This behavior seems rather odd.  Is it documented anywhere?

I expected that final result to be [3,4].  Why is it [a,b]?

I know that I can do eval(convert(v, list)) to get the numerical value, but why is the eval necessary?

1. Why doesn't simplify(subs(...)) as a single expression work?

simplify(subs(z = -z, erf(z)));
subs(z = -z, erf(z));
simplify(%);
                           erf(-z)
                           erf(-z)
                           -erf(z)

2. This just hangs. Would be nice if simplify could deal with this, but in any case I don't think it should take so long:

timelimit(60, simplify(n <= p*n+sqrt(n)*p*(1-p))) assuming n > p*(n+(1-p)*sqrt(n));
Error, (in assuming) when calling '`property/ObjProperty`'. Received: 'time expired'

3. It seems that assuming doesn't like f(constant) objects. Doesn't seem right, because x(a) would work fine:

simplify(abs(x(0))) assuming x(0) > 0;
                          abs(x(0))

simplify(abs(y)) assuming x(0) > 0, y > 0;
Error, (in assuming) when calling 'assume'. Received: 'cannot assume on a constant object'

4. Can simplify be made to work on things like this (since it can handle the coefficient at (t+1))?

simplify((sqrt(1-I)*sqrt(1+I)-sqrt(2))*(t+1));
               -(-sqrt(1-I)*sqrt(1+I)+sqrt(2))*(t+1)

Hello everybody, 

I use Maple to obtain the solution of a reccurrence equation :
r := rsolve({u(n)=n*(u(n-1)+1), u(0)=0}, u)

Now I want to define a function s(n) wich returns the integer value of the nth term u(n).
In the attached file three different attempts to compute the numerical value of s(2) (you can replace "2" by any other positive integer) are given.

• S := unapply(r, n);
   
• S := unapply(convert(r, sum), n);
   
• S := unapply(simplify(convert(r, sum)), n);

But none of them returns an integer and I'm always forced to apply some operation to "transform" the output into the desired integer.
Could you please help me to understand why it is so ?

Thanks in advance

2018.mw

​​​​​​use epilson- delta definition of a limit to prove that

Limit as x approaches 5 of 1/x =1/5

There seems to be a bug: in some of the cases, the intersection command works, in others it doesn't.

I'd appreciate any hints as to why this is the case.

intersection_of_two_lines.mw

Hello,

I think its a simple question and I hope, someone can help me. For Example:

I have a list of numbers ("M") and I want to write these numbers in a new List but with the restriction

if x<M_i then M_i*2
else M_i 

Can someone explain how to solve this in maple?

Thank you very much.
Maritn

I am looking for a pragmatic solution to the question: Can my rolled carpet fit inside a given cardboard box?

It is the (generally unsolvable) problem "straw in a box":

https://www.maa.org/sites/default/files/pdf/upload_library/22/Polya/jerrard93.pdf

...with the restriction that the cylinder is aligned along the spatial diagonal.

So the application is this:
Is it possible to put a 120cm long rolled (radius 10cm) carpet inside a cardbord box of (inner) dimensions 118cm x 58cm x 38cm ?

Maple code would be perfect, but I have very little Maple experience so I cannot even provide any attempts/code at this stage.

Thanks!

A Happy New Year, people in mapleprimes,

I have a question, but this might be an inappropriate question to this site.

In Introduction to Maple, there is a calculation with a double square root.
Related to it, I want to calculate the following expression, which has a value of zero.

-3*(sqrt(10+4*sqrt(5)))+sqrt(50+20*sqrt(5))+sqrt(10-4*sqrt(5))+sqrt(50-20*sqrt(5));

Is there any way to use maple  so as to explain how the above expression takes the value of zero?

On earth, I cannot understand why this takes zero.

I hope you will give me a hint.

Thanks in advance.

I am trying to assess stability from real roots of Eigenvalues that are returned in the RootOf from. I tried allvalues(), evalf() both return the same RootOf list. If memory serves me correctly any square matrix should have and Eigenvalue solution.

Any suggestions?

Eignevalues.mw
 

Download Eignevalues.mw
 

Download Eignevalues.mw

Dears,

Consider the problem min{|a+2*i| : i integer}, where a is a number of the form 2^k*t for a fixed integer k>1 and t in [0,1]. A simple checking shows that i must belongs to the interval [-(1+a)/2,(1-a)/2] and as the legth of this interval is 1, there is two integers in this interval.

How can I compute this integer i with Maple? The commad "ceil" not seem very suitable. Some idea?
Many thanks in advance for your comments.

At the beginning of my work sheet I used the matrix palette to create several matrix. Now when I try to use the palette this is what I get. 

`Matrix(2, 3, {(1, 1) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("1"), Typesetting:-mo(","), Typesetting:-mn("1"))), (1, 2) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("1"), Typesetting:-mo(","), Typesetting:-mn("2"))), (1, 3) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("1"), Typesetting:-mo(","), Typesetting:-mn("3"))), (2, 1) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("2"), Typesetting:-mo(","), Typesetting:-mn("1"))), (2, 2) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("2"), Typesetting:-mo(","), Typesetting:-mn("2"))), (2, 3) = Typesetting:-msub(Typesetting:-mi("n"), Typesetting:-mrow(Typesetting:-mn("2"), Typesetting:-mo(","), Typesetting:-mn("3")))})`

To get a matrix from the palette I have to create it on a new worksheet and cut and past it into the existing work sheet.

What is happening?

Hi, I am a Maple newbie. My problem is I do not know how to generate the result to find the answers of these question: 

1. a)   Sketch the surface area of the part of paraboloid z = x² + y² that lies under the plane z=8.

b)   Compute the surface area.

2. a)   Sketch the solid that lies above the cone z = (x² + y²)^1/2 and inside the sphere x² + y² + z² = 16.

b)   Compute the volume of the solid.

It is possible to calculate these question? Does anyone has a suggestion? Thank you. 

Hi all,

Please help me to get a solution for all the desired data in the attached file. As you could see through it, just for 4 out of 20 desired Br, there are answers by the command:
Notice that If I write Br= -7.0 there is no solution, but I wrote Br= -6.999999, and the solution was achieved simply; just by applying an approximation value for '7'.
 

I don't know why for other data there are no solution...

Best

System_of_Equations.mw

how to see all steps of solution in maple? for eg: any second order differential eq.