There is a probem in the Optimization package's (nonlinear programming problem) NLPSolve routine which affects multivariate problems given in so-called Operator form. That is, when the objective and constraints are not provided as expressions. Below is a workaround for this.

Usually, an objective (or constraint) gets processed by Optimization using automatic differentiation tools ...

An interesting discussion on rule-based integration and a new symbolic computer algebra package for it, named Rubi is ongoing in this long usenet thread.

(The Rubi link above seems to work ok, although the link in the top article of that usenet thread may not. YMMV.)

There's also some interesting subtext related to how practical developments in computer algebra systems can come about.

Here is yet another finesse (new to me) in getting better performance for some floating-point computation involving the Statistics package.

> restart:

> X:=Statistics:-RandomVariable('Normal'(0,1)):

st:=time():
seq(Statistics:-Quantile(X,1/i,numeric),i=2..10000):
time()-st;[%%][-1];
                                    6.786
                                -3.719016485

> restart:

> X:=Statistics:-Distribution(Normal(0,1)):

This post had a centered H2 header that appeared fine in the wysiwyg post editor during composition but is absent in the Preview or actual Post (in my firefox 3.6.6).

It appeared in the source view, during composition in the editor, like this,

<h2 style="text-align: center;">This my header.</h2>

I tried it also in an earlier submission, with the same result. When I attempt to re-edit that comment, the header was then missing in the source view as well as the posted view.

Could it be, that the submission step causes some html content to vanish?

Happy Dominion Day.  

acer