Reading numbers from String

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Lukas Ehrler
Lukas Ehrler on 20 Jul 2022
Answered: Steven Lord on 20 Jul 2022
Hello,
I have the following string
str = {'SRm40_' 'SRp5_'}
I want to read the numbers from str and include the m for a minus.
my desired Output would look like this
numbers = [-40 5]
I have tried the sscanf and regexp function but i dont seem to get it working
sscanf returns this
[numbers,~,err] = sscanf(string(str(1)),'%*5d')
err = 'Matching failure in format.'
So it cant read the the string because the first location has the 'E'.
If someone has a idea how to solve this, dont hesitate to answer :)
Have a great day
  4 Comments
Lukas Ehrler
Lukas Ehrler on 20 Jul 2022
thanks a lot for the quick answer!!

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Accepted Answer

Stephen23
Stephen23 on 20 Jul 2022
Another approach:
str = {'SRm40_','SRp5_'};
vec = str2double(regexprep(str,{'[A-Z_]+','m','p'},{'','-','+'}))
vec = 1×2
-40 5

More Answers (1)

Steven Lord
Steven Lord on 20 Jul 2022
Yet another approach:
str = {'SRm40_','SRp5_'};
str = replace(str, 'm', '-'); % Handle negative numbers
str = replace(str, 'p', '+'); % Handle positive numbers
d = cellfun(@(x) sscanf(x, 'SR%d_'), str) % sscanf requires its first input to be scalar
d = 1×2
-40 5

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