Pretty much the title.

At first I thought something's wrong with my vectors, but even something like <1,1,1>.<2,2,2> produces this error.

I have restart in the very beginning of my worksheet and with(VectorCalculus): right after.

I'm using the 64 bit version of Maple 18 on Windows 10, if this matters.

Say I have an expression like

diff(f(x),x)*cos(f(x));

and I want to evaluate it where the function f(x)=0 (without a priori knowing f(x)). Since cos(0)=1, I expect the answer to be simply diff(f(x),x); in general this won't be identically zero. However, if I try

eval(%,f(x)=0);

it replaces f(x) with zero everywhere, including in the derivative (as expected from the documentation) and returns 0.

So, my question: is there a way to evaluate an expression at a known value of a function (f(x)=0) without knowing the function?

It seems using convert/D manages to solve it, but I imagine there's a better way to do this. I've tried using RootOf(f(x)), but can't seem to make that work.

I'm trying to make a comparison between simulation data from CST and calculations done in MAPLE - the best way to do so is have both plots on excel so the formatting matches. I can export the data from CST as a text file, but am stuck when it comes to getting the data from MAPLE (specifically trying to record kz, dispf, and dispbeamf all together in one text file).

My implicitplot code works (the code for it shown below). Both dispf and dispbeamf are functions of kz.
implicitplot([dispf, dispbeamf], kz = -150 .. 150, f3 = 0.18e11 .. 0.25e11, color = [red, blue], numpoints = 5000)

Any advice would be greatly appreciated.

Hello,

I want to adjust values in a matrix. In the example matrix you will find some measurement errors (values around -4000 or 1). But these are definitely measurement errors. Is there any possibility to adjust these values to the surrounding values (~1500)...like in an interpolation. Can someone help me how I can do this with maple?

Ps.: the matrix is exported from maple into .xls

Matrix:
O233.xlsx

Thank you very much!

Dear users! 

Hope everyone fine with everything. I want to chage the format of x-axis in the attached file. I need the x-axis in degree like (-180^o, -120^o, -60^o, 0 , 60^o, 120^o, 180^o). Also I want the lable on y-axis as:

I am waiting your positive respons. 

Help_new.mw

The first update to the Maple 2018 Physics, Differential Equations and Mathematical Functions packages is available. As has been the case since 2013, this update contains fixes, enhancements to existing functionality, and new developments in the three areas. 

The webpage for these updates will continue being the Maplesoft R&D Physics webpage. Starting with Maple 2018, however, this update is also available from the MapleCloud.

To install the update: open Maple and click the Cloud icon (upper-right corner), select "Packages" and search for "Physics Updates". Then, in the corresponding "Actions" column, click the third icon (install pop-up).

NOTE May/1: the "Updates" icon of the MapleCloud toolbar (that opens when you click the upper-right icon within a Maple document / worksheet), now works fine, after having installed the Physics Updates version 32 or higher.

These first updates include:

• New Physics functionality regarding Tensor Products of Quantum States; and Coherent States.
• Updates to pdsolve regarding PDE & Boundary Conditions (exact solutions);
• A change in notation: d_(x), the differential of a coordinate in the Physics package, is now displayed as shown in this Mapleprimes post.

Edgardo S. Cheb-Terrab
Physics, Differential Equations and Mathematical Functions, Maplesoft

If I try to use unapply on a composition of functions, I seem to get the result in one of two forms:

unapply(f(g(x)),x);
# Result: f@(x -> g(x))
unapply(2*f(g(x)),x);
# Result: x -> 2 f(g(x))

I need the second form (without the @ composition operator): is there any way to instruct Maple to output the first result without the @ sign? Or is there some way to convert the first form to the second form (i.e. x -> f(g(x)))?

Thanks!

I would love to produce a fixed double cone but a movable plane so I could illustrate the various kinds of conic sections which are the intersection of the cone with the plane.  I would think this has been done, but I can't find and haven't been able to make much progress myself.  .......Edgar

Hi everyone.

I am trying to build a package in Maple out of a bunch of procedures that I have. To create the procedures, I write them on a Vim editor, than copy and paste into the Maple worksheet to test. In this way, it works (I end the procedure with ; and then I see all the text in blue and I afterwords test it).

I then gathered these procedures to a module, option package, and I do the same: edit on Vim, copy paste it to Maple worksheet and press enter to see a blue message "module() ... end module" in blue, and then I start playing.

However, I decided to add some more procedures to the module that was working. I have a new procedure that works (meaning when I copy to the worksheet it gives the blue text and I can call normally), but when I copy the contents of this new procedure inside the package, with all the others, and I copy everything to the worksheet, the package now fails to work. It gives a message "Error," in pink, no more text, and that is it. Does this sort of error sound familiar to anyone? Thanks in Advance,

Marcelo

I wanted to make a 3d plot with lines linking points, but I am struggling with it
(I couldn't find anything in the plot3d documentation, so it might not be supported, which would be odd as its such a normal thing to want to do)

I have tried with no success:

plot3d([1, 2, 3], [4, 5, 6]);
plot3d(Matrix(2, 3, {(1, 1) = 1, (1, 2) = 2, (1, 3) = 3, (2, 1) = 4, (2, 2) = 5, (2, 3) = 6}))

Any thoughts?

I wrote this simple set of instructions  (Maple 2015 and Maple 2016)

restart:
p := x -> sum('a__||k' * x^k, k=0..5):
p(x);    # returns a₀+ a₁x +  ... + a₅x⁵

p(1);   # returns a₀+ ... + a₅

p(0);   # returns 0 ...  not a₀

Probably so huge a mistake that I can't see it !?!?!?

Could you please help me to fit it ?

TIA

LettR_curvefitting.mws

Am in the process of trying to addsome animation to a 2D letter R, namely to make the 'stalk' move.  I lost the output and managed to retrieve it by adding  verboseproc=0, and printlevel:=5.  However printlevel:=5 gives an excessive amount of output and anything less than 5 doesn't give enough output.  The code is messy asI've been experimenting with general curve fitting.

   Any help gratefully received. 

I have a problem with writing this equation in maple.

the equation is: 

I want to write this equation in maple, so I write it in this way:

for k from 1 to 7 do tau[k] := add*(d(k, j)*(diff(theta[j](t), t, t)), j = 1 .. 7)+add(add(c[i, j, k]*(diff(theta[i](t), t))*(diff(theta[j](t), t)), j = 1 .. 7), i = 1 .. 7)+phi[k] end do:

but I see this error: Error, index out of bounds 

I appriciate if you help me find the problem.