## How do I solve a system of equations in maple?...

Hi

How can i solve this system of equations:

N and P are variables and the others are constant numbers.

I used "solve" function but the results are:

piecewise(And(1 < c, 1 < d, 1 < k, 0 < -RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z)*d/((d-1)*c), 0 < -RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z)), [{N = d*k*(exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1)/(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1), p = c*k*(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-d-exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))+1)/(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1)}], [])

## Warning, Run: unable to set assignto result due to...

During running my ws I faced with memory error as below, where as my system have enough memory (120GB)

Warning, Run: unable to set assignto result due to error:  Maple was unable to allocate enough memory to complete this computation.  Please see ?alloc

Maple's help suggests :Software limits are imposed by the -T command-line argument, the datalimit argument to kernelopts and system imposed user limits (for example shell limits).
But I could not understand how to increase software limit.

how to fix that?

## I unprotect the GAMMA, but still receives error, w...

I unprotect the GAMMA, but still receives error:

Error, attempting to assign to `GAMMA` which is protected.  Try declaring `local GAMMA`; see ?protect for details.

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What is the problem?

## How to perform numerical integration with set of v...

Dear all,

Greeting!

I am a new user of Maple. I want to perform a simple (to me, it is very difficult) integration  defined as follows

range from 0 to omega (frequency). alpha^2F (omega) is constant function with set of values (already calculated) for the corresponding frequency. I have calculated the frequencies ranging from 54 to 900 cm-1. Suppose I have alpha^2F(omega)=0, 0.5,0.6,0.7......0.1 for omega=58, 80, 110, 190,.....800, how can I perform this integration  in Maple? Please help me how can I cope with this problem.

Thanks a lot.

Best Regards,

## What is the mathematical description of a velodrom...

I would like to animate the motion of a bicycle racer on a classic velodrome track i.e. one with varied vertical and horizontal curvatures along its length.

Is there a source which explains the math expressions which model the shape of such a track?

## how to pointplot in 3d...

Hi

I have the values of of a function A(x,y,z) in 3d cartesian coordinates as [x[1],y[1],z[1],A(x[1],y[1],z[1])], [x[2],y[2],z[2],A(x[2],y[2],z[2])], [x[i],y[i],z[i],A(x[i],y[i],z[i])],etc...where i vary from 1 to 300 (or higher).

How to plot A(x[i],y[i],z[i]) in 3d.

Thanks

## How to plot Variation of the Volume fraction acros...

How can I plot functions Vc=(0.5+t)^n

with t=z/h,

## How do I solve a differential equation with recurs...

Hi there,

I have difficulties in solving the first partial derivatives dw/db and dw/dvarphi of this equation with its constraint:

w := exp(exp(x*b)*(r-1)/(1+varphi*exp(x*b))) where ln(r) = varphi*(exp(x*b))(r-1)/(1+varphi*exp(x*b))-1

Regards,

Sarni Berliana

## Can someone explain what DESol mean as a solution ...

Hello,

I am fairly new to using the Maple software, so I apologize if my question is completely idiotic. Apologies, also, because I could not manage to enter my code as code. When I pressed the button it made the whole text as a code.

I run the following code to seek -if there are any- analytic solutions for the following differential equation.

odeplus := (r^2+L^2)^(5/2)*(diff(f(r), `\$`(r, 2)))+((15/4)*r*(r^2+L^2)^(1/2)+3*(r^2+L^2)^(5/2)/r)*(diff(f(r), r))+M^2*f(r)/(r^2+L^2)^(5/2)-((5/2)*((r^2+L^2)^(1/2))(l-1)+(55/64)*r^2/(r^2+L^2)^(3/2)+(r^2+L^2)^(5/2)*(l^2+3*l+3/2)/r^2)*f(r)+(((r^2+L^2)^(1/2))(5+(5/2)*l)+(5/8)*r^2/(r^2+L^2)^(3/2)-(r^2+L^2)^(5/2)*(3/2+l)/r^2)*f(r) = 0

and then I do

dsolve(odeplus, f(r))

The solutions that Maple returns is given in terms of DESol. Could anyone try and break it down for me? What is this telling me and if I can indeed from the output obtain analytic solutions? Is this some sort of operator acting on something?

## Can this sequence be displayed unevaluated?...

`~`[int](convert(convert(series(x^x, x), polynom), list), x = 0 .. 1)

Can this sequence (produced above in list form) be displayed as 1, -1/2^2, 1/3^3, -1/4^4, 1/5^5 -1/6^6 etc.

That is with the powers unevaluated.

## Which differentiation rules apply to this derivati...

Please describe the step-by-step application of the rules of differentiation which produce this derivative:

diff(a(x)^b(x), x) =

a(x)^b(x)*((diff(b(x), x))*ln(a(x))+b(x)*(diff(a(x), x))/a(x));

## Where is there a full explanation of specfunc?...

Below are five subsindets commands.

I believe I understand the actions of B and C, but I fail to understand the actions, individually and taken together, of  E, F and G.

B := subsindets(u(i, j)^2*v(i, j)+u(i-1, j), 'specfunc(u)', proc (f) options operator, arrow; subsop(1 = op(1, f)+1, f) end proc);

C := subsindets(u(i, j)^2*v(i, j)+u(i-1, j), 'specfunc(anything, u)', proc (f) options operator, arrow; subsop(1 = op(1, f)+1, f) end proc);

E := subsindets(u(i, j)^2*v(i, j)+u(i-1, j), 'specfunc(symbol, u)', proc (f) options operator, arrow; subsop(1 = op(1, f)+1, f) end proc);

F := subsindets(u(i, j)^2*v(i, j)+u(i-1, j), 'specfunc(`+`, u)', proc (f) options operator, arrow; subsop(1 = op(1, f)+1, f) end proc);

G := subsindets(u(i, j)^2*v(i, j)+u(i-1, j), 'specfunc({`+`, symbol}, u)', proc (f) options operator, arrow; subsop(1 = op(1, f)+1, f) end proc);

Where can I find a thorough explanation of specfunc with examples?

## What am I misunderstanding in calculating this cub...

I have learned that the eigenvectors of an solid object's Inertial Tensor are its principal axes and are an orthonormal set, however two of the eigenvectors in the cube in the uploaded worksheet are not orthogonal.

Where is my error?

CubePrincipalAxes.mw

## plot a fourier transform...

I have defined a function, F, as

`F:=(s)->fouriersin(f(r), r, s)`

I would now like to plot that function.

`plot(F(s), s=0..3)`

How can I do that? Calls to plot don't work, as the "s" in the fouriersin definition of the function get replaced by the value I'm trying to plot.

## How to do a Fourier Transform on a function define...

Hi,

WARNING: This is a pretty silly question. I know it, but I've been on this for hours already...
I have this function rather simple but which depends on a natural number n. When I try a Fourier transform on it, it cannot evaluate the result for any n.

I have to define another function, and evaluate n=2, in order to get an explicit result.

```h := piecewise(abs(t) < 2*Pi*n, cos(t), 0)
piecewise(abs(t) < 2*Pi*n, cos(t), 0)
F.T.
---------->         fourier(piecewise(abs(t) < 2*Pi*n, cos(t), 0), t, w)         # doesn't work for any n

h2 := eval(h, n = 2)
piecewise(abs(t) < 4*Pi, cos(t), 0)

F.T.               2 w sin(4 Pi w)
---------->          ------------------                                          # works with fixed n=2
(w - 1) (w + 1)
```

How can I have an explicit result for any natural n ?