Most error messages are self-explanatory. The message gives the size of the matrices involved. Matrix types are referred to by the following codes:
Matrix or vector Rect Symmetric matrix Sym Band matrix Band Symmetric band matrix SmBnd Lower triangular matrix LT Lower triangular band matrix LwBnd Upper triangular matrix UT Upper triangular band matrix UpBnd Diagonal matrix Diag Crout matrix (LU matrix) Crout Band LU matrix BndLUOther codes should not occur.
See the section on exceptions for more details on the structure of the exception classes.
I have defined a class Tracer that is intended to help locate the place where an error has occurred. At the beginning of a function I suggest you include a statement like
Tracer tr("name");where name is the name of the function. This name will be printed as part of the error message, if an exception occurs in that function, or in a function called from that function. You can change the name as you proceed through a function with the ReName function
tr.ReName("new name");if, for example, you want to track progress through the function.