convert string to array number

Question

how to convert a string to an array of numbers? in example : str='1,2,3,4.5' to number=[1 2 3 4.5].

I wrote the code below, but it has a problem.

str='1,2,3,4.5';
tmp = regexp (str,',','split');
tmp2=[];
for(i=1:length(tmp))
tmp2(i)=cell2mat(tmp(i))
end

Future readers should check the answers to: stackoverflow.com/questions/14895220/… for very concise methods of converting strings to array of numbers. — Dan
– Dan, Commented Feb 15, 2013 at 13:25

Nzbuu · Accepted Answer · 2011-12-08 13:13:52Z

4

Technically, @ame.b's answer is the correct one. But for the sake of diversity, you can also do the following in this case, because the separators are ,:

str2num(str)

edited Dec 8, 2011 at 13:13

answered Dec 8, 2011 at 11:54

Nzbuu

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2 Comments

arne.b Over a year ago

Even better, I say! I just did not think of this one as I rarely use it myself.

Nzbuu Over a year ago

str2double is safer, especially since str2num is based on eval. I wouldn't recommend using str2num.

arne.b · Accepted Answer · 2011-12-08 10:29:18Z

3

str2double is what you need where you used cell2mat.

edit: You can even replace the final four lines (i.e. the for loop and the initialisation of tmp2) by a call to cellfun:

tmp2=cellfun(@str2double,tmp)

answered Dec 8, 2011 at 10:29

arne.b

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1 Comment

yuk Over a year ago

@ame.b: You don't need cellfun to run str2double on cell array of strings. Just str2double(tmp) should work.

nimrodm · Accepted Answer · 2011-12-08 19:38:25Z

3

I must be missing something here, but why can't you just use sscanf? For example:

sscanf('1,2,3,4.5','%f,')

ans =

 1.0000
 2.0000
 3.0000
 4.5000

answered Dec 8, 2011 at 19:38

nimrodm

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