Syntax to add matrix in existing register
How would I add a matrix to an existing register?  
RecordAddBegin(CommodityVc,"CommodityVc_1");
  RecordField(Math,M4Matrix,0,0);
  ArrayBegin(Math,-,1);
  ArrayField(Country,M4Code,5,CountryVc);
  ...
Created byNeil00:28 24 Apr 2020