hi

i have an array for example f[i]  that consist of 100 element. i want to plot f[ x(i) ] in terms of x(i). i dont know how i plot in maple. before i print f[x(i)] and x(i) and by copy in excell worksheet i plot in excell. but i want to plot in maple.please help me.

thancks

hi

i write a code that solve system of ode. when i ask maple to show my answer its shows following statement:

 sol := dsolve({diff(G(x), x, x)+Le*f(x)*(diff(G(x), x))+(Nt/NB)*diff(T(x), x, x) = 0,diff(f(x), x, x, x)+f(x)*(diff(f(x), x, x))-(2*nn)/(nn+1)*(diff(f(x), x))^2 = 0,diff(T(x), x, x)/Pr+f(x)*(diff(T(x), x))+NB*(diff(T(x), x))*(diff(G(x), x))+Nt*(diff(T(x), x))^2=0,G(0) = 1, G(b) = 0, T(0) = 1, T(b) = 0, f(0) = 0, (D(f))(0) = 1, (D(f))(b) = 0}, numeric);

Hello,

I have an error in Maple 15, I dont understand why it doesnt work. I mention that in Maple 13 it works:

The code is

  L:=4:

sum(diff( (x^2-1)^l,x$l),l=0..L);

The error is:

Error, (in SumTools:-DefiniteSum:-ClosedForm) summand is singular in the interval of summation

Somebody can help me, please?

Thank you

How to expand a periodic function to form of fourier series

The periodic function such as

exp(lambda(exp(I*t)-1))

I have a program that makes very simple operations (such as concatenations or comparisons of binary strings) but it is intended to produce many data.

Maple seems to be in trouble when the number of data grows: whith my (quite old) computer, it begins to be very unefficient when trepassing a thershold  about 5*10⁴ items.

Are there some tricks I do not know?

subs.mw

Hi

How can i get maple to substitute z=x^2 into y=x^10-x^8 to produce y=z^5-z^4?

Hi:

Is it possible to programatically specify which variables are to be skipped and what the ranges should be for others when using the Explore command? I mean as options to Explore.

If not, is this in the future plans?

thanks,

I have 2 arrays of data that I have calculated ( X1 and Y1). I plot them and can see the min and the max points. I need these points. I use the command:

P:=ExtremePoints(X1, Y1);

And it gives me:

P:=ExtremePoints(X1, [4, 2,3,1,5,0.3,4]);

I expected that P will be an array and when I used the command:

N:=ArrayNumElems(P);

It will give me the total number of the min and max, but it gives me a mistake.

I will...

how to invert power series beginning with a square term?

I'm sorry if I'm duplicating the information here. I tried to post a comment but it doesn't seem to be appearing.

When I change = to := it does not work. Maple says

 Error, invalid input: MultiSeries:-series expects its 2nd argument, eqn, to be of type {name, name = algebraic}, but received 1.*I

I'm using the pdesolve function for a linear pde system of two equations in x and y, with indeterminate functions V(x,y), W(x,y). I'm trying to incorporate Neumann boundary conditions such as:
eval(V[x],x=0) =1;

but when I do so in the pdsolve function I get the error message that the bcs are nonlinear in V and W. Is there a different way that I should be declaring these bcs for use in pdsolve? Or should I in fact be trying to incorporate the bcs some other way?

Hello,

I have a huge expression involving psi and phi called A_1 which I paste below.  I am trying to integrate it using the residue theorem in the variable phi. I make a substitution in u as below for sin(k*phi)  and ask for the singularities of each operand at u. But when I get my final result it still has the variable u in it. If its evaluated the integral in u then it should not return u in the result. Evidently it’s done something...

I have a system of 3 ODEs in 3 variables x(t),y(t),z(t) to be solved numerically. I would like to set up events to halt integration as soon as one of the derivatives changes sign.

I've tried things like:

'events' = [ [ diff(x(t),t) >0, 'halt'] ] :

'events' = [ [ diff(x(t),t) = 0 .. 0.1, 'halt'] ] :

I might have tried something like increasing(x(t)) (how nice and intuitive), but if I understand correctly the help page on this, increasing(x(t)...

Hi,

I have been defining a function:

f1:=(m,r0,en)->evalf(Int(....),y=0..infinity)

for some reason when I call this function and pass it values say f1(0.1,2,3) Maple is unable to return me an answer, it just spits back the unevaluated inert integral with the values of the parameters inserted.

However, I know that Maple can do this integral if I just input :

Really enjoying Maple 12 in document mode, but am finding the results to be unreliable sometimes. It doesnt seem like I can attach the maple file here (which is annoying), but I often find that when, for example, solving for a variable, the results are not shown properly as an equation, but rather include text which looks as though maple is showing the equation with some kind of internal code, for example d ...