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);