Format exponent notation: start with 0

11 次查看（过去 30 天）
Arjan Lampe
Arjan Lampe 2021-4-29
评论： dpb 2021-4-29
If I print a floating point f in exponential notation, I get, say:
>> sprintf('%10.3E',f)
ans =
' 2.091E+05'
Can Matlab always make the leading digit a zero, always, so:
>> sprintf('%someMagicHere',f)
ans =
' 0.209E+06'
I want this irrespective of the exponent.
(I know you print less significant digits this way)
  4 个评论
显示 2更早的评论
dpb
dpb 2021-4-29
Yes, that's what P multiplier does...changes the displayed scaled factor for the exponent.
dpb
dpb 2021-4-29
Yes, that's what P multiplier does...changes the displayed scaled factor for the exponent.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Star Strider
Star Strider 2021-4-29
Ran in:
I am not certain what you are asking.
I wrote a little utility function for my own use a while back to do something like this —
a=-0.07639297;
expstr = @(x,n) [x(:).*10.^(-n*floor(log10(abs(x(:)))/abs(n))) n*floor(log10(abs(x(:)))/abs(n))];
Result_1 = sprintf('%+0.7fE%+04d', expstr(a,4))
Result_1 = '-763.9297000E-004'
Result_2 = sprintf('%+015.7fE%+04d', expstr(a,4))
Result_2 = '-000763.9297000E-004'
Putting a leading 0 in the format (just after the %) willl fill the numeric filed to the left of the decimal with leading zeros. See Optional Operators in the formatSpec section of the sprintf documentation.
Experiment with it to get the result you want.
  2 个评论
Arjan Lampe
Arjan Lampe 2021-4-29
Ok, but then I need to know the value for the exponent ahead of printing. In principle it can work though, not as simple as I had hoped...
Star Strider
Star Strider 2021-4-29
It depends on what you want to do. The examples posted originally had different exponents, and my utility function allows that to change.
The format descriptor syntax is the same, regardless. That is a property of sprintf, fprintf, and others (such as compose) that share that syntax.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Fortran with MATLAB 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by