determine the limit of txt file while using regexp

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sermet
sermet 2015-9-14
评论： sermet 2015-9-15
content = fileread( 'trial.txt' ) ;
matches = regexp( content, '[-\d\.]+(?=-\d)', 'match' ) ;
data = str2double( matches );
% With above commands, I extract the specific numeric values in the attached file. But I need to limit this search from %beginning to "START OF RMS MAP" (line 32, but this number is variable) not all lines. How can I set the this last line while I'm using regexp.
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Cedric
Cedric 2015-9-14
编辑：Cedric 2015-9-15
Stephen's approach is the best, but if you can't figure out how to adapt it to your case and need to work out a solution quickly, you can always do
content = strsplit( fileread( 'trial.txt' ), 'START OF RMS MAP' ) ;
data = str2double( regexp( content{1}, '[-\d\.]+(?=-\d)', 'match' )) ;
PS: if this question is still about extracting only the numbers mentioned in this thread, you should have made it clear initially, because Stephen wrote a complete solution for extracting all numbers within the section that you mention.

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Stephen23
Stephen23 2015-9-14
It is often faster and easier just to read in all of the data from a file, then then use simple indexing to pick the bits that you need. This will read the first part of the file:
opt = {'CollectOutput',true};
fid = fopen('trial.txt','rt');
C_date = textscan(fid,'%f%f%f%f%f%f%*s',1,'HeaderLines',5,opt{:});
for k = 1:4
C_lat(k,:) = textscan(fid,'%f%f%f%f%f%*s',1,'Delimiter','- ',opt{:});
C_map(k,:) = textscan(fid,repmat('%f',1,16),5,opt{:});
end
fclose(fid);
  2 个评论
sermet
sermet 2015-9-14
when I use celldisp(C_lat) to see the numbers, there are all empty arrays of C_lat have been seen. How can I convert to doubles for C_lat?
Stephen23
Stephen23 2015-9-14
编辑：Stephen23 2015-9-14
I do not understand your request. When I run that code using your file I get these outputs:
>> celldisp(C_lat)
C_lat{1} =
87.5000 180.0000 180.0000 5.0000 450.0000
C_lat{2} =
85 180 180 5 450
C_lat{3} =
82.5000 180.0000 180.0000 5.0000 450.0000
C_lat{4} =
80 180 180 5 450
And similarly for C_map:
>> celldisp(C_map)
C_map{1} =
259 260 262 263 264 265 265 266 266 266 266 266 265 264 262 261
259 257 254 252 249 245 242 239 235 231 228 224 221 217 214 211
208 206 203 201 200 198 198 197 197 197 197 198 198 200 201 203
205 207 209 211 214 216 219 221 224 226 229 232 234 237 239 242
244 246 248 250 252 254 256 257 259 NaN NaN NaN NaN NaN NaN NaN
C_map{2} =
266 268 271 274 276 279 281 283 285 287 288 289 289 288 287 285
282 278 273 268 262 255 248 240 232 224 216 208 200 193 186 179
....
You can access the elements of a cell array using indexing:
http://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

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