NaN from str2double('1 2 3') on Matlab 2020a

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Hi
str2double('1 2 3') returns NaN on Matlab 2020a but works fine on Matlab 2018b & Matlab 2016b (returns: 1 2 3).
How to convert a string of numbers to numbers in the newest Matlab version?
Best,
Dawid
  1 Comment
Stephen23
Stephen23 on 16 Oct 2020
For all MATLAB versions the most efficient soluton is:
str = '1 2 3';
vec = sscanf(str,'%f')
Avoid str2num, it contains a hidden eval call...

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Accepted Answer

Bruno Luong
Bruno Luong on 16 Oct 2020
Edited: Bruno Luong on 16 Oct 2020
"works fine on Matlab 2018b"
Are you sure?
>> version
ans =
'9.5.0.1298439 (R2018b) Update 7'
>> str2double('1 2 3')
ans =
NaN
>> str2num('1 2 3')
ans =
1 2 3
>>
  4 Comments
Bruno Luong
Bruno Luong on 16 Oct 2020
AFAIK str2double never works on string with multiple numbers.
James Tursa
James Tursa on 16 Oct 2020
One more data point, PCWIN:
>> version
ans =
'9.5.0.944444 (R2018b)'
>> str2double('1 2 3')
ans =
NaN
>> str2num('1 2 3')
ans =
1 2 3

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