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4.17.1 proc declaration
- Syntax:
- [
static ] proc proc_name [(<parameter_list>)
[<help_string>]
{
<procedure_body>
}
[example
{
<sequence_of_commands>
} ]
- Purpose:
- Defines a new function, the
proc proc_name. Once loaded in a
SINGULAR session, the information provided in the help string will be
displayed upon entering help proc_name; , while the example
section will be executed upon entering example proc_name; .
See Parameter list, Help string, and the example in
Procedures in a library.
The help string, the parameter list, and the example section are optional.
They are, however, mandatory for the procedures listed in the header of a library.
The help string is ignored and no example section is allowed if the procedure is defined
interactively, i.e., if it is not loaded from a file by the LIB or load
command (see LIB and see load ).
In the body of a library, each procedure not meant to be accessible by
users should be declared static. See Procedures in a library.
- 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
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See
LIB;
Libraries;
apply.
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