round off in matlab

Question

0 个投票

Hi,

I am running a large simulation in matlab. I have noticed that matlab rounds off after 4 decimal places and this affects my results.

Is there a way to give a command at the beginning of the program so that matlab does the round off after about 10 decimal places?

Thanks.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Roger Stafford 2013-4-6

编辑：Roger Stafford 2013-4-6

在 MATLAB Online 中打开

Matlab's 'double' does not round off after four decimals as far as the actual computations are concerned. It is always accurate to about 16 significant decimal digits. It's only the display of its results that is given to four digits if you are using format short. It is important to understand the difference.

Try this experiment.

 format short
 x = pi^2
 fprintf('x = %19.16f\n',x)

The second display is accurate to 16 places which means that this was the accuracy of the original computation. The 'short' format only displayed four of the significant digits.

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question