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MaplePrimes Questions

Dirac and convolution...

Asked by: lemelinm 1535

November 04 2008

0 4

HI all,

I know that :

alias(delta=Dirac):

`δ*g` = int(delta(x)*g(t-x), x = 0 .. t) and int(delta(x)*g(t-x), x = 0 .. t) = g(t);

But look what happen. Can someone justify this behavior

Exponents and Square Roots...

Asked by: Adnan Zuberi 6

November 04 2008

0 0

The attached worksheet starts off with two quick videos that show you how to write square roots, fractions and exponents. Feel free to create and attach a worksheet with all of your questions and math expressions. I'll go thought it and help out !

maple won't carry on calculation...

Asked by: mjason 249

November 04 2008

0 4

I really need to be able to continue this calculation past nmax=14 but maple just won't do it.
I'd like to take it as far as possible. Does anyone know why maple won't calculate past nmax=14 and
if it can be overcome? Is this too difficult to achieve? I'm completely lost. can anybody help?

>restart;with(plots);
> with(LinearAlgebra);
> nmax:=14:
> Order:=nmax+1:

General Relativity Calculation...

Asked by: dcasimir 1212

November 04 2008

0 0

Can anyone help with a purely Maple solution to this problem? (i.e. not having to download anything extra.)

Just for reference I'm woking on problem number 26 in "Schaum's Outline Series " for tensor Calculus.

It gives you a Schwarzchild metric and asks you to calculate the Einstein Tensor. I'm using the example of doing this that's given in the "tensor" package help pages. However I'm not getting quite the right answer.

find a parametric function which we have its expan...

Asked by: ali701 28

November 04 2008

0 1

hello. I have calculated an integral equation (general goursat problem) with an iteration method. I want to know how could I use MAPLE to derive a function for. I found the first 4 iteration for function f. the exact problem is Uxy=2.U.Ux . U(x,y)=2x on y=x^2+x and U(x,y)=3x^2 on y=0. I want to find the U function. y=t^2+t U0=2t-3t^2+3x^2 Un=U0+int(2*Un*(Un

continue a numerical integration of a ode...

Asked by: Giandomenico Di Massa 48

November 03 2008

0 0

is possible to continue a numerical integration from a know point and add the solution the the know one?
i.e.
if I have:
P=dsolve(... range=0..1)
and I want continue the integration until 3 (so without reintegrate the 0..1 interval) and add that solution tothe first one.

Greatest Common Divisor - igcd...

Asked by: maplenoob 189

November 03 2008

0 8

i made an implementation of the euklid algo (rekusiv and iterativ) und meassured the time that was needed to calculate the gcd. even for big numbers really fast, but if i use the maple command igcd i get a runtime that is far longer then the time i get with my own implementation.

how does that come ? what algo does maple use the calculate the gcd ?

anyone knows?

thx for reply

_%{F2M2z........

Asked by: deby123 49

November 03 2008

0 3

#fM2{Sz{&fg{Z22
&{,_32zU{&Y2{r~_%_92{%u$z?TT+{_&
2%{92{f?{J{Y_%{%2yf`Y2z2%{3Y2{9_F@&yzf`3{ZYfyY{Y_%{3Y2{3z_F&9@3_3fSF{`zSy2%@z2o{J{3S,%{Y2z{3Y_3{J{Y_%on>f3YS@3{3Y2{
2tU{&fzU{2gy@&2{92{f?{J{l2,f2M2{3Y2{3YfFL{f9`S&&fl,2onjS{tS@{Zf&Y{92{3S{F_92{tS@z{
2tU{9_%_92)nJ?{tS@{`,2_&2onJ{3Y2F{3S,%{Y2z{3Y2{
2tbZSz%U{ZYfyY{l2,SFL&{3S{FS{,_FL@_L2U{_F%{J{&_Z{Y2z{&@z`zf&2o{kY2{3S,%{92{3Y_3{f3{Z_&{f9`S&&fl,2U{?Sz{&Y2{l2,f2M2%{Y2z&2,?{3Y2{SF,

simple yahtzee simulation...

Asked by: amycherven 56

November 03 2008

0 20

does anyone know how i would write a simple maple program that generated random numbers and simulated rolling 5 die that output the expected number of turns ( your initial roll then two more rolls with selected die) that it would take to get a yahtzee?

viewing/importing matrix/array data from maple...

Asked by: fenghedo 32

November 03 2008

0 4

Hi,

I am a beginning user and have no idea how one can view or import a table structure in maple. I used a procedure to compute some tables and it frustrates me that I don't know how to get them out efficiently.

The procedure is like the following:

get_quantities:=proc(j1,j2)

local x_min, x_max, y_min, y_max, x_seg,y_seg,idx_x,idx_y, q1;

option trace;

x_min:=j1-1.5;

x_max:=1.5;

y_min:=j2-1.5;

y_max:=1.5;

Max problem...

Asked by: SS7 16

November 03 2008

0 4

How could I find the max x value of the following plotted graph?

plot(diff(2*Pi*(x+1)*(ln(sqrt(x)+1)),x$4));

I've tried finding the max x value of this graph with

solve(diff(2*Pi*(x+1)*(ln(sqrt(x)+1)),x$5)=0);

but it failed to give me a numerical answer.

Thanks

Sam

Help with IVP ODEs...

Asked by: malt_master 100

November 02 2008

0 2

Hi,

I'm going nuts trying to get the commands(code) to solve the following two problems:

Problem 1 Verify that the given function is a solution of the initial value problem.

y:=x^2*(1+ln(x)); y'':=(3*x*y-4*y)/(x^2 y(e)=2e^2 y'(e)=5e

Solving for a Matrix X....

Asked by: richblair 44

November 02 2008

0 4

I'm trying to solve for the following matrix X such that

B=X^T.A.X...i.e. B equals X transposed times A times X. A and B are known. and are square matrices. I've been messing aroundwith Maple, and I know it can do this, I just can't figure it out. Thanks.

A=[2 3]

[1 4]

B=[1 0]

[0 1]

Minimal polynomial of algebraic number using maple...

Asked by: desp 145

November 02 2008

0 1

Hello everybody, I was wondering if one can find the minimal (or "irreducible") polynomial of a algebraic number. For example, x^3+6x+8 is irreducible. We do alias(theta = RootOf(x^3+6x+8) ); Then we are looking for the minimal polynomial of (theta^2)/2 for example.. How can we find this minimal polynomial? Is there a simple command in maple? Thanks in advance.