Hello, 

Im a chemical engineer student with very little knowledge of Maple and its possibilities (which seem endless). I have very little coding experience, even though i do write in LaTeX (which i suppose is referred to as pseudo-code). 

I figured, that as a student, i often run into the same number x problems, that each can be solved in x different ways. Since Maple is so good with units and calculations, aswell as defining variables. I could make some very smart notes, which would allow me to solve different (mostly simple) problems in a very easy and fast manner. 

Now, since i dont know much about Maple, i want to seek som help. 

How do i proceed to make such a document / multiple documents for my purpose? My first idea was to simply create a bunch of different variables defined to a given input, and then simply change the variables as i get a new problem. But i figured that there must be smarter and more neet ways to make this. 

Let me know what you think. 

Sincerely, Mikkel.

Hi,

I am working on a Windows machine. In older Maple versions, decreasing the font size for the screen display (via zoom factor) also decreased the font size for the printout. But now the printout comes with a pretty large font size and does not change when using the zoom factor. It practically makes no sense anymore to print. How can I decrease the fonts for the printout to my liking?

Thanks.

heide

I run the following working maplet:

Where "muutujad" is a procedure I defined and which returns the three inputs in the form [TF1,TF2,TF3].

It works fine, but if I insert "theta" as input, it of course stays in the string form, not Θ. Even if I copy the symbol and paste it in the textfied, it doesn't accept the symbol. Is there any way I can convert the text input to actual symbol?

How to create polynomial ideals over algebraic extensions of the field of  rationals Q with Maple?
The Maple help to PolynomialIdeals
"All package commands support computations over the rational numbers, algebraic number fields, rational function fields, and algebraic function fields, as well as finite fields. Coefficients from algebraic extension fields can be specified using radicals or RootOfs"
is too poor. I also don't find any example on this topic in examples,PolynomialIdeals.

Hi All,

I would like to create a 3D plot or surface plot and got stuck here and need your help.

I have a text file cretaed from C++ program. This file contains data in 8 columns. The first columns are X and Y values and rest of the columns are my calculated values based on X and Y. How can I visualize column numbers 3 to 8 based on X and Y values? Here is a sample:

0.00 0.00 0.378629 0.043703 0.259182 0.221199 0.181269 0.139292
1.00 0.50 0.151368 0.037717 0.451188 0.393469 0.329680 0.259182
2.00 1.00 0.034938 0.045672 0.593430 0.527633 0.451188 0.362372
3.00 1.50 0.003482 0.061922 0.698806 0.632121 0.550671 0.451188
4.00 2.00 0.000134 0.083040 0.776870 0.713495 0.632121 0.527633
5.00 2.50 0.000002 0.106675 0.834701 0.776870 0.698806 0.593430

Thanks.

How to compute integral of complicated function in maple 

int(e^(-s)*ln(1+s*e^-s)ds)from 0 to t 

i can not computed and how to simplify the integral because the wieght of calculation is to big?

Hello, I am working on an elektromagnetism assignment, and have hit a slight problem with the Physics[Vectors] package. The cartesian unit vectors are set to i, j and k. but at my school we have always used x, y and z for both the cartesian unit vectors and the cartesian coordinates. Is there a way to change this so that i am able to use _x, _y and _z istead?

P.S. This is my first post so sorry if it is badly done.

Hello everyone.

Tell me how to solve this equation grad(div(f(x,y,z)))+K*Laplacian(f(x,y,z))=0

Here, the function f defines a vector field.

I tried so

Download eq.mw

Hallo everybody,

I just started to use maple and I think I need some help from more experienced users.
I would like to transform the stationary Navier Stokes equations to toroidal coordinates.

The definition of my coordinate system is as follows:
x = -r * cos(sigma)
y = cos(Theta) * ( R + r * sin(sigma) )
z = sin(Theta) * ( R + r * sin(sigma) )

I tried to define the coordinate system and transform each term of the equation:

div( rho * CC) = -grad(p) + div(Tau)

I can transform the pressure gradient. However, I get an error for the divergence of the tensors.
Could someone please give me a hint on how to get the divergences?

Thanks!
Uwe

My code is printed below:

restart: with(plots): with(LinearAlgebra): with(VectorCalculus): with(linalg):

#torus defintion
x := -r*cos(sigma);
y := cos(Theta)*(R+r*sin(sigma));
z := sin(Theta)*(R+r*sin(sigma));
R := .35;
AddCoordinates(torus1[r, sigma, Theta], [cos(Theta)*(R+r*sin(sigma)), sin(Theta)*(R+r*sin(sigma)), -r*cos(sigma)]);
SetCoordinates(torus1[r, sigma, Theta]);

#pressure gradient
PressureGradient := Gradient(p(r, sigma, Theta, t));

#left hand side
c := vector(3, ([Cr, Ctheta, Cx])(r, sigma, Theta, t));
rhoCC := rho*multiply(c, transpose(c));
LHS := Divergence(rhoCC)

 of solution to plot a function?

with(DEtools):

sys := {diff(x(t), t) = y(t), diff(y(t), t) = -(1+(1/100)*t)^2*x(t), x(0) = -1, y(0) = 2};

sys := {diff(x(t), t) = y(t), diff(y(t), t) = -(1+(1/100)*t)^2*x(t), x(0) = -1, y(0) = 2}

dsn := dsolve(sys, numeric);

dsn:=proc(x_rkf45) ... end proc

My question is how to use dsn to plot functions E(t) and I(t) with respect to t in a given interval [t1,t2].

E(t)=0.5*(diff(x(t),t)^2+w^2*x(t)^2), w=1+t/100.  I(t)=E(t)/w.

Many thanks to everyone helping me : )

Hi to all

I had solve a set of ODEs using rkf45 method and I had plot it's Diagram now I need to have area under my diagram.what should I do? what is code?

hi all

i have a set of complex numerics, so:

1- i want the numeric with least valence(potency) in imagin particle,

2- i want print the real particle of this numeric.

for example:

A:= .5464691235-.4473247264*I, -.4563184747+1.*10^(-14)*I, .5464691235+.4473247264*I

i want print: -.4563184747

plz help

hi.please see attached file below and help me

Error, (in solve) cannot solve expressions with diff(diff(diff(f4(x), x), x), x) for diff(diff(f4(x), x), x)

thanks..error.mw

Hello please,

Can some one help me find inverse of this fucntion 

f(x) = binomial(x+r-1, x)*((d*x+1)/(1+d*x+(1/2)*b))^x*((1/2)*b/(1+d*x+(1/2)*b))^r/(d*x+1)

Thanks.

Question regarding solving the equation systems. 

See maple file for equations. 

Equation_questions_.mw