## Plotting functions with units...

Hi there

I'm an old user of Maple, but I've never been able to plot functions with unit. You can see my latest attempt down below

```b := 120*Unit('mm');
h := 200*Unit('mm');
V := 8*Unit('kN');

I__x := (1/12)*b*h^3

Q(x):=(1/2)*((1/4)*h^2-(100*Unit('mm')-x)^2)*b
tau(x):=V*Q(x)/(I__x*b)

plot(Q(x(Unit('mm')), units), x = 0*Unit('mm') .. 100*Unit('mm'))
```

Plot_function_with_units.mw

If anyone is able to help me with this problem, I would greatly appreciate it.

## Maple 18: laplace in annular domain...

Hi

I solve the laplace equation written in polar coordinates in annular domain.
The code run without any error

But there is no solution displayed after running the code, note that I use Maple 18

Laplace_annulardomain.mw

## Assign for loop - Matrix change into Table in for ...

I want to divide each row of Marix A by diagonal element. In for loop, when I assign dividing results to the letter , the type of A still remains matrix, but if I choose another letter (like B) results are stored in Table. Why? How can I assign to a matrix?

Also I can't figure out why maple doesn't show elements of table(see worksheet file).

I should notice that my main problem is assigning not dividing.

worksheet.mw

## Can not generate Matlab code...

Hi everyone;

I want to generate the Matlab code from the Maple code but I obtained an error message as shown below. Can anyone tell me please what does this error message mean?

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Thank you ^^

## How to write codes using maple to stimulate all de...

i want to design a packaging container to hold 320 sphere-shaped chocolates that each has a diameter 1.8 cm and weights about 3.2g each. i hope can get all posible shape using maple18 .

## Can not calculate a defined integral ...

Good morning everyone,

I have a problem, when I try to evaluate the definite integral below, Maple can not provide a result. What can I do so that the Maple can calculate this integral?

This is the Maple code with the result:

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Thank you !

## Why the temperature is so high when start Maple 20...

If I have checked the Editable button just below the working window, then the temperature would be very high in the next time when I start Maple 2019. I do not what is going on. But when I unchecked the Editable button, and wait for several seconds, then the temperature and the load of my laptop are on the normal state.  Is this a bug for Maple 2019? My OS is Debian Stretch, that is,

\$ uname -a
Linux debian 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1 (2019-04-12) x86_64 GNU/Linux

## Laplace equation pdsolve...

Hi

I try to solve the laplace equation with some special boundary conditions.

But, i get the follwoing error

Error, (in pdsolve/sys) the given system is not polynomial in the variables {f}

Thank you for any help

## Is this modification correct?...

This worksheet is a modification to Kitonum's excellent http://www.mapleprimes.com/posts/202222-Contour-Curves-With-Labels.

The mod adds the ability to display labelled contours for expressions in x and y defined parametrically.

Contourplot_with_labels.mw

## writing an iterative loop using 'while'...

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Hi,
Essentially i am trying to programe an iterative loop where v(K+1) can be found fro v(K), I'm not sure how to programe a loop but I know this is not a hard thing to do so I am struggling, any help would be appreciated! Thanks.
Edit: Also alpha K must be found at each stage by optimising f(v(k+1))

## Warning, solutions may have been lost....

Hello everyone!

I'm having some problem with this equation:

solve(0.1 = 23.714*(-0.93205)^2/(20.3+61.4*.884^x), x)

I'm trying to solve for x, but i keeps saying "Warning, solutions may have been lost."

Any ideas?

## minimum period ...

Hello,

What is the minimum period of the following equation.

 (1)

## How to prevent immediate evaluation of trig functi...

When typing

```z:=exp(I*2*Pi/3);
convert(z,'sincos')```

Maple evaluates the intermediate result which is cos(2*Pi/3)+I*sin(2*Pi/3) and  gives

Is there a way to tell it not to do this? I'd like to see the result as when typing

```'cos(2*Pi/3)+I*sin(2*Pi/3)'
```

Is there an option or method to tell Maple not to immediate evaluation in the above? it can do evaluate next time the expression is used.

## How do I solve a differential equation in Maple?...

How to solve a system of partial equations with boundary conditions.I used this formula

restart;
sys_Pde := diff(V(x, t), x, x) = 0, diff(T(x, t), x, x) = 0;

BC := eval(diff(V(x, t), x), x = 1) = 0, eval(V(x, t), x = 0) = 1+cos(w*t), eval(T(x, t), x = 0) = 0, eval(T(x, t), x = 1) = 1;
pdsolve({sys_Pde});
{T(x, t) = _F1(t) x + _F2(t), V(x, t) = _F3(t) x + _F4(t)}
pdsolve({BC, sys_Pde});

Error, (in PDEtools:-ToJet) found functions to be rewritten in jet notation, {V(1, t)}, having different dependency than the indicated in [V(x, t)]

## Solve system for unknown function...

I

have the following function phi(x,y) which depends on two unknown functions F1 and F2 which are differentiable.

Phi(x,y)=y sin(x y) + F1(y) + y^2 F2(x y)

Note that F1 and F2 are obtained by hand when I solve a partial differential equation

I would like to find  phi(x,y)  that satisfies phi=1 and diff(phi(x,y),y)=1-x^2*cos(x^2) on line y=x

constraint.mw