MATLAB: Case insensitive strfind

strfind strcmp strcmpi

I have a matrix in which there are about 100,000 sentences that I want to scan for the existence of certain words (True/false). For previous scans, searching for one exact word, I used the strfind. Nevertheless, now I have a list of 18 words which might be written in lower or upper cases in the sequences. The strcmpi which could be useful in this case only returns positive if the whole sentence consist of the word… Is there another function I missed?

Thank you

Best Answer

Hi,

one simple method would be to use lower on both the sentences and the words you are using ...

Titus

Related Solutions

MATLAB: Upper case need help

str=char(mod(double(lower(str))-97+shift,26)+97);

MATLAB: Capitalizing every word in a string

I like simple Matlab code:

m      = [false, isspace(str)];
m      = m(1:length(str));
str(m) = upper(str(m))

By the way, tested with: '', ' ', 'a', 'aA', ' a', ' a ', ' ab c', ' ab c ' .

Some timings:

str0='The bottom of the deep blue sea';
tic
for k = 1:1e4
  str    = str0;
  m      = [false, isspace(str)];
  m      = m(1:length(str));
  str(m) = upper(str(m));
end
toc
tic
for k = 1:1e4
  str = str0;
  str = regexprep(str,'(\<[a-z])','${upper($1)}');
end
toc
0.17 seconds  % Simple Matlab
3.24 seconds  % Powerful REGEXP

Best Answer

Related Solutions

MATLAB: Upper case need help

MATLAB: Capitalizing every word in a string

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