## Error, invalid input: diff expects 2 or more argum...

Please, anyone with usefull informations to hint me. Looking forward to your favorable response.

## how to instruct Maple to get sol. of eq. (y ∂x-x ∂...

Hello,

how could I force Maple to solve this pde

pdsolve(y*(diff(f(x, y, z, w), x))-x*(diff(f(x, y, z, w), y))+w*(diff(f(x, y, z, w), z))-z*(diff(f(x, y, z, w), w)) = 0)

When I hit enter, it happens nothing.

## how to collect value from a matrix like factor mat...

Matrix([[xx3[1,2],xx3[1,3]],[xx3[2,2],xx3[2,3]]])
Matrix(2, 2, {(1, 1) = (1/6)*sqrt(3)+(1/2)*I, (1, 2) = (1/6)*sqrt(3)-(1/2)*I, (2, 1) = (1/6)*sqrt(3)-(1/2)*I, (2, 2) = (1/6)*sqrt(3)+(1/2)*I})
expect output be
but these example are wrong
((1/6)*sqrt(3)+(1/2)*I)*Matrix([[1,-I].[-I,1]])
but these example are wrong
MatrixMatrixMultiply(Matrix([[(1/6)*sqrt(3),(1/2)],[(1/6)*sqrt(3),(1/2)]]),Matrix([[1,-I],[1,I]]));
concept like this output

## Evaluate expression at value...

How do you evaluate a function expression at given variable values?

`f := 2*sin(x)-x^2/10.00:`

`eval(f, x = 5)` gives `2*sin(5)-2.500000000`

`evalf(eval(f, x = 5))` gives `-4.417848549`

So is there a way we can just numerically calculate f(x) where x = 5?

## simplify command expresses results by unconvention...

Below is MAPLE code to simplify a series.  MAPLE expresses the result in terms of functions which many people are not familiar with.  Is there a way to express the answer in terms of more conventional functions expecially if N is a positive integer?

 (1)

## How can I specify curve of function...

How can I specify curve of function  when drawing set of functions in  one plot ,( curve1, curve2,...) in Legend

## fsolve interval resolution...

When attempting to numerically solve for a function using fsolv it is possible that the function has multiple roots.  So to focus on a particular region you specify a range such as:

xmax := fsolve(S, x = 0 .. 1/2)

Is it possible fsolve may not resolve the solution due to the fact that delta x is not small enough or does fsolve autonomously adjust delta x in order to find the solution?  If not, how do you manually dictate the delta x for the interval specified?

## How do I solve this system in Maple?...

Hello,

Could you please help me with the following problem? I'm new to Maple and I need some help.

Find the real solutions of the following system(it's a nonlinear system):

x^2 + y^2 + z^2 = 4

x + y + z = 0

x*sin(y*z) = -1

## Solution for integration...

Request help in solving the equation:

Eq_H_1 := C[11*m]*(int((t-(j-1)*T)*alpha*(-alpha*(K*T*beta+T*beta*j-K*T-T*beta-T*j-beta*t+T+t))^(-beta/(beta-1))*exp(-R[m]*t), t = (j-1)*T .. (K+j-1)*T))

Thanks

## How do i solve this problem in Maple?...

Hello,

Could you please help me with the following problem? I'm new to Maple and i need some help.

Solve the equation x^3 - a*x + 1 = 0 , in x. Determine the particular solution for a=1,2,... .Graphically represent the polynom that appears in the equation, in a case where the equation has a real root and in a case where the equation has 3 real roots.

Thank you !

## Complex solutions...

Hi

I d like to limit my solution to a real (non complex) solution
There should be a simple solution to my calculation but maple can t process the solutions in one of my "solve" commands.

How can do I tell maple to limit itself to one

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simple non complex solutions ?

## How do i sum over indexes [Solved]...

Hey mapleprimes

I am trying to get the sum function to give me n variables, well not sure how to explain it, so let me show:

`sum(x__i, i = 0 .. 2)`

I was expecting to get x__0 + x__1 + x__2

Thanks for the help in advance :)

Edit:

My problem is gone, but must be some weird character that is playing games with me or something

## nested loop not working...

Hi

I m trying to do a nested loop but for some reason maple tells me my for loop is unterminated

I d love some feedback on my code and on how to make it work

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Hi all,