Hello, I wonder if someone could explain why, in the attached file, when I collapse the execution groups connected with the 3 equations the label (2) disappears but not the labels (1) or (3). Is there a workaround for this? Thank you View 2292_Label (2) disappears.mw on MapleNet or Download 2292_Label (2) disappears.mw
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I have this problem with the sum of a recursive seq: > restart; > with(student): > with(plots): Warning, the name changecoords has been redefined > a:=5.5*10^(-3): > R:=10*10^(-3): > d:=n-> ((-1)^n)*(R-(a^2)/(R+(-1)^(n-1)*d(n-1))): > d(0):=R: > afs:=seq(d(n),n=0..100): > q:=n->(-1*a*q(n-1)/(R+(-1)^(n-1)*d(n-1))): > q(0):=a*4*3.14*8.85*10^(-12): > lad:=seq(q(n),n=0..100): > sum(q(n)/(sqrt(y^2+(z-d(n))^2))/(4*3.14*8.85*10^(-12)), n=1..100); Error, (in q) too many levels of recursion How can I avoid this, is the syntax wrong? An additional question, if I want to plot the seq's how do I do this? I'm a bit over my head here when it comes to maple knowlegde.

Hi - Its me again. Let me try to explain my question with the following: y := proc (t) options operator, arrow; a*exp(2*t)+b*t*exp(2*t)+c*t^2*exp(2*t) end proc solve({3*c = -9, 3*b+12*c = 8, 3*a+6*b+2*c = 4}, {a, b, c}) It would be really cool if there was some way I could take the output from solve (values for constant a, b and c) and automatically assign these values in expression y. I can manually take these and type out y all over again but I think there's got to be a way that Maple recognizes that, alright, here's a, b and c and I'll just assign their values to a, b and c in expression y.

I have a class with about 400 students. For the new term I opened a new class which will have about the same audience like the one before. Therefore I would like to copy all student accounts but start with empty gradebooks. As far as I saw it's possible to upload a class roster but it's not possible to download it. Could anybody tell me an easy solution for this problem?

Hi, how can I stop a procedure of maple a use the global variables create before stop the code? Thanks Marco

Hi.. I'm a quite new user of maple, so I've got a question: I'm trying to solve a ode numeric with maple. I've got a solution, a procedure where I a can get a value of y(x) for any x.. (and also plot the "function") Additionally I would like to have a procedure which can give me the slope of the graph - y'(x) for any x. Can anyone help me to solve this problem? My code so far is: lignsub:=diff(y(x), x, x) = 0.7904982116e-3*sqrt(1+(diff(y(x), x))^2)/(1+0.1012020000e-2*sqrt(1+(diff(y(x), x))^2)) `løsning` := dsolve({lignsub, y(0) = 0, (D(y))(0) = 0}, type = numeric, output = listprocedure)

Hi! Could somebody please tell me if there is a student version of the Global Optimization toolbox? Thanks, Raj By the way, I bought Maple 11 today...its awesome!!!

Am I having an off day, or does the view option for plots (and 3d plots) not work when one has axes=NONE? For example, the plots plot( x^2, x=-1..1, view=[-2..2,-2..2], axes=NONE); plot( x^2, x=-1..1, view=[-2..2,-2..2], axes=BOXED); produce completely different plots, with the view parameter being ignored in the first version. Can this be fixed? It seems a bizarre question, but I was trying to create a bit of space around a 3d plot so that it can be rotated without falling off the edge, and I can't figure out how to do that if I don't want axes.

Hi - I'm trying to collect cos(8t) and sin(8t) in the following equation: (-64*a*cos(8*t)-64*b*sin(8*t))*exp(6*t)+65*(a*cos(8*t)+b*sin(8*t))*exp(6*t)+81*c*exp(2*t) but the following command just spits out the same exact thing: collect(lside, [cos(8*x), sin(8*x)]) Any suggestions would be appreciated. Thanks.

Hi, I have a ‘slight’ problem (you will probably recognize it Joe! :-) ). It concerns the values of Tau, omega in my worksheet (see below). If I set Tau=0.7, omega=0.7*m*Eta everything is rosy, and works fine. If I start tweaking these values (which I have to) things go a bit pair shaped. I either get an error message after the first call to dsolve (e.g. when tau=0.5, omega=0.7*m*Eta) : "Error, (in dsolve/numeric/checksing) ode system has a removable singularity at r=1. Initial data is restricted to {Phi(r) = .20650095602297*diff(Phi(r),r)+.82088920025557e-1*I*diff(Phi(r),r)}"

I don't know how much interest this has for people on this forum, but I have just discovered (I think) a difference in how M10 and M11 handle differential equations. I just received M11 late last week, and when I tried to run in M11 a worksheet I had developed in M10 I got an error. It had to do with the fact that M10 gave me 2 solutions to a DE, whereas M11 gave me one. The first solution which M10 gave me was r(theta) = 0. M11 skipped this trivial solution. Arguably this is a better way to go, but it can cause problems for older worksheets, as it did on mine, where my next line tried to parse the second solution of the previous line. I have uploaded a file which illustrates this. Is it possible that there is some setting I could change in M11 to make it give me the same set of solutions as M10 gives?

hi! Could somebody tell me how to evaluate this double integral in Maple int(int(A*sin(2*Pi*B*(alpha-beta))/(Pi*(alpha-beta)),beta=-T/2..T/2),alpha=-T/2..T/2) Thanks, Raj

I'm an older adult, getting back into math and realizing how much I've forgotten. Likewise, I'm new to maple and just made a discover. Anyhow, I'm wondering if I'm looking at this correctly. The following: sum(piecewise(n <>

Hi, I am trying to add some useful inverse Laplace transforms to Maple's integral tables. I am frustrated that these transforms will only be recognized subsequently if they are entered in exactly the same format. For example, if I type: invlaplace(exp(-p*sqrt(s)/s),s,t); I get: invlaplace(exp(-p/s^(1/2)),s,t) but if I add this transform to the table: addtable(invlaplace,exp(-p*sqrt(s)/s),erfc(p/(2*sqrt(t))),s,t); then I get: invlaplace(exp(-p*sqrt(s)/s),s,t); erfc(1/2*p/t^(1/2)) However, if I change the p to an alpha: invlaplace(exp(-alpha*sqrt(s)/s),s,t);

Hi, I'm currently investigating whether share prices can be successfully be modelled as a random walk and as part of this wish to include a program to generate such walks using maple. I've already been able to produce a program (with some help) where the output is a simple ramdom walk. The inputs I had were the starting value of the walk, the probability of an increase ( where 1 minus this is the prob. of a decrease). how much to increase by at end stage. Only now I've done some research and found that there are two potentially ways of how share price are distributed either normally, or by a scaled t-distribution. Any ideas of how to implement these? Any help is greatly appreciated.