### A.1.9 Dynamic modules

The purpose of the following example is to illustrate the use of dynamic modules. Giving an example on how to write a dynamic module is beyond the scope of this manual. A technical reference is given at http://www.singular.uni-kl.de/Manual/modules.pdf.

In this example, we use a dynamic module, residing in the file `kstd.so`, which allows ignoring all but the first j entries of vectors when forming the pairs in the standard basis computation.

    ring r=0,(x,y),dp;
    module mo=[x^2-y^2,1,0,0],[xy+y^2,0,1,0],[y^2,0,0,1];
    print(mo);

    // load dynamic module - at the same time creating package Kstd
    // procedures will be available in the packages Top and Kstd
    LIB("kstd.so");
    listvar(package);

    // set the number of components to be considered to 1
    module mostd=kstd(mo,1);        // calling procedure in Top
                        // obviously computation ignored pairs with leading
                        // term in the second entry
    print(mostd);

    // now consider 2 components
    module mostd2=Kstd::kstd(mo,2); // calling procedure in Kstd
                        // this time the previously unconsidered pair was
                        // treated too
    print(mostd2);

User manual for Singular version 4-0-3, 2016, generated by texi2html.