Matlab: Text files, Read header lines and Cell references

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Matlab User 2016-8-16

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编辑： Matlab User 2016-8-31

Hi,

I am trying to cell reference header lines from the code below. I was a able to read header information line by line and printed tLine into command window. my problem is that when i cell referenced tLine(6) in the command window even though the tLine has been outputted to command window.

I got error message: >> tLine{6} Cell contents reference from a non-cell array object.

any help on how i can fix this error message?

Thanks,

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Matlab User 2016-8-16

编辑：Matlab User 2016-8-16

Deeply sorry, I value your time and dedication here.

Benjamin 2016-8-16

@Stephen Cobeldick, this user is obviously new to MATLAB Answers. Maybe we shouldn't yell at them and make them afraid to ask for help.

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采纳的回答

Benjamin 2016-8-16

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https://ww2.mathworks.cn/matlabcentral/answers/299702-matlab-text-files-read-header-lines-and-cell-references#answer_231870

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The problem is that you're trying to referencing tLine as a cell array, but it's a string since you use fgetl, which returns a string:

    function tline = fgetl(fid)
      %FGETL Read line from file, discard newline character.
      %   TLINE = FGETL(FID) returns the next line of a file associated with file
      %   identifier FID as a MATLAB string.

When you get C from textscan, you get your cell array:

      %function [varargout] = textscan(varargin)
      %TEXTSCAN Read formatted data from text file or string.
      %   C = TEXTSCAN(FID,'FORMAT') reads data from an open text file identified
      %   by FID into cell array C.

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Benjamin 2016-8-16

在 MATLAB Online 中打开

okay, this will be the end of my help because you're continuing to add on more and more conditions with every comment. this started out as a question of how to reference cell arrays, not parsing your whole text file and putting values into a GUI which i don't have any example code from.

anyway, this will put all the "headers" that you desire into a cell array 'textForGUI' and will still get you your cell array 'C' with the data in it. best of luck modifying it to suit your needs, and please mark my answer as correct since i did more than solve your original question :)

fid= fopen([FilesToRead, MultipleFiles]);
textForGUI = cell(1);
while true
    tLine = fgetl(fid);
    headerCells = strsplit(tLine,' ');
    if length(headerCells) > 1
        if ~isempty(headerCells{2})
            if ~strcmpi(headerCells{2},'!user') && ~strcmpi(headerCells{2},'data')
                textForGUI(end+1) = headerCells(2);
            else
                break
            end
        end
    end
end
textForGUI = textForGUI(2:end);
Block=0;
while true
    tLine = fgetl(fid);
    if ~ischar(tLine) 
       break;
    end
    if ~isempty(strfind(tLine,'data'))  
      Block=Block+1;   
     fprintf('\n\nBlock: %s\n\n', num2str(Block));  
     formatSpec = '%f %f %f %f %f';       
     C = textscan(fid,formatSpec,24,'CommentStyle','data','Delimiter','\t');
     %here I got some calculations and plots
    end
end

Benjamin 2016-8-17

Type dbstop if error into the command window. When it errors, it will go into the editor and you can see what the value of tLine is. It is clearly not a character as it should be.

Guillaume 2016-8-19

@Matlab User, to solve your problem:

step 1: accept Benjamin's answer
step 2: start a new question about (and only about) your new problem. Make sure that you use the {} Code button to format the code in your question properly.

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