4.13.1 proc declaration

Syntax:

[static] proc proc_name [parameter_list]
["help_text"]
{
     procedure_body
}
[example
{
     sequence_of_commands;
}]
proc proc_name = proc_name ;
proc proc_name = string_expression ;

Purpose:

defines a new function, the proc proc_name, with the additional information help_text, which is copied to the screen by help proc_name; and the example section which is executed by example proc_name;.
The help_text, the parameter_list, and the example section are optional. The default for a parameter_list is (list #), see Parameter list. The help and example sections are ignored if the procedure is defined interactively, i.e., if it was not loaded from a file by a LIB command.
Specifying static in front of the proc-definition is only possible in a library file and makes this procedure local to the library, i.e., accessible only for the other procedures in the same library, but not for the users.

Example:

proc milnor_number (poly p) { ideal i= std(jacob(p)); int m_nr=vdim(i); if (m_nr<0) { "// not an isolated singularity"; } return(m_nr); // the value of m_nr is returned } ring r1=0,(x,y,z),ds; poly p=x^2+y^2+z^5; milnor_number(p); → 4

See LIB; Libraries; Procedures.