In maple 11 I have defined: f := x -> e^(-x)*sin(x); then I have tried to get maple to draw the above mentioned: plot(f(x),x=0..2*Pi); What happens is that I see a the coordinat-system but with no drawings in it. Can anybody help me? Regards Simon

I need help. A homework problem superimposes a graph atop a DE. What am I doing wrong: _____________ plot1 := phaseportrait(eqn,y(x), x=-0.25..0.25, [[y(-1/2)=2],[y(3/2)=0]],titlefont=[TIMES,ROMAN,18],title=`Sec 2.1 #17`, color=grey, linecolor=[red,blue]): plot2 := (1/2)*x^2: display([plot1,plot2]); Error, (in DEtools/phaseportrait) the 'number' option must be specified before initial conditions Error, (in plots:-display) expecting plot structures but received: [plot1, (1/2)*x^2] _____________

Fourier transform of a non-integrable function ... Dear all, I am working on Fourier Transform of a non-integrable function. And I am working on the numerical implementation of the FT, using FFT. Let's call this function F(v). One example is F(v)=-1/(5*i*v)*(1-exp(5*i*v)) The function has a 1/v term in its asymptotic expansion, which corresponds to a jump or Heaviside function in its transform. Using FFT, I can see the jump, with some overshooting after the jump and undershooting before the jump, along with some ripples. I want to reduce these artifacts as much as possible, because I am going to integrate this transform against other functions later. Hence obtaining a smooth function without much numerical artifacts is vital. How do I do that?

How do I plot a vector-valued function with maple11? Example: r(t)=(t)i+(t^2)j+((1/2)t^3)k I am a new user, so if you could explain to me step by step that would be helpful. Thank you, Jerry8273

I am wanting to have maple11 convert a point, example(x,y,z), from one system to another among the rectangular, cylindrical, spherical coordinate systems. does anyone know how to do this. I am a new user of maple, so please explain step by step or show an example. Thanks

I had the pleasure of visiting Oxford while on vacation in England. I regret that I did not get a chance to visit the NAG headquarters there, but that thought gave me the idea for this next blog entry. The Optimization package for local optimization uses as its underlying engine the NAG E04 optimization suite. It is possible to use the Optimization package without knowing the internal workings of the commands. However, for those of you who are interested in such details, it is possible to get more information. If you set infolevel[Optimization] to 2 or higher, the names of the NAG routines (e.g. E04UCA) are displayed. It is useful to set the infolevel value in any case, as the messages provide valuable information about how the computation is proceeding.

I saw a function in Maple that would take a fraction like 77/45 and come up with a simpler version that was close to that value. In this case 9/5. Now I can't remember what that function was called and where to find it. Anybody seen this? Thanks!!

The command root(f(x),x, K) to compute roots of a univariate polynomial f(x), (let f(x) have integer coefficients), will not return an answer unless *I* do the WORK FIRST of FINDING THE ROOT to determine over WHICH FIELD (algebraic field, if it's algebraic) some of the roots of f(x) lie. The help manual demonstrates this with simple quadratics only. One writes the radical part of the quadratic solution for K, i.e. root(x^2-3,x,3^(1/2)) Mathematica had the complete Cardano formulae programmed in for both the cubic and the quartic polynomials with completely indeterminate coefficients.

Hey I am totally clueless on how to go about finding the vector projection of b on a and the scalar projection of b on a. a:= [0,-8,4] b:= [7,6,-20] please help! thanks

Hello all, you were very helpful the last time I had a question, I hope you can help me again here. I have a system of differential equations that can be manipulated in two way, each has its own problems 1) I can define the system of equations including a piecewise function. The test of the piecewise involves the ratio st(t)/sz(t) being relative to 1. When I attempt to dsolve,numeric this formalism it gives me an error that it cannot convert to an explicit first-order system (not that I asked it to convert by the way). 2) In place of the piecewise I can have int(1/(1+sqrt(st(t)/sz(t))*sin(theta)),theta=0..Pi) which should evaluate to a real number, and is incidentally where the piecewise function comes from. However then dsolve tells me that it cannot have an integral in a differential equation.

I'm a new mac owner and for a course i need to download and use Maple 11. So I installed it and opened it...andrun for 15 seconds but then a warning will pop up saying Maple Initialization Error and then "invalid or missing license file" followed by computer jargon i can't even understand. I've looked at Maple and Mac support sites alike to no avail. I suspect it had something to do with my firewall, in which case i'd be grateful for so direction on how to correct it. Thank you for your time. sincerely your friendly Maple 11 (would be) user

Hallo, I have a problem with LSSolve that is quite strange. When I give the command Optimization:-LSSolve( e ); I get the error "invalid optional parameter or workspace size", while if I send the same problem data to the other solvers, ie, as Optimization:-Minimize( e^2 ); or as Optimization:-NLPSolve( e^2 ); it seems to work, despite the fact that the same solution method is used (method = modifiednewton). The problem does also depend on the size of the problem. If e is small and contains only 4 variables it works with all the solvers, but if it contains 6 variables or more LSSolve doesn't.

Hi all, I'm sort of new to Maple and I got the following problem (just an example): I have 3 equations of the following form: sin(x)=c+d; cos(x)=e+d; tan(x)=e; Now i want to solve the set of eqns to the variable c by automatically substituting d and e. The result should be: c=sin(x)-cos(x)+tan(x) Furthermore it would be very good to know, how to specify which variables should be subsituted and which should remain. I tried variations of eval, subs, algsubs and solve.. Help would be greatly appreciated!

I have been experiencing the following problem: I define for example the expression x^2 and use the context menu to get a 2D plot then I define another such as 40-x^2 and drag it to the plot region and nothing happens. Has anybody encountered this problem before? Is this a bug with Maple or my computer? Thanks