## 50 Reputation

16 years, 25 days

## MaplePrimes Activity

### These are replies submitted by YasH

I do not know the best answer for your question.  But, an intersection of two planes is a line , which can be described by one parameter.  So, for example, how about

VectorCalculus[SpaceCurve]  . The help page of this command is:

http://www.maplesoft.com/support/help/Maple/view.aspx?path=VectorCalculus%2fSpaceCurve

## @Preben Alsholm     ...

@Preben Alsholm      I have not yet understood  sarra's goal.

## What is your question ? Do you want to k...

What is your question ? Do you want to know how to plot out_fig ?

## @felipe_p    According to...

According to

http://www.maplesoft.com/support/help/Maple/view.aspx?path=plots/display

'display()'  has L or A or P as the 1st argument.

Which corresponds to the 1st argument of your 'display(p0,p1)' ?

## >  I follow the usual procedure ...

>  I follow the usual procedure 'display(p0,p1)' I only get p1...

Have you generated p0 successfully ?

## I cannot understand the meaning of each ...

I cannot understand the meaning of each argument of "P" in the example.

## What is "HFloat(HFloat(undefined))" ? &n...

What is "HFloat(HFloat(undefined))" ?

## @Timm  I cannot understand what the...

@Timm  I cannot understand what the problem was and is.  Please explain more details.

@etiennepellegrini Please explain by using concrete minimum Maple program and concrete minimum fortran program.

According to

http://www.maplesoft.com/support/help/Maple/view.aspx?path=Fortran_order

, the default order of Matrices is Fortran_order.

## What was your input ?  ...

I now explain:

S1(n) := sum((-1)^(i-1)*factorial(n)/(i^2*factorial(i-1)*factorial(n-i)), i = 1 .. n)

and

S2(n) := sum(1/i, i = 1 .. n).

As you pointed out, it is easy to prove

S1(n) = S2(n)

by maple. And, you also pointed out

S2(n0)-S2(n1) = B .

I quote here the definition of B:
B := sum(1/(n1+i), i = 1 .. n0-n1);

So, what I want to show is

S1(n0)-S1(n1) = A .

But I cannot show this equality.

I quote here the definition of A:
A := sum((-1)^(i-1)*factorial(n0)/(factorial(n1)*(n1+i)^2*factorial(i-1)*factorial(n0-n1-i)), i = 1 .. n0-n1);

The denominator of S1 has only two factorials whereas that of A has three factorials.

## What do you want to know ?  ...

What do you want to know ?

## @Markiyan Hirnyk  I have not yet un...

I have not yet understood why you wrote "By default Digits:=10".

## @Markiyan Hirnyk  Thank you for you...

Thank you for your comment. And I noticed the following help:

"The Floating-Point Environment" in

http://www.maplesoft.com/support/help/Maple/view.aspx?path=Optimization%2fGeneral%2fComputation

## @Markiyan Hirnyk  When I click on t...

When I click on the link "screen22.01.14.docx", my browser shows:

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Server Error 404