id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2587	Matrix concatenation isn't simplified properly in some cases	Per Östlund	somebody	"Matrix concatenation isn't simplified in cases such as these:
{{{
class BlockMatrix
  Real[3, 3]  P;
  Real[6, 6]  Q;
equation
  Q[1:3, 4:6] = [Q[1:3, 1:2], -Q[1:3, 3:3]];
  Q[4:6, 1:3] = [Q[1:2, 1:3]; -Q[3:3, 1:3]];
end BlockMatrix;
}}}
This results in the equations:
{{{
  Q[{1, 2, 3},{4, 5, 6}] = cat(2, Q[{1, 2, 3},{1, 2}], -Q[{1, 2, 3},{3}]);
  Q[{4, 5, 6},{1, 2, 3}] = cat(1, Q[{1, 2},{1, 2, 3}], -Q[{3},{1, 2, 3}]);
}}}
but cat should be simplified into matrix expressions in this case."	defect	closed	normal	1.9.1	Frontend	trunk	fixed