<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hi all<br><br>In the function MatMatMultTranspose(Mat A,Mat B,MatReuse scall,PetscReal fill,Mat *C) <br><br>is A has to be a square matrix ? <br><br>And what about the function MatTranspose(Mat mat,MatReuse reuse,Mat *B) is mat has to be a square matrix too ? <br><br>I am trying to use these functions with a rectangular matrix. but it doesn't work for me !<br><br>Thanks<br>Waad<br></td></tr></table><br>