subtracting a number from string

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moaad abd allatif
moaad abd allatif 2019-5-21
评论： Star Strider 2019-5-21
how i can subtract a number from string ?
for example :
subject1_EO - i want to extract only number one..

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回答（2 个）

Star Strider
Star Strider 2019-5-21
One approach:
str = 'subject1_EO';
nrc = regexp(str, '\d+', 'match')
nr = str2double(nrc{:})
producing:
nrc =
1×1 cell array
{'1'}
nr =
1
  2 个评论
Stephen23
Stephen23 2019-5-21
+1 a cunning use of a comma-separated list combined with the demand-driven output of nested functions. Explicit indexing is clearer though:
nr = str2double(nrc{1})

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Stephen23
Stephen23 2019-5-21
编辑：Stephen23 2019-5-21
The most efficient solution by far (and simple too!):
>> str = 'subject1_EO';
>> val = sscanf(str,'subject%f')
val = 1

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