_table(Psi(`&psi;_2`, `&psi;_1`));
pde := `&psi;_2`*(diff(Psi(`&psi;_2`, `&psi;_1`), `&psi;_1`))+`&psi;_1`*U[`&psi;_1`]+2*U[] = 0;
&psi;_2 Psi(&psi;_2 + 1, &psi;_1)

   + &psi;_1 Psi(&psi;_2 + 1, &psi;_1) + 2 Psi(&psi;_2, &psi;_1) = 

  0
pdsolve(pde);
Error, (in pdsolve/info) first argument is not a differential equation

How can i solve it?