How to resolve problem in for loop?
조회 수: 2 (최근 30일)
이전 댓글 표시
a=java.math.BigInteger(100)
for i=1:a
a*a;
end
Undefined function '_colonobj' for input arguments of type 'java.math.BigInteger'.
Any help in this regard is much appreciated. Thanks
댓글 수: 0
답변 (1개)
John D'Errico
2021년 12월 11일
편집: John D'Errico
2021년 12월 11일
Is "a" a number, in the form MATLAB will expect it? NO! a is a BigInteger number. You cannot use the colon operator on a.
a=java.math.BigInteger(100)
whos a
So you could have used a loop like this:
for i = 1:double(a)
As far as the actual loop goes, What do you think this
a*a;
does? NOTHING. Well, it does something. It throws an error. Because again, multiplcation is NOT supported in MATLAB between java.math.BigInteger objects. And even if it was supported, it would do nothing useful in MATLAB, just dumping the result into the bit bucket.
Anyway, if you want to multiply BigInteger numbers, the Java toolbox provides such a tool. Admittedly, it is a bit of a pain in the neck. This is why I put my own wrapper around those tools for use in MATLAB.
댓글 수: 4
John D'Errico
2021년 12월 11일
편집: John D'Errico
2021년 12월 11일
Lol. You are wasting your time.
Do you understand how big is that number?
log10(2589665665565686656656)
Over two sextillion.
Not much smaller than Avogadro's number. You want to loop THAT many times?
Are you running that loop on a super computer the size of the earth? Lets see. If you can run one billion loops per second, as I recall, there are roughly 31 million seconds in a year. So that will still take on the order of 85000 YEARS to finish the loop.
Are you a bit of an optimist? Or do you just have plenty of time to kill? Maybe you want to re-read the complete works of Shakespeare a few quadrillion times while you wait for it to finish?
참고 항목
카테고리
Help Center 및 File Exchange에서 Loops and Conditional Statements에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!