Maple 13 Questions and Posts

These are Posts and Questions associated with the product, Maple 13

Hi! sorry me for my bad english =(

Can you help me with such problem? -

I need to solve a partial differential equation with 3 independent variables.

i see such answer - that maple doesn't solve such type of equations and i am very sorry about it =(

why matlab solve them and maple doesn't solve? the problem isn't hard - just give numeric solution, before i think much better about maple, and now i see that maple is rather limited program.  T_T

Problem of integer optimization

35*x+40*y+50*z -> min

.4*x+.5*y+.8*z >= 2

x,y,z are positive integers

 

When i call

> LPSolve(35*x+40*y+50*z, {x >= 0, y >= 0, z >= 0, .4*x+.5*y+.8*z >= 2}, assume = integer);
                        [135, [x = 1, y = 0, z = 2]] -- right solution



Hello,

I have some problems with pointplot3d command. This text worked in Maple 12 but it doesn't work now...

I have got this "Error, (in plots/tolist) points are not in the correct format".

My text:

restart:
with(plots):
with(student):
file := fopen(`C:\\Users\\Kate\\Documents\\ChSU\\New Project Mobile\\Inverted-L antenna\\ILA 900 MHz Analysis\\ILA 900 MHz.txt`,READ):
Data := readdata(file,7):
Data :=convert(Data,array):
N := 30603/3:

I want to determine the domain of definition for an expression using a command,

but i can't find it in the help,

can someone help me,

thanks in advance.

Eq[1] := .1*(diff(r(rho), rho))^5*r(rho)^4*sin(theta(rho))+(diff(r(rho), rho))^3*cos(theta(rho))^2*sin(theta(rho))*(r(rho)^4-.1*rho^4)+(diff(r(rho), rho))*rho^4*cos(theta(rho))^4*sin(theta(rho))+(r(rho)^2*rho^2*(diff(r(rho), rho))^4*cos(theta(rho))-rho^4*cos(theta(rho))^5+.1*r(rho)^4*(diff(r(rho), rho))^4-.1*r(rho)^2*rho^2*cos(theta(rho))^5)*(diff(theta(rho), rho))*r(rho)

 

Eq[2] := p*(diff(r(rho), rho))*cos(theta(rho))^3*rho-(diff(r(rho), rho))^4*r(rho...

Hello, 

I'd like to modify the form of this expression

Code:
den := 1.*omega^4/omega[n]^4+1.-2.*omega^2/omega[n]^2+4.*epsilon^2*omega^2/omega[n]^2



To manage to have this form.

Consider the following simple calculation with Ore algebras:

DA:=Ore_algebra[skew_algebra](euler=[theta,z]):
Ore_algebra[skew_power](sqrt(3)*theta,2,DA);
Error, (in Ore_algebra:-skew_power) skew polynomial must be member of the algebra

The error is due to the square root which is not recognized as a member of the algebra even though it is only a number. There seems to be no option to remedy this issue. Is there another solution ?

Hi,

I have a large expression of 10 variables that contains many rational terms. I would like to manipulate it from the form a^2*b^2*c^(-2)*d into for example ((a*b)/c)^2*d. And I want to do this for all terms and combine all variables of power 2.

I know how to do this for arbitrary power a^n/b^n to (a/b)^n but since I have n=2 maple automatically writes (a/b)^2=a^2/b^2 which is what I don't want.

Many thanks 

I get the following error message when trying to use LinearSolve(with inplace option) to solve a linear system of size 2000x2000 with 416 digits.

 

maple: fatal error, lost connection to kernel

 

Any suggestion to the cause of this error or how to avoid it?

Hi,

I want to plot a function with a restricted domain, specifically f(x) = |x| if -Pi <= x < Pi.

I want to first define the function, then use it in the plot command.

I know to define the function f(x) = |x|, I do

f := x -> |x|

...but how do I tell Maple to include the domain, -Pi <= x < Pi?

Thank you.

I right click my units and it does not give units to simplify

hi all,

swapping variables in the export line of a module changes its behavior.

First Example (works fine):

restart;
mp:= module() option package;
export mult, f2;
mult:=proc(v) return(3*v) end proc;
f2 :=proc(v) mult(v); end proc;
end module;

savelibname:="E:\\tmp";
savelib('mp');

restart;
libname := libname, "E:\\tmp";

with(mp);
mp:-f2(5);
mp:-mult(4);

# Output: [f2,mult], 15, 12

Hi all.

I was trying to perform a simple integration and convert the answer to a inverse hyperbolic function as follows:

int(9/sqrt(81*x^2-4),x);

simplify(%);

convert(%,arctrigh);

But the command convert fails to do the conversion. I should obtain arcosh(9/2*x)+c.   But the answer is in terms of the natural logarithm: ln(9*x+sqrt(81*x^2-4))

How do I manipulate the answer so that I can get the inverse hyperbolic answer?

Hi,

I'd like to display a UNsimplified mathematical expression in a Mathcontainer component using a Button component. In Maple Help under Mathcontainer, it is writing that we can display a unsimplified expression using the value attribut. For example:

Do(%Mathcontainer0(value) = a^2*b/a);

should display the unsimplified expression in the Mathcontainer0 component. And

 Do(%Mathcontainer0(expression) = a^2*b/a);

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