Extract numbers from char type
47 次查看(过去 30 天)
显示 更早的评论
how can I extract the numbers from a character array value of '4.64 km' and return them as 4.64?
0 个评论
采纳的回答
Star Strider
2022-10-18
编辑:Star Strider
2022-10-18
Probably the easiest way —
s = '4.64 km';
c = regexp(s, '\d*\.\d*|\d*', 'match')
n = str2double(c)
EDIT — (18 Oct 2022 at 19:38)
In the event any of the numbers are negative —
s = '4.64 -42 2 -3.14 km';
c = regexp(s, '(\-\d*|\d*)\.\d*|(\-\d*|\d*)', 'match')
n = str2double(c)
.
4 个评论
Star Strider
2022-10-19
I saw that and wondered, however I did not change my answer, and just learned from the important parts of your syntax.
更多回答(2 个)
Les Beckham
2022-10-18
Or, in one line of code:
s = '4.64 km';
num = sscanf(s, '%f') % num will be a double
1 个评论
Walter Roberson
2022-10-18
Yes this works well when the number is at the beginning. You can also put literal text into the format if you expect an exact match.
The suggestions to use regexp to extract the text of the number work well when you need flexibility.
In cases where you have tables of text see textscan() which can be used on a character vector that has embedded newlines.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Data Import and Export 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!