@rlopez 

Thanks

I am curious how this plot looks like : is there a example of this gradient vectorplot ?

@acer 

Thanks!

Great, now i can stay in the VectorCalculus package
 

@radaar 

Thanks

Never thought on this package 

I prefer the VectorCalculus package, because it is in the vector notation with the unitvectors

The with(Student[MultivariateCalculus]); version has interesting tutors
  

@Carl Love 

Thanks

The CD is from 1998 , yes for Maple V-4 and  want to learn more from vectorcalculus for using in partial differential equations

This error seems to be more difficult to solve

CH7B.mw
   

@Preben Alsholm 

Thanks

Got it now also working and i replaced " by % together with the (t)
Saved also from .mws (old) to .mw (new)
It are old worksheets and nowadays Maple has probably more to offer for easier visualising this topic ?
DYNAMIC DE plots 

The author has made a procedure for this 

@dharr 

Thanks

Don't get the worksheet  working yet unfortunately.

@Thomas Richard 

Thanks

I will look at it, what all new is and LinearAlgebraMigration is a help too

@Carl Love 
Thanks

I think  its a hopeless task , because matrix is written in capital letters in the old worksheets
So, i must restore this manual . .eh no with copy gifs ( much text ) 

Don't see another way 

@Mac Dude 

Thanks

There is no .mpl  extension as such in Maple V
I am afraid that this old sheets are not to restore for the current version of Maple

@Joe Riel 

Thanks

I made a mistake : It is the theory worksheet Dynamod.mws (now mw) you openened, but the answer worksheets are no complete anymore
I am not sure if the all theory worksheets are complete and also if all anwers worksheets are complete?
I think both two groups are missing text , pictures 

When i open them in Maple V-4 its all correct content

Uitw-03.mws

@Joe Riel 

Thanks

I did it again

@Preben Alsholm 

Thanks

I will study it again

Interesting question, because i quess there must be always a numerical solution to a ODE ?
I do see also there are certain conditions about Existence and Uniqueness of a ODE
Seems to me if there exists a closed (analytical ) solution of a ODE, then a numerical solution exitss too. 

@acer 

 "So, the version you cited didn't even produce the claimed output in the saved versions of those accompanying worksheets."

---------------------------------------------------------------------------------------

In Document mode, the reader should use the Exploration assistant for Interactive
Exploration.
Procedures. Declare local variables within procedures.
> # Program 1: Procedures.
> # The norm of a 3-dimensional vector.
> norm3d:=proc() local a,b,c;sqrt(aˆ2+bˆ2+cˆ2) end;
> norm3d(3,4,5);
5
√
(2)

Its from the pdf : dynamical systems with applications using Maple -second edition , page 9 (0.4. Simple Maple Programs)

Also included worksheet does not show the right code.

@Kitonum 

Thanks!

Finally knowing know how it works 
The example of the arithmetic mean of a sequence of numbers for any number of these numbers is astonishing
Don't know how it is constructed with a + and so on

Thinking on a standard formula for this:  arithmetic mean of a sequence of numbers for any number of these number