Question

I think There is something wrong in Matlab relative to the number of decimal places used to display the number e. If put

>> sprintf( %.30f ,exp(1))

ans =

2.718281828459045500000000000000

enter code here

I think this is wrong because The number and contains an infinite number of decimal places instead of just the 16 that matlab show in this example. Does anyone know how I can get better accuracy using Matlab? Thank you.

Answer 1

无。

由于缺席,Matlab的数字由杜倍-精度浮动点。这些地方有52个红线,大约相当于16个重要人物。将马塔布拉克印刷出更多精彩的地方,不会产生更精确性。

这非常不可能比这更精确。

Answer 2

Matlab uses IEEE double precision, so that s as good as you will get for vanilla Matlab.

http://www.mathwork.com/support/solutions/en/data/1-1AGHW/?solution=1-1AGHW 建议将支持可变精确度算术的“数字数学工具箱”。或者使用另一个工具,如地图。

Answer 3

http://www.mathwork.com/company/newsletters/news_notes/pdf/Fall96Cleve.pdf” rel=“nofollow”>doubletail and MATLAB 。

In the full IEEE system, this spacing is 2- 52. MATLAB calls this quantity eps, which is short for machine epsilon.

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Before the IEEE standard, different machines had different values of eps. The approximate decimal value of eps is 2.2204 • 10-16. Either eps/ 2or eps can be called the roundoff level. The maximum relative error incurred when the result of a single arithmetic operation is rounded to the nearest floating-point number is eps/ 2. The maximum relative spacing between numbers is eps. In either case, you can say that the roundoff level is about 16 decimal digits.

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