I am getting this error

 j = 1:length(fileNames)
    thisFile = fileNames(j).name;
    file_info = split(extractBefore(thisFile,'.txt'), "_");
    block = file_info{2,1};
    strainrate = file_info{3,1};
    trial = file_info{5,1};
    trialtxt = char(trial);
    trialnum = trialtxt(2)-'0';
    sheet = sprintf('%s_%s',char(block),char(strainrate));
if trialnum == 1
    fig = fig+1;
else
    fig = fig;
end


  % for i = 1:6
    i=1;
        % Average Initial Length
        dimensions(i,1) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('B%d:B%d',cell,cell));
        % Length After Test
     
    area = (table2array(dimensions(:,3))./1000).*(table2array(dimensions(:,4))./1000);
    
    readFile = importdata(fileNames(j).name); 
    fileData = readFile.data;
    compressionDisp = fileData(:,1);
    load = fileData(:,2);
    time = fileData(:,3);
    k = find(compressionDisp==0);
    

error:

   Dot indexing is not supported for variables of this type.

Error in untitled2 (line 41)
    fileData = readFile(j).data;

The readFile.data is working in b but not in a version how can i make it work in a version as well.

Answer 1

[Cris LaPierre]

You use importdata to create readFile, which returns data from the file as a matrix, multidimensional array, or scalar structure array, depending on the characteristics of the file. Perhaps the characteristics of your file are resulting in it returning a matrix instead of a structure?

You can read more about it here.

[Manav Divekar]

can you tell me how can i do that in this

[Cris LaPierre]

If you can share more information. What type of files are you loading? How many files are there? How do you create filename? Can you share your files by attaching them to you pose using the papercilp icon?

[Manav Divekar]

i am using txt files, there are more than just 3 files but cant share all as it will be too big

and this is my full code.

fileNames = dir('*.txt');
    cell = 6;
    cell2 = 8;
    fig = 1;
for j = 1:length(fileNames)
    thisFile = fileNames(j).name;
    file_info = split(extractBefore(thisFile,'.txt'), "_");
    block = file_info{2,1};
    strainrate = file_info{3,1};
    trial = file_info{5,1};
    trialtxt = char(trial);
    trialnum = trialtxt(2)-'0';
    sheet = sprintf('%s_%s',char(block),char(strainrate));
if trialnum == 1
    fig = fig+1;
else
    fig = fig;
end


  % for i = 1:6
    i=1;
        % Average Initial Length
        dimensions(i,1) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('B%d:B%d',cell,cell));
        % Length After Test
        dimensions(i,2) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('B%d:B%d',cell2,cell2));
        % Average Initial Width
        dimensions(i,3) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('C%d:C%d',cell,cell));
        % Average Initial Thickness
        dimensions(i,4) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('D%d:D%d',cell,cell)); 
				 % Width After Test
        dimensions(i,5) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('C%d:C%d',cell2,cell2));
				 % Thickness After Test
        dimensions(i,6) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('D%d:D%d',cell2,cell2));
   % end
    area = (table2array(dimensions(:,3))./1000).*(table2array(dimensions(:,4))./1000);
    readFile = importdata(fileNames(j).name); 
    fileData = readFile.data;
    compressionDisp = fileData(:,1);
    load = fileData(:,2);
    time = fileData(:,3);
    k = find(compressionDisp==0);
    disp = compressionDisp(k(end):end);
    newload = load(k(end):end);
    figure(fig)
    hold on
    plot(disp,newload)
    xlabel('Compression displacement (mm)')
    ylabel('Load (N)')
    title(sprintf('Load-Displacement of %s',sheet))
    xlim([-5 0])
    ylim([-10000 0])


    stress = newload/area;
    finalL = table2array(dimensions(:,2));
    initialL = table2array(dimensions(:,1));
    strain = finalL-initialL/initialL;
    emod = abs(stress/strain);
    avgEmod = mean(emod);
    avgEmodMPA = avgEmod/1E+06;
    cell = cell + 8*trialnum;
    cell2 = cell2 + 8*trialnum;
    
    eModTable{j,1} = block(1);
    eModTable{j,2} = block(2);
    eModTable{j,3} = strainrate;
    eModTable{j,4} = trialnum;
    eModTable{j,5} = avgEmodMPA;

end

[Cris LaPierre]

With the files you have shared here, your code runs. Is there a different file that you are testing with that, when loaded, causes this error?

Note that the file names of the attached text files do not match the expected naming convention of your code. I had to append one more underscore at the start to get the code to run.

fileNames = dir('*.txt');
    cell = 6;
    cell2 = 8;
    fig = 1;
for j = 1:length(fileNames)
    thisFile = fileNames(j).name;
    file_info = split(extractBefore(thisFile,'.txt'), "_");
    block = file_info{2,1};
    strainrate = file_info{3,1};
    trial = file_info{5,1};
    trialtxt = char(trial);
    trialnum = trialtxt(2)-'0';
    sheet = sprintf('%s_%s',char(block),char(strainrate));
if trialnum == 1
    fig = fig+1;
else
    fig = fig;
end


  % for i = 1:6
    i=1;
        % Average Initial Length
        dimensions(i,1) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('B%d:B%d',cell,cell));
        % Length After Test
        dimensions(i,2) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('B%d:B%d',cell2,cell2));
        % Average Initial Width
        dimensions(i,3) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('C%d:C%d',cell,cell));
        % Average Initial Thickness
        dimensions(i,4) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('D%d:D%d',cell,cell)); 
				 % Width After Test
        dimensions(i,5) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('C%d:C%d',cell2,cell2));
				 % Thickness After Test
        dimensions(i,6) = readtable('BMES 442 642 Lab 2 Geometric Measurements(2).xlsx','Sheet',sheet,'Range',sprintf('D%d:D%d',cell2,cell2));
   % end
    area = (table2array(dimensions(:,3))./1000).*(table2array(dimensions(:,4))./1000);
    readFile = importdata(fileNames(j).name); 
    fileData = readFile.data;
    compressionDisp = fileData(:,1);
    load = fileData(:,2);
    time = fileData(:,3);
    k = find(compressionDisp==0);
    disp = compressionDisp(k(end):end);
    newload = load(k(end):end);
    figure(fig)
    hold on
    plot(disp,newload)
    xlabel('Compression displacement (mm)')
    ylabel('Load (N)')
    title(sprintf('Load-Displacement of %s',sheet))
    xlim([-5 0])
    ylim([-10000 0])


    stress = newload/area;
    finalL = table2array(dimensions(:,2));
    initialL = table2array(dimensions(:,1));
    strain = finalL-initialL/initialL;
    emod = abs(stress/strain);
    avgEmod = mean(emod);
    avgEmodMPA = avgEmod/1E+06;
    cell = cell + 8*trialnum;
    cell2 = cell2 + 8*trialnum;
    
    eModTable{j,1} = block(1);
    eModTable{j,2} = block(2);
    eModTable{j,3} = strainrate;
    eModTable{j,4} = trialnum;
    eModTable{j,5} = avgEmodMPA;

end

Answer 2

[Manav Divekar]

can youcheck with these?

[Cris LaPierre]

Can't you?

[Manav Divekar]

the code is not working for me, it is throwing this error

Dot indexing is not supported for variables of this type.

Error in untitled2 (line 38)

fileData = readFile.data;

[Cris LaPierre]

I get no error for any of your files.

Somehow your version of readFile is different. Your code runs, so try to explore that. Clear your workspace (clear) and rerun your code. If you get the error still, run the following code in your command window and share the results.

whos readFile
fileNames(j).name

Attach the file identified by the 2nd line.

Note that, no matter what, your code is always loading the last file loaded. The index j is your for loop loop counter, which has already run, so j is equal to length(fileNames) at this point.

[Manav Divekar]

ok got it i will try that