I just checked some of the source code in the Suse Linux factory package
pgcalc-2.2-263.16 and I noticed the following

$ egrep "new|delete" ../BUILD/pgcalc2-2.2-6/src/amatrix.cpp | fgrepCells
   Cells = new CComplex[ Rows * Cols ];
   Cells = new CComplex[ Rows * Cols ];
      Cells = new CComplex[ Rows * Cols ];
         delete Cells;
      Cells = new CComplex[ ACol * ARow ];
         delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
      delete Cells;
   Cells = new CComplex[ Cols * Rows ];

Suggest replace all ten deletes with

  delete [] Cells; Cells = NULL;