Below is a small tidbit of code that operates on the matrix vel and updates its values.  When I check the values of the indices in the matrix, every single element, barring vel(1,1), vel(1,2), and vel(1,3), is equal to 0.

vel := Matrix(3, 241, datatype = float[8]);

step := 0.1;

vel(1, 1) := 5; vel(2, 1) := 95; vel(3, 1) := 3;

UpdateAllVelocities := proc (i, vel::Matrix, accel::Matrix, step);

#I understand these calls are quite pointless......

With a lot of languages, the compiler will issue warnings when the user does something that could cause errors. I often find myself mistyping or misspelling words in Maple, and this often leads to runtime errors.  Is it possible to make the interpreter issues warnings when I implicitly declare a variable or do something similarly risky? 

Here's my first attempt at posting some 2DMath on this site.

First, I will paste directly from 2D output in a running Standard GUI Maple session.

BesselJ(0, x)+GAMMA(Psi)-sqrt(abs(omega))

How can I build an increasing list using a loop?

Something like this

a[1]:= [...]
a[2]:= [...]
a[3]:= [...]

c[1]:=a[1]
c[2]:=[op(a[1]),op(a[2])]
c[3]:=[op(a[1]),op(a[2]),op(a[3])]

etc...

I thought about using a loop but then got stuck

for i from 1 to 3 do
  c[i]:= ???

Hi everyone.

I have been experiencing a problem trying to solve a coupled system of 4 differencial equations, 2 PDEs with 2 ODE.

My problem is that a got a message back as I try to solve the system:

"Error, (in pdsolve/numeric/process_IBCs) improper op or subscript selector"

My first question is: Am I defining the IBCs rightly?

If not, I don`t have a clue on how to solve this problem, I really apreciate some help out here.

Thanks for all the above input.

Now I have imported my text file using TOOLS->ASSISTANTS->IMPORT DATA .

Text file has 3 columns: x, y and z.

How can I get a contour plot 3d from this matrix i.e. plot z using x and y values as axes.

Thanks again.

Dear Colleagues, I need your cooperation.
How to make the following graphs to illustrate the SVD of a Matrix

How do I insert a hyperlink with this new site?  The link icon on the toolbar is grayed-out.

Just a simple histogram, but how do I select the values from the graph. 

op(b) pulls out the data of the graph

POLYGONS([[1., 0], [2., 0], [2., 1], [1., 1]], [[2., 0], [3., 0], [3., 0], [2., 0]], [[3., 0], [4., 0], [4., 1], [3., 1]], [[4., 0], [5., 0], [5., 2], [4., 2]], [[5., 0], [6., 0], [6., 1], [5., 1]], [[6., 0], [7., 0], [7., 1], [6., 1]], [[7., 0], [8., 0], [8., 1], [7., 1]], [[8., 0], [9., 0], [9., 4], [8., 4]], COLOUR(HSV, .5476190475, 1.000000000, .7000000000))

Can anyone explain the below printscreen in simple terms ?

It is taken from http://www.lgt.com/export/sites/inta_lgtcom/fr/institutionelle_kunden/kompetenzen/traditionelle_anlagen/lgt_and_science/aktuelle-projekte/quantitative-finance/Projekt_EfeAksueyek_en.pdf

on pages 24. Why do we have such a ratio (second formula) ?

Hi friends,
here is a paper from a book, which partiell diff equation I would like to solve with MathCAD or Mathematica or Maple. WHo can help? Thanks  a lot spending your time.  here is the PDF File with the paper

Is there a way to show posts in chronological order on Mapleprimes ?

.

 Hi
first : My English not good,so excuse me.
I have a problem with this:


1)C+Z*(C)*X=D where;

I know D , Z and X are matrix(n*n),(known)
but i can`t find C or Solve (1)finding C(matrix(n*n))

Help Me

Reza

In all versions prior to and including Maple 13 the Histogram default incorrectly displays the data.  Has this been fixed in 14?

eg.

a:=[1,2,3,4,5,6,7,8,9,8,9,7,6,5,4,2,2]

with(Statistics):
Histogram(a,frequencyscale=absolute,binwidth=1)

Clearly the...

I am taking up a research project that another student began last semester that utilizes Maple.  His program solved the problem correctly, but the program takes ages to do so. My Professor concluded that the other student erred because Excel can instantly handle the calculations while Maple can not.  Unfortunately, I've been looking at the code this other student wrote and cannot seem to figure out what went wrong.

I remember reading in the past that...