Ask Your Question

Revision history [back]

click to hide/show revision 1
initial version

Unexpected error in a notebook

I have a long notebook which works nicely. And, suddenly, when I call an already defined function I have this error message

unsupported operand parent(s) for -: 'Integer Ring' and '<class 'sage.plot.graphics.graphics'="">'

Could someone help me to understand what happen ? I cannot give the code here it is too hudge because I have tried to do as in Mathematica a self contain notebook.