## Textplot for family of curves...

Hi

I am trying to get a family of curves on one graph. Each curve a different colour and labeled

P=2, Q=0 , P=2,Q=1 , etc

mmcdara 's proposal for inspiration?

https://www.mapleprimes.com/questions/233088-How-Do-I-Plot-A-Function-Of-Two-Variables

Family_of_curves_plot.mw

## Re: how to preserve '1d' subscript as is . ...

Hello there,

When I tried to write an expression with the '1d' subscript, I found that it was automatically translated as '1.'. The following worksheet shows an example. Is there any chance to preserve the expression as I intended to see?

 > restart;
 (1)
 >

## Maple doesn't seem to compute correctly this expre...

I have just come across this curious but really boring problem.
In the code snippet below, expr1 and expr2 are identical.

```restart:
data := [a=1, b=2]:
convert(
piecewise(And(x(t) > a, x(t) < b), 1, 0),
Heaviside
):
expr1 := eval(eval(%, data),  x(t)=z):
plot(expr1, z=0..3);

convert(
piecewise(And(z > a, z< b), 1, 0),
Heaviside
):
expr2 := eval(%, data),:
plot(expr2, z=0..3);```

But if I change the parameterization of the problem, expr2 is still correct but expr1 is not

```restart:
data := [d=1.5, a=0.5]:
convert(
piecewise(And(x(t) > d-a, x(t) < d+a), 1, 0),
Heaviside
):
expr1 := eval(eval(%, data),  x(t)=z):
plot(expr1, z=0..3);

convert(
piecewise(And(z > d-a, z< d+a), 1, 0),
Heaviside
):
expr2 := eval(%, data),:
plot(expr2, z=0..3);
```

Where does this come from?

## Re: Two questions...

Hello there,

Would you allow me to ask these two questions?

1) is there any way to collect the expression 'eq14_2' w.r.t. DeltaP? The question is labeled as 'Q1' in the worksheet.

2) Why does the 'DeltaP' term survive at the RHS of the expression 'eq14_2_3'? In other words, is it possible to cancel out the same term, 'DeltaP', in numerator and denominator?

 > restart;
 > eq14_1_3 := w[NET] = Delta*T[Sfg];
 (1)
 > eq14_2 := w[NET] = -((v[2] + v[3])/2)((-DeltaP + P) - P) - ((v[1] + v[4])/2)((P - P) + DeltaP);
 (2)
 > simplify(eq14_2);
 (3)
 > collect(expand(eq14_2), DeltaP, distributed); # Q1
 (4)
 > Desired1 := w[NET] = DeltaP * (-v[2]*(-1)/2 - v[3]*(-1)/2 - v[1]*(1)/2 - v[4]*(1)/2);
 (5)
 > eq14_2_2 := rhs(eq14_1_3) = rhs(eq14_2);
 (6)
 > eq14_2_3 := eq14_2_2 / DeltaP; # Q2
 (7)
 > Desired2 := w[NET]/DeltaP =  (-v[2]*(-1)/2 - v[3]*(-1)/2 - v[1]*(1)/2 - v[4]*(1)/2);
 (8)
 >

## How can i define an initial solution of an ODE wit...

Thank you everyone!

I am trying to solve an ODE with nonlinear boundary conditions, it is a BVP. And the maple let me to specify an approximate initial solution. I just don't know how to define the initial solution. What format is the initial solution? I have tried the Help Document told me to, but I still can't figure it out. Please help me, thank you!

## How to get Black Hole temperature...

Hi.

Just trying to replicate a calculation, I would expect close to absolute zero, but my units are out

Black_hole_temp.mw

## How can complex transformations be used to tile th...

Initial text in the uploaded worksheet describes an attempt to partially tile the Poincare disk and asks to be shown how a known complex transformation can be used to accomplish this.

## What hyperbolic transformation performs this works...

The worksheet below contains the desired hyperbolic action and asks for the specific transformation that performs it.

Hyperbolic_Transformation.mw

I have corrected the above worksheet so that the Poincare disk is now centred at [0,0].

I hope this helps you answer my question

## How to convert Matlab codes to Maple code?...

Anyone can help me to convert matlab codes to maple, pls, this is my code p

## Plotting of a nonlinear differential equation?...

Plotting of a nonlinear differential equation?

## Signing in to Maple...

Every time I open Maple it has the invitation to Login in the top right-hand corner.  I would like to sign in but have had quite a bit of trouble doing that.  I have a user name and password with Maplesoft web store and the same for MaplePrimes.  Should either of these work to log in?

## Please fix my Explore plot...

Hi. I can't seem to get my Explore plot to work. Maple gives me a cryptic error message (IMHO).

Rectangle_within_circle_gen.mw

## Explore 2 plots simultaneously...

Rectangle_within_semicircle.mw

Hi..What I want should be self explanetary. Trying to Explore 2 plots on the one graph.

## How to find second solution of non-algebraic equat...

I want to solve the equation x^(1/x) =1.2
`solve(x^(1/x)=1.2)`

The output is 1.257734541376526421
How do i get the other solution, numerically.

Is it possible to restrict or stipulate the domain to look for roots over a specific interval, some rootfinding command over the real numbers.
I also tried `solve(x^(1/x)=1.2,AllSolutions,explicit)`
Wolfram immediately gives me the second solution. https://snipboard.io/Nqt74K.jpg https://snipboard.io/Nqt74K.jpg

Hi

I am trying to use Explore command to model the CSA  of a trough.

So I want to  be able to change the variables: length of the walls (l:, slider 0..20) and the width (w:slider 0..20) and the angle (theta: slider 0..Pi/2)

Want to be able to see the diagram change and also display the area using the formula [output (15)] on the graph

Here is my attempt.

trough.mw

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