I had this problem in the past. I guess it has something to do with an update of the Java driver. But I am not sure.

@Thomas Richard 

Thanks a lot. Missed that one completely!

Sorry!

@Thomas Richard 

Thanks a lot!

Yes, a lower number of digits is acceptable (the reason for the high number of digits is that I want to compare different methods of estimation (and I am not capable to compare these methods algebraically).

@Thomas Richard 

Here is a stripped version which also produces the same error.

kernel_connection_lost_error.mw

@dharr 

Thanks a lot!

There is still a lot to learn for me.

kind regards,

Harry

@acer  Thanks! exactly what I need! 
kind regards,
Harry Garst

@mmcdara 

Thanks for your reply.

in 2D these plots make clear that rotation changes the variance of the projections:

I found these animated gifs here:

https://stats.stackexchange.com/questions/2691/making-sense-of-principal-component-analysis-eigenvectors-eigenvalues

In 3D I think the projections should be on a plane. I would like to make semi-transparant XYZ planes with projections on them for a few points. Sure, it would be a mess if the data cloud consists of a large number of observations.

I never seen an animation in 3D using a rotating XYZ plane with projections on them for a few data points.

Maple animations can be very insightful, at least for me.

@mmcdara 

Thanks a lot! This is really helpful. 

kind regards,

Harry

@mmcdara 

A mixture model will be fine.

But on a general level I am trying to figure out the equations for the EM algorithm:

http://www.di.fc.ul.pt/~jpn/r/EM/EM.html

https://www.youtube.com/watch?v=StQOzRqTNsw

However, a Maple demonstration would be great.

My other questions (tetrachoric and polychoric correlations) could probably be solved with the 'fsolve' command and a bivariate normal distribution (as suggested by a collegue). Comparing observed proportions in a contingency table and expected proportions in a bivariate distribution with  a fixed correlation coefficient, but at least for polychoric correlations it has to be solved iteratively.
In R the code would be available, but to translate R into Maple may not be an easy job.

Thanks both of you!

I learned something new again!

Harry

@tomleslie 

Maybe the OP meant Tanis and not Tannis.

If so, you can find everything on this website: 

http://www.math.hope.edu/tanis/maplemat.html

@tomleslie 

I did not choose it: it is the default option in my version of Maple.

I started using Maple in 1995 when everything was rather simple. All the later innovations in the interface I have tried to ignore. 

What is now the preferred way and why are there so many options?

@Carl Love 

Amazing!

(My only consolation is that there seems to be no single Maple command to accomplish the splitting of polynomials this way. Perhaps no one thinks this is a fruitful strategy).

@John Fredsted 

Thank a lot! 

(It took me a whole day to write the proc and you write only one line and the result is the same!)

@Kitonum 

Thanks a lot!

I still cannot find it in the HELP pages. 

Harry