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I have
a:=-(diff(x(t), t))^2*h^2/(x(t)^2-2*d*x(t)+d^2+h^2)^(3/2);
                       

How do you collect the denominator to get

Hello. Is there a built-in function to determine the required sample size for different distributions in a population?

When I try to install (as an example) physics update using Maple 2018.2.1 on windows 10, it keeps hanging in the middle as shown above.

I closed Maple, starting again and tried again, same thing happens. I waited for more than 10 minutes and nothing happens.  I click on the install button in the clouds windows from Maple itself to install it as I always did.

Do others have problem installing this?  I'll try again in few hrs, it might be the Maple server is having some issues but thought to ask.

Hello,

given is the lower, partial differential equation. I have solved this (hopefully) correctly. I was given the tip to do in Maple a simple control in which the solution is inserted into the original equation. Since I'm quite inexperienced in maple, I would like to ask you for help on how I do that best!

Thanks a lot!

Basis equation:

Solution:

Could anyone explain why Maple doesn't calculate the Killing vectors for the metric below?

Thanks in advance!

killing2.mw

I try to solve ODE with conditions, but it give answer only without conditions:

SOT.mw

Thank you.

Hi, I'm trying to plot the following functions in 3 dimensions using the following:

plot3d(kappa*sech(kappa*(-k^2*t+x)), x = -10 .. 10, t = -10 .. 10)

plot3d((2*(-K^2+k^2))*(K*cosh(k*(-k^2*t+x))+k*cosh(K*(-K^2*t+x)))/((K+k)^2*cosh(k*(-k^2*t+x)-K*(-K^2*t+x))+(-K+k)^2*cosh(k*(-k^2*t+x)+K*(-K^2*t+x))+4*K*k), x = -10 .. 10, t = -10 .. 10)

plot3d(2*(diff(arctan(lambda*sin(mu*((-3*lambda^2+mu^2)*t+x))*sech(lambda*((-lambda^2+3*mu^2)*t+x))/mu), x)), x = -10 .. 10, t = -10 .. 10);

Each produces an empty plot with a message similar to the following:
Warning, expecting only range variables [x, t] in expression 2*(lambda*cos(mu*((-3*lambda^2+mu^2)*t+x))*sech(lambda*((-lambda^2+3*mu^2)*t+x))-lambda^2/mu*sin(mu*((-3*lambda^2+mu^2)*t+x))*sech(lambda*((-lambda^2+3*mu^2)*t+x))*tanh(lambda*((-lambda^2+3*mu^2)*t+x)))/(lambda^2/mu^2*sin(mu*((-3*lambda^2+mu^2)*t+x))^2*sech(lambda*((-lambda^2+3*mu^2)*t+x))^2+1) to be plotted but found names [lambda, mu]

in each case kappa, k, K, lambda, mu are real constants 

Thanks for any help with this
 

Is there any facility to apply Finite Volume Method to Partial idifferential equation on MAPLE?
Any comand?

Any Code?

I know abut semilogpot - it gives a semilog scale on the horizontal axis.

Is there any way to get semilog scale on the vertical axis?

Season's greeting

Modify the procedure that implements the secant and tangent routines in such a way that instead of the number of iterations in the beginning give the given accuracy E, with which the approximation is to be determined.

As a result, the procedure should return the last approximation along with the iteration number.

===

===

I need help.

How can we remove 0=0 from the above by single comand if it lie in any position from the set?

How to eliminate the I in the numerator?

Hello,

Suppose we have a set of quadratic equations of the form:

U_11 * a * q + U_12 * b * q + U_13 * c * q + U_14 * d * q + U_15 * a * w + U_16 * b * w + U_17 * c * w + U_18 * d * w + .. = C_i

.

.

.

Where terms in uppercase means constant while lowercase letters correspond to unknowns.

Now, I want to make a change of variable, so instead of having non-linear term `a * q` we would have `s_ij`, meaning i-th equation and j-th unknown after the change was done.

I'm trying to do so, because in my case I will be left with a linear system with a small number of unknowns(relative to N) and N equations, and so I could then solve it easily.

Any help is appreciated, thank you!