MaplePrimes Questions

Hi everyone, Could you please have a look at my maple file. Im trying to solve a set of 4 differential equations but maple takes ages to solve and doesnot give the answer at the end either. The reason can be that the equations have to high power. Do you know any other dsolve method I can use or anything I can do to fix this problem? Thank you very much! Jinny View 3868_Pressure drop on MapleNet or Download
Hi, I created a scatter plot in a Maple 11 Worksheet by creating a list (below) and right clicking and using the Plot tools. However, I want to graph a function on the same scatter plot. Can this be done? L := [[32, 6], [48, 14], [64, 24], [80, 38], [96, 55], [112, 75]]
Is there a package available in Maple that converts between number systems ? e.g., binary, octal, hexadecimal. v/r,
Thanks to all the wonderful and timely help I received concerning my previous troubles with the LegendreP function. It was all helpful. I think I'm very bad at procedures, but I struggled in an effort to gain more personal knowledge, in addition to solving this problem and came up with a very simple and rudimentary procedure. It is called P[legend](l,m), where l and m are the two arguments received in that order. Can anyone look at this procedure and suggest improvements for efficiency, aesthetics (more elegant simpler methods), possible bugs, etc. Your critiques on my effort would be greatly appreciated.
Somewhere along the line, my output format switched to display the most significant digit in the tenths decimal place. I can't figure out how to change it back to the unit (one's) decimal place. Anybody know where to find this setting? Thanks, Brad
None of these suggestions allow for the evaluation of the directional derivative at a particular point, in this case (1, -2, 3). (I cannot make the command line suggestion work at all - error: "expects its 2nd argument, v, to be of type ('Vector')(algebraic), but received [x, y, z]") Surely, evaluation can be done without an additional substitution statement. John Vawter
Hello I have a very strange math question and I want to verify the result with MAPLE but I really have no idea why (we have no "Maple" notes with our course yet)... I want to find the gradient of exp(x*y*z)*cos(x*y^3*z^2) and exp(x*y)*cos(x*y^3*z^2) at point (0,0,0) with direction 2i-3j+k. It seems like a very strange question, the gradient at (0,0,0) of both functions seem to give 0. I don't really care about the direction, if only I could verify the gradient at (0,0,0), it would be great. Thx
Hey, I'm trying to make a density plot for the hydrogen wave functions in maple I only see how to make a density plot in cartesian coordinates, but I want to make a density plot in polar or better in 3D spherical coordinates.
I am trying to get the directional derivative for a 3 variable (x,y,z) function. Maple is saying: Error, (in Student:-MultivariateCalculus:-DirectionalDerivative) include points for only the x and y coordinates for entry DirectionalDerivative(x*exp(y)/(3*z^2+1), ([x, y, z]) = ([2, -1, 0]), [1, -2, 3]) Any help would be greatly appreciated. Thanks, Dave
Does anyone know how to get the function

LegendreP(1,1,cos(theta)) to return the value of sin(theta) ?

I'm using the associated Legendre function.

I think the first 1 represents the degree of the polynomial, and the second 1 stands for the derivative order. (I'm not sure).

When using the associated Legendre function, LegendreP(u,v,cos(theta)), I get the expected results only for certain combinations of the values of u and v.

The problem has to do with the eveness and oddness of u and v.

I also tried manipulating the global variable, _Env...? (Can't recall it's full name).
Hi I was wondering.. I am solving a set of differential euqations and i get my table of values: soln3:= dsolve(... I would like to extract those values to excel... Is there a command for that? Thanks! Elinor
Does anyone know how to perform maximum likelihood estimation in maple 10 or 11 with multiple unknown parameters? If pop100 is a vector of floats, then code like: MLE(LogNormal(mu, sigma), pop100) yields this error message: Error, (in Statistics:-MaximumLikelihoodEstimate) when calling '`one of {op, module () local OptionsTab; export FisherInformation, Information, Likelihood, LikelihoodRatioStatistic, LogLikelihood, MaximumLikelihoodEstimate, Score, GetValue, ProcessOptions; LogLikelihood := module () local OptionsTab; export ProcessOptions, MakeProc, GetValue; OptionsTab := table([(OptionParms)=(table([(samplesize)=[deduce, {posint, identical(deduce)}],(weights)=[Array(1..0, []), {rtable}],(ignore)=[false, {truefalse}]])),(PositionalParms)=(table([]))]); ProcessOptions := proc (parms::list, other::list, opts::table) return :-ProcessOptions(0,other,Statistics:.
Hi I was wondering I have a few sets of solutions for different initial conditions and I would like to plot them in the same graph: with(plots); plotF7 := odeplot(soln,[(10.46-F1(z)) `/`(10.46),F2(z) `/`(10.46-F1(z))]... But for soln soln1 soln2. What could I do?
I have used the components palette to build a user interface for a complex data analysis and display task. It involves multiple worksheets running in shared kernel mode. The main worksheet is organized as a 3x2 table, each cell of which uses components to display a set of some 25 related data parameters and controls. A second worksheet contains buttons and plot regions for graphing the columns of various data Matrices associated with the parameter sets. The parameters are stored in databases, and the Matrix data have been generated from the parameter sets as input by a stand-alone Fortran program. A third worksheet contains spreadsheets for examining the data in the Matrices. The various buttons on these Worksheets call the procedures in a library devoted to the interface, which procedures accomplish things like loading parameter or data files, clearing or updating the displayed parameter sets, executing data analyses, etc. Keeping so many components straight in my mind demanded that I adopt a uniform naming scheme, so the generic component names have all been replaced by my mnemonic ones which are derived from the underlying data content of each component. All this is pretty much nothing fancy, just as it MUST be, given what I'm trying to accomplish. Now I want to augment the user interface to include another set of parameters, controls and data Matrices all of which are disjoint from the existing ones.
I've just encountered a problem that I've never seen before, although I suspect I'm overlooking something very simple, and I was hoping to get clarification. In the course of defining a function I wanted to have a sum going over the indices of a vector; something like, sum(abs(x[i]-y[i])^2,i=1..3), and I receive "error, bad index into vector." This construct works fine with the seq command, so I'm not totally sure why it fails when using the sum command. Any ideas would be greatly appreciated. Thank you. Keenan
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