On 10/8/20 7:16 AM, Nikki Holtzer wrote:
error: no match for ‘operator+’ (operand types are ‘const
dealii::SparseMatrix<double>’ and ‘dealii::SparseMatrix<double>’)
SparseMatrix has no operator+, so this will not work.
error: no matching function for call to
‘dealii::SparseMatrix<double>::add(double, dealii::SparseMatrix<double>&) const’
The usual case where this happens is if you are in a member function that is
marked 'const' and the object to which you try to 'add' something is a member
variable. For example in
class X {
SparseMatrix<double> A,B;
void my_function() const // <--- note the 'const'
{
A.add (1.0, B);
}
};
The 'const' on the member function is a promise that you will not change the
values of the members of this class, but A.add(...) will change the member
variable A. The compiler is telling you that this is not allowed.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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