CoCoA » CoCoA-5

Which printing commands should allow themselves to be interrupted?

• lists
• matrices
• ideals (?)

I think probably not polynomials (nor very large integers):

• for large integers it would be tricky because they are internally converted to a string, which is then printed with a single C++ fn call
• for polynomials we could perhaps check for interrupts between printing terms, but I am concerned that too many checks for interrupts might have a perceptible impact on speed (though the checks should be quite cheap); also note that polynomials can have a "recursive structure".

I had thought about checking for interrupts, say, every 100 terms in a poly. But then it is possible to create a large recursive polynomial where no check is made: consider (1+x+x^2+...+x^99)*(1+y+y^2+...+y^99)*(1+z+z^2+...+z^99) in the ring QQ[x][y][z].