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

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Dawid Strzelczyk
Dawid Strzelczyk 2020-10-16
评论： James Tursa 2020-10-16
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 个评论
Stephen23
Stephen23 2020-10-16
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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采纳的回答

Bruno Luong
Bruno Luong 2020-10-16
编辑：Bruno Luong 2020-10-16
"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 个评论
显示 2更早的评论
Bruno Luong
Bruno Luong 2020-10-16
AFAIK str2double never works on string with multiple numbers.
James Tursa
James Tursa 2020-10-16
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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