清空筛选条件
清空筛选条件

Decimal number between 0 and 1 without the integer part?

1 次查看（过去 30 天）
Rahul Pillai
Rahul Pillai 2017-10-4
编辑： Jan 2017-10-4
Hi, I am trying to plot some outputs on a graph as text and I am basically plotting several points and need to conserve on space. Is there anyway I can plot a number between 0 and 1 , for eg, "0.25" as ".25" ignoring the 0? This is to be plotted as text() on the graph and so I'm using the num2str(x,y) function.
  2 个评论
John BG
John BG 2017-10-4
Hi Rahul
this is John BG jgb2012@sky.com
per isakson answer only takes 2 decimals, regardless of the actual amount of decimals.
Wouldn't it make more sense to first measure the amount of decimals and then generate a string with all decimals?
Jan
Jan 2017-10-4
@John BG: What is the "actual amount of decimals"?
sprintf('%.17g', 0.1 + 0.1 + 0.1)
0.30000000000000004
Because most decimal number do not have an exact representation in the binary IEEE754 format, it would be required to round to a certain number of decimals before you can decide, how many decimals a number has. This will be more or less arbitrary.
If there is enough space for more digits, Rahul can simply use num2str(x, 3) or even omit the specification of the number of digits.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

per isakson
per isakson 2017-10-4
This code strips off leading zeros; replaces leading zeros with an empty string.
>> str = regexprep( num2str( 0.25, 2 ), '^0*', '' )
str =
.25
>>

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Characters and Strings 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