## Plot a line of constant y in 3d?...

Asked by:

I am trying to plot what seems like a simple particle trajectory along the y-axis. How would I plot a function that is just moving in a constant line along the y-axis in 3d?

## Need to simplify the expression ...

Asked by:

Dear all!

Hope everyone is fine with everything! I want to simplify the following expression

diff(u(y, t), t) = (A^2/nu)^(1/3)*nu*(diff(u(y, t), y, y))/(A/nu^2)^(2/3)-(A^2/nu)^(1/3)*sigma*B^2*u(y, t)/rho+(A^2/nu)^(1/3)*g*beta*q2[w]*sqrt(nu^2/A)*T(y, t)/((nu*A)^(1/3)*k)+(A^2/nu)^(1/3)*g*beta*T[infinity]/(nu*A)^(1/3)-(A^2/nu)^(1/3)*g*beta*V[infinity]/(nu*A)^(1/3)+(A^2/nu)^(1/3)*g*beta1*C(y, t)/(nu*A)^(1/3)-(A^2/nu)^(1/3)*g*beta1*C[infinity]/(nu*A)^(1/3)

I above the red terms need to simplify i.e., we can add the power of A, nu etc. But maple can't do that please fix my problem. For more detail I attach my maple file.

simplify.mw

## Plotting an arbitrary Matrix ...

Asked by:

I am trying to plot matrix in maple, and from the help i believe i need to use matrix plot.

I am trying to do something like;

matrixplot(Matrix(2,2,{x^2,y^2,x*y,y},[x,y]);

for example. Is there a way to do this? Just like plotting a graph without specifying the range of x and y.

thanks

## Solve/fsolve won't work...

Asked by:

In the uploaded worksheet, using "solve" takes too long to evaluate and won't answer, while "fsolve" will only simply rewrite the equation. What am I missing?
1-parasitic.mw

## Problem to find integration...

Asked by:

Dearz!!!

Hope you all are fine. I am stuck to find the integration in the attachment. Please see that put your valuable suggestion to fix my problem. Thanks in advance

## Transform derivative into new set of variables...

Asked by:

Dear all!

Hope everything going fine. I want to transfrom the derivative diff(u, y) into diff(U, Y) as disscussed in attached file. Please see the attachment and fix the problem. Thanks in advance

Transform.mw

## How to find a specific point on a 3d plot...

Asked by:

This may be a very elementary question, but my searches on the topic have been unsuccessful, so I have to ask here. I've plotted a function using plot3d, and I want to find the exact value of the two variables for which the function equals a certain value. How can I find this point on the plot in the easiest way?
As an example, I have

And I want to find the points for which abs(zIT)-50=0. zIT is a function of L & C defined previously.

## Example using the product command...

Asked by:

How can i find the smallest n such that

using maple 2015?

I've tried using the solve command however this doesnt return a numerical value, any help would be great :)

## Regularize and evaluate an integral...

Asked by:

Is there a way in Maple to evaluate the following integral - where the "w" are set to go to zero to avoid singularities? B.t.w. Maple just returns the integral unevaluated with or without the "w" with the simple "int" command.

`int(ln(((p1-p3)^2+w^2)/(p1+p3)^(w^2+2))*ln(((p1-p4)^2+w^2)/((p1+p4)^2+w^2))*sin(p1)/(p1*p3*p4), p1 = 0 .. infinity);`

or even

`int(ln(((p1-p3)^2+w^2)/(p1+p3)^(w^2+2))*ln(((p1-p4)^2+w^2)/((p1+p4)^2+w^2))*sin(p1)/(p1*p3*p4), p1 = 0 .. 100, numeric);`

## Discrepancy on output of square root...

Asked by:

Not sure what is going on, but I confirmed the result is incorrect via MATLAB.  Can anyone tell me what MAPLE is doing?  Evaluation of the 1st expression is correct, but the 2nd expression = 0 is incorrect.  The correct answer should be 1.862645149230957e-08.

discrepancy.mw

## evalf/Sum and epsilon...

Asked by:

This remains unevaluated:

`(evalf@Sum)((1-10^(-3))^k/k, k = 1 .. infinity)`

This might (or might not) be related to the fact that evalf/Sum doesn't have a tolerance (epsilon) setting. If I want to evaluate the sum with 1-10^-20 instead of 1-10^-3 directly, I need to increase Digits. But then the tolerance setting will increase too to about 10^(-Digits+1), and evalf/Sum will return unevaluated again because it won't be able to attain the requested accuracy. Whereas often only a few digits are needed -- e.g., to see how the sum grows with n -- and a tolerance value of 10^-3 or so would be sufficient.

## How I can plot function y versus A?...

Asked by:

How I can plot function y versus A?

In attached code amount A is selected one (A=1)

How I can plot (y-A)?

thanks

 (1)

 (2)

 (3)

 > dsys3 := { eq1, eq2, eq3,            x(0) = 10,            y(0) = 10,            z(0) = 10                       }: dsol5 := dsolve(dsys3, numeric, stiff = true, maxfun = 10^7); plots:-odeplot(dsol5, [t, y(t)], 0 .. 1)
 >

Download shiv.mw

## foldl for sequence ...

Asked by:

Hello, i have been trying to use the foldl function as a means of generating data as i do by iterating the seq call in the worksheet attached, but it has not been as straight forward as i thought. Im certain at least someone here already does this for the same reason, so if you know the code, sharing would be much appreciated.

 >
 >
 >

Download ASK_FOR_HELP_AGAIN.mw

## equation value display format ...

Asked by:

the final value of an equation is displayed in the form of combination of many values like following

-503.3433660*1[3]^2-2068.935708*1[4]^2-591.1244880*1[4]*1[1]-443.3433660*1[1]^2

I prefer to display it identically just an absolute value like 5.66

please help me how do that

## How do we reverse the order of these two factors i...

Asked by:

Assume that f:=(s+2)^2*(s-3). How do we get the order of the two factors reversed?
In other words, how do we get g:=(s-3)*(s+2)^2 by manipulating f? As usually,
I don't have f fixed. It is a product of two algebraic factors generated within the Maple program.
Thank you!

mapleatha

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