Round with significant digits

版本 1.6.0.0 (3.1 KB) 作者: François Beauducel
Rounds towards the nearest number with N significant digits.
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更新时间 2015/4/3

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编者注: This file was selected as MATLAB Central Pick of the Week

This little function rounds a number (or the elements of a vector ot matrix) towards the nearest number with N significant digits.
Examples:
roundsd(0.012345,3) returns 0.0123
roundsd(12345,2) returns 12000
roundsd(12.345,4,'ceil') returns 12.35
This is a useful complement to Matlab's ROUND, ROUND10 and ROUNDN (Mapping toolbox), especially when dealing with data with a large variety of order of magnitudes.

I was about to upload this file when I found "sd_round.m" by Edward Zechmann (see aknowledgment), which has similar feature (and more). But, because my script is very different in coding (much much shorter), I decided to share it anyway.

引用格式

François Beauducel (2024). Round with significant digits (https://www.mathworks.com/matlabcentral/fileexchange/26212-round-with-significant-digits), MATLAB Central File Exchange. 检索时间: .

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版本 已发布 发行说明
1.6.0.0

fix a problem with vectors with negative and positive exponent values (problem since the last update only).
1.5.0.0

solve the floating point arithmetic problem with roundsd(3.55,2) pointed out by Will and Yuri K.
1.3.0.0

- adds different methods for rounding;
- corrects a bug for 0 values (now produces 0 instead of NaN), thanks to Daniel Armyr's comment.
1.2.0.0

works with negative numbers.
1.1.0.0

works with negative numbers.
1.0.0.0