plot - MatLab - Automated plotting of differently sized segments of a text file -


i have text file 2 columns containing space-delimited numeric data. data divided segments, each of them contains variable number of rows , beginning of next segment indicated single row of nan (so data below comprised of 4 segments):

5.1 [space] 0.0
9.2 [space] 1.4
3.7 [space] 0.6
... [space] ...
... [space] ...
... [space] ...
nan [space] nan
9.7 [space] 6.3
1.4 [space] 1.0
... [space] ...
... [space] ...
nan [space] nan
8.7 [space] 0.0
5.1 [space] 7.4
3.7 [space] 2.6
... [space] ...
nan [space] nan
1.7 [space] 8.4
... [space] ...

and forth...

now i'd generate plot displaying curve each data segment in file (by plotting each segments 1st column against 2nd column).
know how if

  • the number of rows in each segment same ,

  • the number of segments known.

how can done efficiently when there's variable segment size , unknown number of segments?

i generated random data similar file. text file 1 described can loaded (load correctly handles nans):

data = load(filename, '-ascii');

i know code not perfect, works arbitrary number of segments separated nans.

% here generate random points test code npoints                     = 100;  data                        = rand(npoints,2); % insert nans in both columns data( data(:,1)>0.9, : )    = nan;  % magic idxnan                          = find( isnan( data(:,1) ) ); idxnearnans                     = [ idxnan-1 idxnan+1 ]'; segmentstartend                 = reshape( [1;idxnearnans(:);npoints] , 2, [] )'; segmentsok                      = ( segmentstartend(:,2) - segmentstartend(:,1) ) >= 0; segmentstartend( ~segmentsok,:) = [];  % segmentstartend contain start , end rows of segments numberofsegments = size(segmentstartend,1); fprintf('nans positions: %s\n', sprintf('%g ',idxnan)); fprintf('%d segments found\n', numberofsegments);  % plot data figure; hold all; k=1:numberofsegments     segmentstart    = segmentstartend(k,1);     segmentend      = segmentstartend(k,2);     fprintf('segment #%04d: rows %04d %04d\n', k, segmentstart,segmentend);     plot( data(segmentstart:segmentend,1) , data(segmentstart:segmentend,2) ); end

let me know if need explanations.


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