I intend to calculate the eigenvalues and eigenvectors, but for the same matrix when i executed the Eigenvectors command in mapple twice the eigenvalues generated are same both the times but the values of eigenvector are infinite at one instance whereas they are in numeric domain in the second instance.

Can anyone please tell me why this is occuring?

Hi 

I am a Matlab user and just started using maple because I need more precision for my calculations. I failed to make Matlab interface work, therefore, I am writing my codes from the begining. And I am having a problem with a nested for loop.

The thing that I am trying to make is (in Matlab)

for j=1:N;
    for i=mod(j-1,2):2:j;
D(i+1,j+1)=2*j;
    end
end

In maple I tried something like

I have a matrix of order 14 with whose entries being variables about u_1 to u_12. I want to get its determinant, but it return no results. It explains that it is too big for maple to deal with. So I wonder how to deal with such kind of this problem?

Thank you very much for kind attention!

hi,

i have an exercise ,i have to do for sunday:

a program on maple 13 of o numerical solution of heat equation for  semi-infinite rod where a finite quantity of heat is injected into the left end in the form of pulse instant

please i need your help.

hello;

i want to rewrite the following matlab code to maple13

L=10*ones(2,m),L(1:2,1)=[90;90];

v(1:2,1:m)=[sum(L(:,1:m)),sum(L(:,1:m))];vv(1,1:m)=v(1;1:m);

this is a piece of program

I need some sugestions how to expand terms raised to some exponent within an expression. How to simplify,How to collect terms with some conmon factor within the same expression relativistic_11.mw

i need your kind sggestions for this. i wrote the function w:=(xi(t),eta(t),diff(xi(t),t),diff(eta(t),t))→value.

but i cannot get the output, it wrote error in argument name. here value means the expression of the function.

best regards

I   have  the function W(Xi(t),ete(t),diff(xi(t),t),diff(eta(t),t)), a function of 4 variales.

I want to have all possibles second order partial derivative of this function with respect those variables

Here is my sheet. non_linear_P2_last_q.mw

In this problem I have achieved every thing what I aimed, thnaks to the wonderful people here!!!

I am looking for a way to do it in a more structured way meaning the calculation of Jacobian in the attached sheet is somewhat manuel, though I wonder does maple has some other way?

Hi!

I am a mechanical engineer.

I want to differentiate a potential energy functional (a multivariable functional combination of integrals) in the variational calculus to get the Euler-Lagrange equations and boundary conditions and then to solve ODE's and PDE's to get a closed form solution.

The form of PE:=F(x1,x2,x3,w1(x1,x2,x3),w2(x1,x2,x3),w3(x1,x2,x3),diff(w1,x1),etc...)

Interested in getting diff(F,w1)  and diff(F,diff(w1,x1)).

 I want to evaluate the values of x and y and the data should bo saved in .xls format  from contour plot 

for g=0.1 the data x and y values  should be stored in xls sheet 1  atleast 50 values 

similarly  in separate xls sheet 

for g=0.0 the data x and y values  should be stored in xls sheet 1  atleast 50 values 

with(plots):
g:=y*(1-1/(x^2+y^2)):
colors:=table([0.1=blue,0.0=green,0.2=red]):
display(seq(contourplot(g,x=-1..1,y=0..2,
contours=[i],color=colors[i],axes=boxed,legend=(i)),i=[0.1,0.0,0.2]));

thanks in advance

Hi all,

I have the following functions.

restart:
with(IntegrationTools):
N:=4:

i:='i':
for i from 1 to N do
    assume(x[i-1]::constant):
    assume(x[i+1]::constant):
    assume(x[i-1]::constant):
    assume(h::constant):

 phi[i](t):=piecewise(t>=x[i-1] and x[i]>t, (t-x[i])/(h), x[i]

(x[i+1]-t)/(h), 0);

end do;

## my goal is solve the integrals involving phi[i]'s as integrand and x[i]'s as its limits.

How to give the different colors in implicit plot  and add legends my codes are 

with(plots):

g:=y*(1-1/(x^2+y^2)):

aa:=[g=0.1,g=0,g=0.5]:

implicitplot({seq(aa[i],i=1..3)},x=-5..5,y=0..2,legend="g=0.1,g=0,g=0.5",color=[red,blue,green],scaling=constrained);

i want to draw  a countour plot and i want the graph in the given below patter  and my codes are 

for Q=1, and Q=2 ,Q=3.2

F:= x^2+2*y^3+Q:
p1:=contourplot( F, x=0..1, Q=1,color=red):
p2:=contourplot( F, x=0..10, Q=2,color=blue):
display(p1,p2):

thanks in advance

i want to plot a streamlines for the functions 

psi=2y-exp(-x):

for different values of psi=0,1,2,3 and x=0 to 1 i want plot stream lines