Re: TWO questions to experts, (academics & pratical)

[Sonnet Nguyen <sonnet@theta1.ifpan.edu.pl>]

Hi,
On Wed, 26 Mar 1997, Aiviet Nguyen wrote:

> Sure, there are quite a lot in Fortran and in C. You can also write one 
> by yourself if no additional requirements are needed.


Your answer is as usually "too general".  Each person perfectly knows
about that.  
Of course, I can write (and I've written a lot), but my products are 
useful and convenient only for my uses.  (For solving only special types
of equations (for eg: fixed functional coefficients, etc.), and
convergence of algorithm is not verified for variety of boundary
conditions)   

Let consider for example the Navier-Stokes equation.  Problems of
hidrodynamics and fluid dynamics (and many problems of NASA, BOEING) are
reduced to solving this equation with different (arbitrary) boundary
conditions. 
But could you imagine yourself a patological boundary consisting of 
100.000 different elements? (For interesting applications, boundary
consists of more than 1 million diff. elements).  Do you know how many
institutes of fluid dynamics are in the world? 
For what, if each student can write a program solving Navier-Stokes
equation.   The problem is that program must be convenient (for
engeeners) and algorithm of solving is tested and optimalized.  
Not everything is "simple" and "beauty" as in Pure Math or in theoretical
physics.

regards,
SN