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Hi! I am a newbie in Maple. For several days trying to read help but no luck. Search here for "solve tensor equation" does not help either.

There are tensor package and physics package but in both helps i have not found how to solve simple tensor equation A_ijmnB^_mnkl=C_ij^kl. Let's say A and C i create as analytical arrays and then create tensors on the base of them (not Arrays - for some reason the tensor cannot be created on the base of Arrow...

Hello,

I would like to plot z(x(t)) with the odeplot function.

For the moment, i manage to plot x(t) and z(t).

But i don't manage to plot z(x(t)) ?

My last code lign is wrong.

Can you help me for this plotting ?

Thanks a lot

Here my code :

M:=1;                               

1l:=1;

g:=9.81; 

sys:=diff(z(t),t,t)=-1/z(t)*diff(x(t),t)^2-1/z(t)*diff(z(t),t)^2-x(t)/z(t)*diff(x(t),t,t),M*(-l^2/(x(t)*z(t)))*diff(x(t),t,t)=M*g-M*(-1/z(t)*diff(x(t),t)^2-1/z(t)*diff(z(t),t)^2);  

Cinit:=D(x)(0)=0,x(0)=0.99999999,D(z)(0)=0,z(0)=sqrt(l^2-0.99999999^2); D(x)(0) = 0, x(0) = 0.99999999, D(z)(0) = 0, z(0) = 0.0001414213562

sol:=dsolve({sys,Cinit},numeric);

tx:=odeplot(sol,[t,x(t)],0..10,numpoints=200,color=blue,legend="x"):display(tx);

 tz:=odeplot(sol,[t,z(t)],0..10,numpoints=200,color=blue,legend="z"):display(tz); 

txz:=odeplot(sol,[x(t),z(x(t))],0..10,numpoints=200,color=blue,legend="z"):display(tz);(x)

Good afternoon sir,

I request you to support me with regard to the above cited subject.

I would like to solve the a sytem of 5 differential equations for a combution process and i dont know how to do.

my enties are as follows

with(plots);
PDEtools[declare](prime = t);
print(`output redirected...`); # input placeholder
derivatives with respect to t of functions of one variable will

   now be displayed with '
MW = 29;
print(`output redirected...`); # input placeholder
   ...

@Carl Love

This is the integral

I do it by hand the result is Pi, but I do it with maple VectorCalculus it is zero,

how to do it fairly? please demonstrate.thanks!

Is there a way to remove the small dashed box that shows up while one is typing in document mode?
Also, is there a way to remove italic style from everything? I do not like italic at all. I tried many things, such as

Format > Styles. Select the 2D Input character style and click modify

but when I start new line, it goes back to italic.

I can also open the style sheet file (my_styles.mw) that I use, and look at the XML there. What do I need to change...

Hi folks, I'm running Maple 17.02 and getting very different behaviors from subs and isolate. My actual expressions are way more complicated but this simple example illustrates the problem:

restart; with(PDEtools); F := diff_table(f(x, y, w, z, a, b));

subs(F[x] = Z(x, y, w, z, a, b), F[x]+F[x, b]-10);

subs(F[x] = Z(x, y, w, z, a, b), F[x]+F[x, y]-10);

The last line gives me what I want  Z+Z[y]-10 but the second line gives me Z+F[x,b]-10....

I keep getting this error and have no idea how to fix it.

Error, (in Elements:-Maplet) `Elements:-ElementTable[typ]` does not evaluate to a module

This is my code for the section with the error. Any help would be greatly appreciated.

FindParamTan:=Maplet(onstartup = RunWindow(MAIN),
Window[MAIN](title="Computing Vertical and Horizontal Tangents to Parametric Curves",
[ [ halign=none,
    Button("New Curve", Evaluate(function = "ask"), background=magenta),

An elementary example of successful using Threads:

Hi,

tmp:=seq([phi[5-j]*(1-p[6-j]),phi[5-j]*p[6-j]],j=1..4);
Vector(8,[seq(op(tmp[i]),i=1..4)]);

"tmp" is basically what I want. Some kind of 'paired' terms, indexed in reverse order.

I wonder if there is a better (perhaps more efficient and "direct") way to do it?

Thanks,

casper

Hi all

 
i am solving a system of four coupled differential equations using bvp[midrich]approach..

The code i am using is in the attach files 

command is like

> A1 := dsolve({bc, eq1, eq2, eq3, eq4}, numeric, output = array([seq(0+0.5e-2*i, i = 0 .. 200*bb)]), method = bvp[midrich]);

with(plots)

 I have a system of 4 rational equations involving 6 variables. I want to solve this system for 4 variables. 

Whenver I try to do this I get either an error message about solutions being lost, or maple being unable to allocate enough memory.

The Commands involved are here: