making matrix with text file information

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Anjali Mishra
Anjali Mishra on 13 Jun 2022
Commented: Stephen23 on 14 Jun 2022
I have following data:
2022-04-1113:38:14.002 0
G4 20
G9 39
G17 41
G20 42
G27 17
G28 41
G32 35
G4 20
G9 39
G17 41
G20 42
G27 17
G28 41
G32 35
2022-04-1113:38:15.000 0
G4 18
G9 42
G17 42
G20 38
G28 42
G30 43
G4 18
G9 42
G17 42
G20 38
G28 42
G30 43
I want to convert it to following:
G4 G9 G17 G20 G27 G28 G32 G30
2022-04-1113:38:14.002 20 39 41 42 17 41 35
2022-04-1113:38:15.000 18 42 42 38 42 43
1) Taking timestamp from rows and makes it row "a new" of matrix
2) in that new row, it looks for next lines until another timestamp found
2a) If no timestamp found, it makes a new colum for each unique values of G* and populates it with the value of signal strength
3) When new timestamp found it appends the matrix
4) The number of G* are not same for each time stamp
5) The value of G* are also vary with timestamp
Do you have any suggestion please?
  5 Comments
DGM
DGM on 14 Jun 2022
Is the output simply to be a cell array, or is it text printed to a file or something?

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Accepted Answer

DGM
DGM on 14 Jun 2022
Edited: DGM on 14 Jun 2022
EDIT: updated to handle new file encoding and empty blocks
I'm just going to throw this out there. I'm sure it's entirely overcomplicated, but I guess it does a thing. I'm sure there are tools that exist to make this kind of sorting easier, but I'm just going to opt to be a caveman today.
% open the file and read the whole thing
fid = fopen('TCM_Sat_SS.txt', 'r');
alllines = fread(fid,inf,'uint16=>char')';
fclose(fid);
alllines = split(alllines,newline);
% strip empty lines
alllines = alllines(~cellfun(@isempty,alllines));
% find timestamps
tslines = regexp(alllines,'^[0-9]{4}-[0-9]{2}-[0-9]{2,}.*$','match');
tslines = ~cellfun(@isempty,tslines);
tsidx = find(tslines);
% break the data into blocks
nblocks = numel(tsidx);
timestamps = cell(nblocks,1);
datablocks = cell(nblocks,1);
blockisempty = false(nblocks);
for k = 1:nblocks
timestamps(k) = alllines(tsidx(k));
if k ~= nblocks
blockend = tsidx(k+1)-1;
else
blockend = size(alllines,1);
end
thisblock = unique(alllines(tsidx(k)+1:blockend));
bdata = regexp(thisblock,'^G([0-9]+)\s+([0-9]+).*$','tokens');
bdata = cellfun(@(x) str2double(x{:}),bdata,'uniform',false);
if ~isempty(bdata)
datablocks{k} = sortrows(cell2mat(bdata),1,'ascend');
else
blockisempty(k) = true;
end
end
% get unique row header list
uqheaders = vertcat(datablocks{:});
uqheaders = unique(uqheaders(:,1));
% build the "table" column header
colheader = split(sprintf('G%d\n',uqheaders));
colheader = [{''} colheader(1:end-1)'];
% build output array
outputarray = cell(nblocks,numel(colheader));
outputarray = [colheader; outputarray];
outputarray(2:end,1) = timestamps;
for b = 1:nblocks
if ~blockisempty(b)
thisblock = datablocks{b};
idx = find(ismember(uqheaders,thisblock(:,1)))+1;
thisblock = num2cell(thisblock(:,2));
[outputarray{b+1,idx}] = thisblock{:};
end
end
outputarray
outputarray = 3705×12 cell array
{0×0 char } {'G1' } {'G2' } {'G4' } {'G9'} {'G10' } {'G13' } {'G17'} {'G20'} {'G27' } {'G28'} {'G32'} {'2022-04-1113:38:15.000→←'} {0×0 double} {0×0 double} {[ 18]} {[42]} {0×0 double} {0×0 double} {[ 42]} {[ 38]} {0×0 double} {[ 42]} {[ 43]} {'2022-04-1113:38:16.000→←'} {0×0 double} {0×0 double} {[ 18]} {[39]} {0×0 double} {0×0 double} {[ 42]} {[ 43]} {0×0 double} {[ 42]} {[ 46]} {'2022-04-1113:38:17.000→←'} {0×0 double} {0×0 double} {[ 17]} {[39]} {0×0 double} {[ 19]} {[ 42]} {[ 39]} {0×0 double} {[ 42]} {[ 33]} {'2022-04-1113:38:18.000→←'} {0×0 double} {0×0 double} {[ 15]} {[40]} {0×0 double} {[ 16]} {[ 42]} {[ 40]} {0×0 double} {[ 42]} {[ 38]} {'2022-04-1113:38:19.000→←'} {0×0 double} {0×0 double} {0×0 double} {[42]} {0×0 double} {[ 14]} {[ 42]} {[ 35]} {0×0 double} {[ 42]} {[ 38]} {'2022-04-1113:38:20.000→←'} {0×0 double} {0×0 double} {0×0 double} {[42]} {0×0 double} {[ 11]} {[ 41]} {[ 45]} {0×0 double} {[ 41]} {[ 42]} {'2022-04-1113:38:21.000→←'} {0×0 double} {0×0 double} {[ 39]} {[40]} {0×0 double} {0×0 double} {[ 41]} {[ 39]} {0×0 double} {[ 41]} {[ 36]} {'2022-04-1113:38:22.005→←'} {[ 41]} {0×0 double} {[ 38]} {[40]} {0×0 double} {0×0 double} {[ 41]} {[ 35]} {[ 41]} {[ 41]} {[ 42]} {'2022-04-1113:38:23.000→←'} {0×0 double} {0×0 double} {[ 29]} {[40]} {0×0 double} {0×0 double} {[ 41]} {[ 44]} {[ 40]} {[ 41]} {[ 41]} {'2022-04-1113:38:24.006→←'} {[ 42]} {0×0 double} {[ 45]} {[43]} {0×0 double} {0×0 double} {[ 41]} {[ 42]} {[ 42]} {[ 41]} {[ 43]} {'2022-04-1112:10:55.720→←'} {0×0 double} {0×0 double} {[ 37]} {[40]} {0×0 double} {0×0 double} {[ 41]} {[ 35]} {[ 41]} {[ 41]} {[ 42]} {'2022-04-1112:10:56.720→←'} {[ 39]} {0×0 double} {[ 44]} {[45]} {0×0 double} {0×0 double} {[ 41]} {[ 37]} {[ 34]} {[ 41]} {[ 40]} {'2022-04-1112:10:58.000→←'} {[ 39]} {0×0 double} {[ 32]} {[46]} {0×0 double} {0×0 double} {[ 41]} {[ 39]} {[ 37]} {[ 41]} {[ 43]} {'2022-04-1112:10:59.000→←'} {[ 45]} {0×0 double} {[ 38]} {[37]} {0×0 double} {0×0 double} {[ 41]} {[ 43]} {[ 38]} {[ 41]} {[ 38]} {'2022-04-1112:11:00.000→←'} {[ 38]} {0×0 double} {[ 36]} {[33]} {0×0 double} {0×0 double} {[ 41]} {[ 37]} {[ 42]} {[ 41]} {[ 30]}
  1 Comment
Stephen23
Stephen23 on 14 Jun 2022
Anjali Mishra's incorrectly posted "Answers" moved here and code formatted correctly:
Cell array output is most useful.
Code errors out at this point:
bdata = cellfun(@(x) str2double(x{:}),bdata,'uniform',false);
It says:
Error using cellfun
Not enough input arguments.
Error in untitled5 (line 29)
bdata = cellfun(@(x) str2double(x{:},bdata,'uniform',false));
When corrected as below:
bdata = cellfun(@(x) str2double(x{:}),bdata,'uniform',false);
The error is now:
Error using matlab.internal.math.sortrowsParseInputs
Column sorting vector must contain integers with absolute value between 1 and the number of columns in the first argument.
Error in sortrows (line 64)
[col, nanflag, compareflag] = matlab.internal.math.sortrowsParseInputs(ismatrix(A),size(A,2),A,varargin{:});
Error in untitled5 (line 30)
datablocks{k} = sortrows(cell2mat(bdata),1,'ascend');
bdata and thisblock are both empty cells when code reaches this point.
It was some junk at the end of file which was causing teh two errors mentioned. The logic works well. Thank you very much.

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