> restart; with(VectorCalculus);
> P := proc (rho, theta, phi) options operator, arrow; `<,>`(rho*cos(phi)*sin(theta), rho*sin(phi)*sin(theta), rho*cos(theta)) end proc;
> r[1] := proc (t) options operator, arrow; P(2, (1/2)*Pi, t) end proc;
> F := VectorField(`<,>`(x, VectorCalculus[`+`](y, R), z), coords = cartesian[x, y, z]);
> F[1] := evalVF(F, r[1](t));
                Vector[column](%id = 255051836)
> F[1] := evalVF(F, r[1](t));
Error, invalid input: VectorCalculus:-evalVF expects its 1st argument, F, to be of type {procedure, Vector(algebraic)}, but received Vector(3, {(1) = Vector(3, {(1) = 2*cos(t), (2) = 2*sin(t)+R, (3) = 0}, attributes = [space = (module () local _origin, _coords, _coords_dim; export GetCoordinates, GetRootPoint, Vector; end module)]), (2) = y+R, (3) = z}, attributes = [vectorfield, coords = cartesian[x, y, z]])
> 

Hey,

    I'm doing a little experimenting on Maple and I want to display 3 Matrixes side by side with text explaining what is what. I have a for cycle in which 5 sets of 3 matrixes are made. And my goal is to display each of the 5 sets.
How would I go about doing that? I've tried the following:

display(Array(print(cat("Matriz A", k, AA[k])), print(cat("Matriz B", k, BB[k])), print(cat("Matriz D", k, DD[k]))))

But with this I end up getting this instead of what I want:

http://i.imgur.com/p087Upr.png

Any ideas are welcome, thanks in advance.

Rafael.

I found the following: 

Question:matrix multiplication element by element

Does this not apply to vectors?  If not what syntax is required?  I cannot seem to execute this simple operation which I can easily do in MATLAB.  If you have such a capability why is it not clearly documented in the HELP pages?

HI, I'm new to maple and am having trouble taking partial derivitives. I couldn't find anything in the documentation that seemed to resolve the situation, and can't be the first person to stumble through this part of Maple.

Namely, it seems like the exponential function causes an extra "ln()" term to show up in the solution. I've tried with e^(y) and exp^(y) but nothing seems to be working. When i use the same markup up in wolfram and matlab and Ti-CAS i get the "correct" solution.

I attached a screen showing my input and output.

thanks for any insight!

Dear Maple experts,

I would like to teach volume of solids generated by revolution of an area between two curves by washers & cylindrical shell methods uisng Maple technology to my students. In this regard, I request the Maple experts to provide easy commands to meet my requirement.

With thanks & best regards.

Mr.M.Anand

Associate Professor in Mathematics

How do i implement Runge-Kutta of order 6 for a sytem of boundary value problems on maple

i could have sworn that when itegrating a gaussian maple will write it in terms of the erf functions... but i end up with:

gg:=A * exp( - ( (t - t0) / (tau) )^2 );
val1:=int(gg, t=-x0..x1) assuming t0::real, tau::real, x0<x1, t0>x0, t0<x1, x0::real, x1::real;  #or with no assumptions
 

the results is just gg unchanged... Doing:

convert(val1, erf)

does not help. I can set t0 (or transform it away), and it works, but I was hoping maple would not require this. 

Any thoughts how to help maple with this?

Mathematiaca can read my mind without issues:

Do others as well get the message "The resource you are looking for has been removed, had its name changed, or is temporarily unavailable" when trying to access the thread Mapleprimes enquiry confusion?

I've been using maple every few years since 1986, but am a bit rusty again.  I want to save a sequence of variables created in a do loop. I'm sure this is an old easy question, but can't find the answer searching.  For example

for i from 1 to 10 do
a:=i:
save a, `i.m`:
od:
quit

Keeps overwriting the file i.m, but I want files 1.m, 2.m, 3.m, etc.  Don't see how to do this, but should be easy.  

Hi all, i have a problem someone help me.

Define per(f(a,b,c)) = {f(a,b,c), f(b,c,a), f(c,a,b)}. I want to write a function removePer() that removes the permutations, example:

ds := {a, b, a^2, b^2, c, c + 2a, a - b, c^2, a + 2b, b + 2c}

then removePer(ds) return {a, a^2, c + 2a, a - b} because per(a) = {a, b, c}, per(a^2)  = {a^2, b^2, c^2} and per(c+2a) ={a+2b, b+2c, c+a}. Note that removePer(ds) can return {b, a^2, c + 2a, a - b} or {c, a^2, c + 2a, a - b}, ...  but just one result.

ds := {ab, bc, a - b^2, b - c^2, a^2, c - a^2},

then removePer(ds) return {ab, a - b^2, a^2}.

Thank you very much.

Spherical coordinates in electrical engineering are rho theta phi meaning distance, zenith and azimuth

making a righ-handed trihedron

In MAPLE I find a left-handed trihedron.

Can I change the order of coordinates?

Hi dears,

How can I draw the solution of the following 3d linear inequalities in Maple?

A:={-x-y+3*z >= 0, -x+2*y >= 0, 3*x-2*y-z >= 0, x > 0, y > 0, z > 0}

I am looking forward to hearing from you

Sincerely yours.

hi.how i can solve or fsolve this equations?

i can not with fsolve?

thanks alot

SOLVE.mw


Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/SOLVE.mw .
 

Download SOLVE.mw

Let say I have a linear system of equations with 28 unknowns (Z1, Z2, ..., Z28).

I know that dimension of space of solution > 0. I want for all unknowns to be expressed only by (let say: Z20, Z21, ..., Z28).

How to specify these free variables? I'm pretty sure it is implemented in Maple.

Hello. My question is enclosed in the Maple file. Using DrawGraph I get a complicated mess.

graph.mw