How set table column to modified data?

I am performing same set of operations for all the columns in a table. How do I use a for loop over all the columns for this? I want to covert the string entries to double and set the transformed data as new column entries of the existing table.

Here is my sample file attached. The set of operation is as follows.

for col = 1:7
  loadfile = load('sample.mat');
  rawTableData = loadfile.ans;
  thisColumn = rawTableData(:, col);
  % remove unit name, decimal places, just keep the value
  data = thisColumn.Variables;
  strData = string(data);
  expression = '(-?\d+(\.\d*)?)|(-?\.\d+)';
  regexData = regexp(strData, expression, 'match', 'once');
  %% set thisColumn to be regexData
end

How do I do it?

Answer 1

[Karim]

See below, you can first extract the column names from the table. And use these as index during the loop.

loadfile = load(websave('myFile', "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1094055/sample.mat"));

% get the columns of the table
rawTableData = loadfile.ans;
MyCol = rawTableData.Properties.VariableNames;

for col = 1:numel(MyCol)
  % remove unit name, decimal places, just keep the value
  strData = string(rawTableData.(MyCol{col}));
  expression = '(-?\d+(\.\d*)?)|(-?\.\d+)';
  regexData = regexp(strData, expression, 'match', 'once');
  %% set thisColumn to be regexData
  rawTableData.(MyCol{col}) = str2double(regexData);
end

rawTableData

rawTableData = 100×7 table
    intensityofcost1    intensityofcost2    intensityofcost3    rewardconcentration1    rewardconcentration2    rewardconcentration3    rewardconcentration4
    ________________    ________________    ________________    ____________________    ____________________    ____________________    ____________________

           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         
           15                  40                 240                    9                       5                       2                      0.5         

[Struggling in MATLAB]

Thank you very much!