## Parentheses around y'(t) in Maple?...

Is there a way to remove the parentheses around y'(t)?

Thank you!

mapleatha

## Using a local variable breaks uneval...

```proc() local a := 0, b := 1;
print(proc(x::uneval) x := 1 end proc(a));
print(proc(x::uneval) x := b end proc(a))
end proc();
1
Error, (in unknown) illegal use of a formal parameter```

Why doesn't the second nested procedure keep a unevaluated?

## Typesetting of composition...

With Typesetting level set to Maple Standard, x->(f@g)(x) is displayed as x->f@g(x), which is wrong because composition has lower precedence than function application.

## sum of (-1)^k/k^(1/2) gives an error...

```sum((-1)^k/k^(1/2), k = 2 .. infinity);
Error, (in polylog) numeric exception: division by zero
```

## filter data in maple 18...

how can filter data im maple 18 befor used in draw plot? i need simple example

## properties axes of plot...

this is plot of f(x)=x(by used maple18) ,how can me change (2.5-, 1.5- ,0.5-) in x-axis to true?

## Eigenvalues for basic reproduction number ...

Anybody know how to compute coding for eigenvalues for basic reproduction number using the next generation matrix?

I dont know how to compute coding for eigenvalues.

Coding_Basic_Reproduction_Number.mw

## division of the center term of an expression ...

Hello people in mapleprimes,

I have a question.
I want to modify

a := rho^(epsilon-1)*a__01^(-k)*(N__E2/Omega+N__E1*mu)*(K+1)/mu;
to
b:=rho^(epsilon-1)*a__01^(-k)*(N__E2/(Omega*mu)+N__E1)*(K+1);

But, I can't do that modification.

The key term is
c:=N__E2/Omega+N__E1*mu;

I know how to use applyop, but even if I use it, I couldn't obtain b.

Nov_22_2017_1_mapleprimes.mw

## Conditions for inequalities and Visualizing equati...

Hello everyone!

Total beginner here. So far I am just using the right click options in Maple,  and worked wonderfully until now.

Two questions for some charitable sould out there:

1) I have a system of inequalities that I need to solve. I am interested in the *conditions between the variables under which a given inequality is satisfied*.

Using the "solve" command I only get a few of these. Do you know any script that can obtain more solutions?

2) I have some (long) equations and want to be able to visualize them in different ways to make sense of it. So far I have only been using "simplify" and "combine", but it keeps on returning the same result even if I can see there are other possible ways of factoring the equation. How can I tell Maple to give me "different optiosn" as to visualize the equation?

Thank you all!!

## Plot x-t curve in 3D...

Hi there,

I am doing my assignment and struggling to do the last question: (only part (c))
code: Qmaple.mw
The left side shows the question. 3(d) is basically a phase portrait / vector field plot of a 2D system of differential equations on x-y plane. However,I am not sure how to extend it to 3 dimension. Moreover, for the second part, they ask me to plot x-t and y-t on the same graph,which is something similar to right hand side of the above picture (NOTE:THE plot doesn't represent the system in Question 4) . However,I've got the z term.How should I fix it?

## ToMma command for Mathematica translator ...

I am working on a problem collaboratively with someone that uses mathematica, and he is getting different input for the expression i have referred to in formal notation.

I found the MmaTranslator package, and see that there is a FromMma command, but i need to convert my maple input to mathematica so that he is able to work with the same expression in an interface familair to him.

## modification of an expression...

Hello people in mapleprimes,

I want to know some way, if there is, to do the modification of the following, that is

The original expression: (beta*L__1/P)^beta*((1-beta)*L__1)^(1-beta)
The expression after modification: beta^beta*L__1*(1/P)^beta*(1-beta)^(1-beta)

I did this with freezing (1-beta) in (1-beta)*L__1.
But, this is a little long code. I will be glad if you tell me some more simple way to do this.

nov_21_2017_mapleprimes.mw

## How to evaluate definite integral if function is i...

how to integrate this integral

g := simplify(int((s^3-5*s^2+1)/(s+2)^2, s = 0 .. x))

## Sample from a distribution fitted to some data...

I have a small data sample of some occurrence in time.  For an example lets take the time it takes kids to finish their lunch to determine wether a school has given them enough time for recess.

The times are (20,15,12,18,15,13,13,10,14,14,15,17,8,22,16) in minutes.

What distribution should I use?

Should I just calculate the mean and std. dev. from the data and generate a normal distribution, like below?
with(Statistics):
a:=[20,15,12,18,15,13,13,10,14,14,15,17,8,22,16]:
m:=Mean(a):
d:=StandardDeviation(a):
X:=RandomVariable(Normal(m,d)):

Sample(X,3) # generate a few samples

I could also randomly choose from the observed 15 data points.

combinat[randcomb](a,3) # randomly pick 3 of data points

Which method would be better?  Is randcomb following any kind of distribution?

## Animating a phase portrait with parameter...

Hi there,

I've been asked to do the following and now I'm struggling to do part (c) (Part (a) and (b) are irrelevant!)

code for part(c): Qmaple.mw

So I want to animate the system of differential equations when a=1,and b as the parameter varying from 0.5 to 3,also 0<=x<=5,0<=y<=5;while t could be any arbitrary range from 0 to,say,50.However, I am not sure where to include b in my code.