Wrong result from calculation
조회 수: 1 (최근 30일)
이전 댓글 표시
Dear all,
I have a question about high precision calculation of the fraction 1/998001 in Matlab. I use
vpa(1/998001,200)
which produces the following result
0.000001002003004005005955287066314596255978131011943332850933074951171875
On the Numberphile channel on youtube, they prove that the result should be
0.000001002003004005006007 .. 996997999
which has higher precision than the obtain result in MATLAB and it appears that there is some numerical error. Do you have any idea why is that?
Thank you
Regards,
Veselin
댓글 수: 0
답변 (1개)
Steven Lord
2020년 6월 9일
By the time you call vpa, MATLAB has already performed the division in double precision. So you're displaying the double precision value that results from that division to 200 decimal places.
Perform the division symbolically.
x1 = vpa(1/998001, 200)
x2 = vpa(sym(1)/998001, 200)
댓글 수: 2
참고 항목
카테고리
Help Center 및 File Exchange에서 Assumptions에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!