I received an (automated) email, which called attention to an update.

Where can I find the update?

Thank you, Jan Drösler

Hi there,

I have been using Maple for a while now.

I installed Maple on my Desktop PC, but I am experencing horrendous loading times, and just in general, a slow client. When I look in Task Manager I can see Java Platform SE Binary run at 0% CPU or close to 0% CPU. It uses about 600 MB of ram. I think this is the issue. On my laptop it runs much higher, and I experience no issues. My Desktop PC is significantly better than my laptop. I am running a i7-7700k with a RTX 2080, so there shouldn't be any hardware worries. 

Does anyone know what is causing this? Simple math like 1+1 takes time to execute. It is very slow.

Hope someone knows what to do.

Thanks,

Kritix.

Hi everybody

My question comes back to singularities within a differential equation.

Consider a Non-Linear differential equation of y(x), say Eq1.

When we solve this with dsolve ({Eq1, ICs}, type=numeric) we can extract the value of y(x) for each independent variable x.

Now if Eq.1 admits a singularity (for example at x=x0) that can not be removed the following message appears:

Error, (in unknown) cannot evaluate the solution further left (right) of x0, probably a singularity.

By left(right) Maple means that the solution cannot be evaluated for x<x0 (x>x0).

However, in some situations, the Linear form of Eq.1 behaves regularly for all of the values of x, I call the Linear equation as Eq.2.

Now my question is:

How can I make a conditional expression with proc and for commands that do the following requirements: 

1. Detect the singular point x0 by running a loop over x for the numerical solution of Eq.1 and write the value of x0 for different initial conditions , since the value of x0 depends on initial conditions.

2. Find the value of y(x=x0) by solving Eq.2 as the linear equation is no longer singular at x=x0.

I want to find out the suitable algorithm through which I can perform the above procedures.

Thank you very much and best regards.

Hadi

Hope that no one minds a beginners question.   How do I enter non-null k=0 robertson-walker tetrad in the physics package?  Not the tensor package as that has depreciated or the differential geometry package as notation is different there.

why is  the figure  so weird ? How can I get the smooth trajectories of the ode system?

Download as22a.mw

Dear Sir/Madam, I am new in maple and willing to use an old (yet tested) Maple V code. The program first evaluates two integrals numerically, which depend on the values of "d" and "s" (user-defined), and then computes the values of a cumulative distribution function. The problem is that, when running the code on Maple 2018, the evalf(Int) of the first integrand (named "ex1") results in "Float (undefined)". I would really appreciate your help. Thank you in advance.

#Maple V program

assume(x, real, y, real, c1, real, c2, real);
d := 3:
s := .9:
ex1:=(1-exp(-(d-y)*I*x))/I/x*exp(y*I*x/(1-I*x)):
ex1:=simplify(Re(evalc(ex1))):
f1:= unapply(ex1,x,y):
ex2:=(1-exp(-(d-y)*I*x))/I/x*exp(y*I*x/(1-I*x))/(1-I*x):
ex2:=simplify(Re(evalc(ex2))):
f2:=unapply(ex2,x,y):
t1:=evalf(Int(f1(x,s),x=-infinity..infinity));
t2:=evalf(Int(f2(x,s),x=-infinity..infinity));
cumulativeprob:=evalf(subs(c1=1/2,c2=1/2,1-((c1*t1+c2*t2)/(2*Pi)+c1*exp(-s)/2)));

cumulativeprob:=.2503779941

I get the same result here where I expected a difference to be acknowledged by the split command. Is there a more efficient way of handling this problem other than the substitution for another character, followed by executing the split  command, then substituting the substituted character with the original ?(here ":")




 

Download split_help.mw

How can I set Maple 2019 so that all inputs are of the color red?

I am using a Lenovo Notebook 64-bit.

Thank you, Jan Drösler

Plot the "moment curve" f(t)=(t,t^2,t^3) over the interval 1≤t≤2 and a tangent line at the point when t=1. Include both plots in the same display, with the moment curve red and the tangent line blue.
 

Plot the boundary of the rectangle with bounds 1≤x≤4 and 2≤y≤3 by parametrizing and plotting all four boundary segments in the same display

How do I simplify KdV equation in Maple by using =fxt))xx)?)

Download KdV_simplify

Is there lifting function for polynomials or algebra use?

expect input a list univariate polynomial , then output a list of polynomials of two variables.

it should be the reverse operation of projection.

Which library has this function in maple 12 or maple 2015?

I am a beginner of MapleSim. I study the MapleSim User Guide. I follow the Tutor 8:Modeling Hydraulic System. But the following issue occurs, as shown in the picture. I bet I follow the guide carefully.

Also, I find that if I open the User's Guide example,Chapter 6, Analysis of Simple Hydraulic System Network, which is the standard example,I simulate it and it works well. But if I delete the probe, and attach a probe at the same place , selecting same values to measure, and simulate again, it failed, giving the same error description. I need your help,please.

problem_with_Analysis_of_Simple_Hydraulic_Network.msim

I am trying to write a metric in Maple 2019, using the Physics package in Cartesian coordinates. I know that there is already a pre-installed way in which to set the coordinates to Cartesian, namely, if we have something like 

Setup(coordinates=cartesian);

or similarly, using the Coordiantes calling sequence, such that we may define something like

Coordinates(A=cartesian);Setup(coordinates=A);

yet, if I am not mistaken, this gives the coordinates in the following form: {x,y,z,t}, yet I seek to define the metric in the following, perhaps more arbitrary coordinate system, {x1,x2,x3,t}. Is there any way to setup the coordinate system to read like the set I just described, such that I can then take a norm of these three spatial coordaintes to be |x|? Any help would be greatly appreciated. 

   It would seem that the option style = planar  of DrawGraph()    is  failure when some graphs are planar.
   For example: 

treeof5:=[NonIsomorphicGraphs(5,4,output= graphs,outputform=graph,restrictto = connected )]:
DrawGraph ~ (treeof5, stylesheet=[vertexborder=false,vertexpadding=20]);

 

We know tree is planar graph obviously. But when I add the option style = planar ,  drawing of the first tree of list displays an error :
Error, (in GraphTheory:-Graph) vertex 1 cannot be its own neighbour in list of neighbours

I did not find any reason to explain.