len(list) & ceil(log(4,2)) bugs
I was programming functions in Sage for Big numbers and found a few bugs.
I emailed Jason-sage and he suggested this forum.
I hope my contributions can help building a better system.
I run Sage 4.7.2 in a new Firefox offline via the Oracle Virtual Box for Fedora on an old Windows Vista, so that could have something to do with it.
Suddenly the Python len(list) function wasn't working anymore on a simple
I repasted the same code on a new Worksheet and the len() function could be called again.
I had output that was becoming very slow for mysterious reasons (a 2 to 3 seconds time lag) for some simple small values. I used
t = cputime() before and
cputime(t) after blocks of code and found the responsible...
CODE INSIDE FUNCTION:
def myfunction(num): # stops for up to 3 seconds if num == 4 t = cputime(); sad = ceil(log(num, 2)); print(cputime(t)); for m in range(2,12): myfunction(m);
The problem is the
ceil() around the
log() I believe, but why at 4 and why only when that 4 is a function argument (not a local variable or a hard-coded 4) that is originally part of a range array?
happy = ceil(log(num+0, 2));
These bugs seem to an innocent amateur like me that Sage is an unstable system.
However, I love the potential of this software!
Best Regards, GigaGerard