Singular Manual: proc declaration

  | ### 4.18.1 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
See LIB; Libraries; apply.

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