MATLAB: How to extract the events which have more than 3 consecutive rows

sequence

Hi,

I have array of data as follows;

idx3=0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 2 1 0 0 1 0 1 1 1 1 2 2 1 1 1 0 0 1 2 2 2 1 0 0 1 1 2 2 2 1 2 2 0 1 1 2 2 2 0 2

I want to find number of events which "2" comes for more or equal 3 consecutive rows. In my data set there are 3 events which show "2" in more than 3 (row # 83-85, 91-93 and 10-102).

How can i find it in matlab?

Thanks

Best Answer

r=3; how many repeats
mask = idx3.' == 2;  %row
starts = strfind([false mask], [0 ones(1,r)];
stops = strfind([mask, false], [ones(1,r) 0]) + r-1;

Related Solutions

MATLAB: Grouping continuous nonzero in a row vector

Here is one solution..

 wrap       = [0, A, 0] ;
 temp       = diff( wrap ~= 0 ) ;
 blockStart = find( temp == 1 ) + 1 ;
 blockEnd   = find( temp == -1 ) ;
 blocks     = arrayfun( @(bId) wrap(blockStart(bId):blockEnd(bId)), ...
                        1:numel(blockStart), 'UniformOutput', false ) ;

With that, you get

 >> blocks{1}
 ans =
     3     2     5     2     4     1     5
 >> blocks{2}
 ans =
     1     2     5
 >> blocks{3}
 ans =
     1     1     2     6     3     1

Another solution would be to compute the start and size of clusters of 0's, eliminate the latter from A, and MAT2CELL what remains using proper boundaries based on the aforementioned start and size information.

MATLAB: How to use for loop

finally I somehow I did

 O3_data_folder = 'C:\Users\Myself\Dropbox\prithvi_project\o-3';
cd(O3_data_folder);
%%open files in the data folder
temp = dir();
O3filenames = [];
%%%for the program to not read .files
flag_1 = 0 ;
for i = 1:numel(temp);
if (strncmp(temp(i).name, '.', 1) == 1);
flag_1 = flag_1 +1 ;
else
O3filenames{i-flag_1} = temp(i).name ;
end
end
  for file = 1:size(O3filenames,2);
fname = char(O3filenames(file));
fid= fopen(fname(file));   % creating file id
content = fileread(fname) ;
% - Remove first space on all data rows.
content = regexprep( content, '(?<=[\r\n]) ', '' ) ;
% - Split by "lat = ..." separator.
blocks = regexp( content, '\s+lat[^\r\n]+', 'split' ) ;
% - Extract header from block 1.
.
.
.end

Best Answer

Related Solutions

MATLAB: Grouping continuous nonzero in a row vector

MATLAB: How to use for loop

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