	Campos 0.5 beta

	The object of this program is finding the derivated fields expressions of a given field: gradient, rotation, etc. in either rectangular, cylindrical or spherical coordinates. I am afraid that the program is not available in english yet, but its use is very simple.

The library has three commands. The main program, CAMPOS (spanish word for FIELDS) takes an argument from the stack, either an expression or a vector of THREE expressions (scalar or vectorial field), gives a choosebox to choose among rectangular ('Cartesianas') Cylindrical ('Cilndricas') or Spherical ('Esfricas') coordinates, and yet another choosebox with the available operations for that field, gradient and laplacian for scalar fields and divergency, rotation and laplacian for vectorial fields.

The time lapsed during the execution of the program can be high if the imput expression is not simple, indeed if you are finding a rotation or laplacian of a vectorial field.

The program CMENU shows another choosebox to choose among the three coordinate modes, and shows a menu with the three coordinates, in the right order. The purpose of this is to keep them available in order to create the field expression. This coordinates are:

Rectangular: X, Y, Z
Cylindrical: ro,fi, Z
Spherical: r, teta,fi

The program CMasn assigns the program CMENU to the 13.41 user keyboard position, which means that in User mode ( blue shift - alpha, USR appears on top of the screen) if you hold the alpha key and press C (F3) you execute the CMENU program.

	Program version an author information:

This 0.5 beta version is the first public version of this program. You can see if a newer version exists visiting www.navia.zzn.com. This software is beta, so no accuracy is guaranteed by the author. It is built entirely in User-RPL, so it is nearly impossible that it causes data loss to your calc.

This programs requires that your calc supports the new CAS command SIMPLIFY. You can check if it is available in the command CATalog. If you do not have it, perhaps if you create a program << EVAL >> and store it in HOME directory under the name SIMPLIFY , doing this before installing the library, then the whole thing may work. However, the good solution is upgrading to a newer ROM containing the command SIMPLIFY. 

Information about upgrading ROMs or installing libraries is available in www.hpcalc.org.

I thank everybody who use this program sending an e-mail to campos@navia.zzn.com with ideas or suggestions for the definitive version, notes about is usability, etc..

Csar Garca Garca.
cesar@navia.zzn.com
http://www.navia.zzn.com