Download v1v2.mw

Hi All;

I have a maple code made a text file which is readable by another software. My code works as a worksheet but when I run it as a .mpl file does not work well. The text file created in this situation has a limited in the word typing (split a long line into two line by "\" ) . So the text file is not readable by next software (shows a syntax error).

example:

f6 = -2*u*(-u^2+ux-1)-2*ux*(-2*u*ux+uxx)-2*uy*(-2*u*uy+uxy)-uy+10001/10000*u+.438112544881510e-4

in 

f6 = -2*u*(-u^2+ux-1)-2*ux*(-2*u*ux+uxx)-2*uy*(-2*u*uy+uxy)-uy+10001/10000*u+.\
438112544881510e-4

I would appreciate for your help.

Baran

HI!, 

first time post.

I am reletivly new to maple and am having some problems getting maple to solve my differential equasions

basically my equasion is -

m*dv/dt=mg-R 

v(0)=0

m is mass at 100kg, g is gravity at 9.81m/s and R is air resistence (k*v) where v is a constant yet to be determined

the constant k needs to be that which would make the terminal velocty 5m/s 

this is all i have so far and im scratching my head:

de := 100*diff(v(t),x)=100*9.81-R;
                      de := 0 = 981.00 - R
Y :=rhs(dsolve({de,v(0)=0}, v(t)));
Error, (in dsolve) not a system with respect to the unknowns [v(t)]
 

what am i doing wrong?. 

Hello ,

I need your help , I have this loops and I  want to save data to a file , but the table save just the last one 

this is the code

thank you

for i from 1 by 1 to 3 do 
Q:=[]:
simplfloat:=rand(-1.0..1.0): 
a:=simplfloat():     
eq:=a+i:
Q:=[op(Q),[i,a,eq]]:
writedata("all.dat", Q):
end do;

exemple.mw

Below is a link to my worksheet.  I am attempting to evaluate a Fourier series for a particular number of terms & at a specific location xmax.  As far as I can tell xmax is assessed correctly.  Howver, when I go to evaluate the Fourier series for x = xmax using either the 'value' or 'evalf' command they do on seem to recognize that x = xmax.

So I am guessing I must have some syntax problem.  Can anyone show me what I have wrong?

command_syntax.mw

I'm having sone trouble with my matricies after running restart. When creating the matrice, everything is fine and they are defined as normal. But, if I run restart and try to erdefine them, they are defined as some form of 

The only way I've been able to fix this besides restarting Maple is to either add or remove the colon after the matrix, depending on wether there was one. If ther was, when I remove it the matrix is defined normally and vice versa. I'm relatively new to Maple coming from Matlab and would like to start using it more, but this matrix thing is very frustrating. I've attached a copy of the maple file. Thanks

First definition, everything is normal:

After restart, everything goes bad:

I want to animate a ball rolling on the surface cos(abs(x)+abs(y)).  The ball mass m is 1kg, radius r is 0.1meters starts at (0.5,0.5,cos(abs(5)+abs(5))) meters using g=9.8.  If we say the initial velocity of the ball is pushed in some random direction.  How do I show the path of the ball and animate?

Howto make all points start from [0,0] and goto [1,0] 
and make my loop not overwrite my initial conditions for the next steps?

M:=10; N:=1000;

for i to M do
X[i, 0] := 0;
Y[i, 0] := 0;
X[i, 1] := 1;
Y[i, 1] := 0;
for j to N do
Vinkel := c*rand()-Pi;
X[i, j] := X[i, j-1]+cos(Vinkel);
Y[i, j]:= Y[i, j-1]+sin(Vinkel)
end do:
end do :

Hi...  I use the "solve" command to solve an algebraic  system. Sometimes, the solution is given using some unknowns as parameters.

A toy example: x+y+z=1,x-y+3z=7 gives x=-2z+4,y=z-3 as a function of the parameter z (in the RHS).

Can I obtain directly (without going through the block-by-block solution) the set of parameters used in the given solution?

Thanks in advance.

Hello Maple users,
Help me to find all positive real solutions of the polynomial containing a small parameter "c" as:

(solution must be in term of c).

Hello,  after almost a decade not using Maple, I am trying to get going to solve a set of differential equations and I have some problems that are probably pretty basic.

1.  I have the following simplification equations

which rightfully gives

and

which I hoped would give

but gives

"Error, invalid left hand side in assignment".  What am I doing wrong?

2.  The above simplification equations will be used to simplify this vector:

Once I get passed the "Invalid left hand side assignm,ent" issue, I would like to reorganize each line of the above vector and simplify using the small equations above.  What command do I need to use to do this?  The Phi & Beta variables are not necessarily next to one another so the equations need to be reorganized and the substitution for Omega & Omega_dot done.

Any help is appreciated! Thanks

Dear friends,

Download 3Dplot_given_Data_xyz.mw

Hi everibody 

I work with Maple 2015 under OS-X El Capitan.

Using more than one matrix vector product (either M.V  or MatrixVectorMultiply(M,V)  ; M is a n by p matrix and V a column vector of size p) within the same block of commands generates an error.

Do other people have the same problem ?
Thanks for your feedback.

SomethingGoesWrong.mw


PS : I know I can do this   X . <<1, 1, -1> | <-1, 2, 0>> but this doesn't explain the error I get

Hi, there!

I try to simplify the next expression:

Simplify(LeviCivita[4, sigma, lambda, rho]*LeviCivita[4, xi, eta, mu]*g_[rho, mu]*qp[sigma]*q[lambda]*qp[xi]*q[eta])

Maple gives the answer:

In reality, it is the incorrect answer, because indices must run over 1,2,3 but not 1,2,3,4!

SumOverRepeatedIndices(%) confirms that maple mistakes.

my preamble is:

with(Physics)

Setup(mathematicalnotation = true);
Coordinates(X);

Setup(spaceindices = lowercaselatin)

Setup(tensors = q[mu](X))

PDEtools:-declare(q(X))

Setup(tensors = qp[mu](X))

PDEtools:-declare(qp(X))

I have many expressions in a worksheet like this:

latex(%, "equations.tex", append = true)

I should have defined a file name like this:

fname := "C:/home/MyStuff/Economics/MICRO NOTES/equations.tex"

And then replaced the first expression throughit the worksheet by:

latex(%, fname, append = true)

To acheive this I open the Find/Replace dialogue as in picture below:

This does not work. Instead of replacing with fname the result is "fname" .  Is there any way of doing what I want?