Error using readtable: Must be a scalar logical value

I am attempting to read in 19 different measurement files. The third line is the code that throws the error in the readtable function.

for i=1:18   
    if length(num2str(deg(1,i))) == 1
        Tnow = table2array(readtable([D0,filenametxt,' 0',num2str(deg(1,i)),' Deg.txt'],'MultipleDelimsAsOne',1));

I get the error:

Error using readtable (line 198)

Must be a scalar logical value.

Below is the code for the readtable function. The throw(ME) code is line 198 that is referred too by the error. I read the above documentation for the function, and nothing defines or describes what ME is or how to define it.

try
    if any(strcmpi(names,"Format"))
        t = matlab.io.internal.legacyReadtable(filename,varargin);
    else
        func = matlab.io.internal.functions.FunctionStore.getFunctionByName('readtable');
        C = onCleanup(@()func.WorkSheet.clear());
        t = func.validateAndExecute(filename,varargin{:});
    end
catch ME
    throw(ME)
end

I am thinking the error results from how I am defining the inputs of the readtable function, but I'm not sure what other syntax to change. Any help is appreciated.

[dpb]

Tnow = table2array(readtable([D0,filenametxt,' 0',num2str(deg(1,i)),' Deg.txt'],'MultipleDelimsAsOne',1));

Don't need to try to play "MATLAB golf" (see how few lines one can write something in as a challenge) -- get one thing to work at a time...plus, once you have a table, there's no reason to make arrays of the same data--use the table variables directly.

Tnow=readtable([D0,filenametxt,' 0',num2str(deg(1,i)),' Deg.txt'],'MultipleDelimsAsOne',1);

Now, we don't know what any of the variables inside there are, but first we need to see if you've built a real qualified file name that makes sense, so show us all those missing pieces.

Then, while that is a doable way to create a file name, it's certainly not the neatest way to do so; in all likelihood you could use a call to dir() with a suitable wild card pattern and get a list of files can use directly.

[Paul Bickel]

Thanks dpb.

Native file names are Master w EQ 00 deg.txt, Master w EQ 05 deg.txt, etc up to Master w EQ 90 deg.txt. The data in the files are three columns: Frequency, Level, and Phase. There are multiple spaces in the text file to delimit between columns when the file is output from our measurement system.

I did get it to work by just omitting the 'MultipleDelimsAsOne' because there were not multiple types of delimiters between values.

readtable([D0,filenametxt,' 0',num2str(deg(1,i)),' Deg.txt'])

Answer 1

[dpb]

"file names are Master w EQ 00 deg.txt, Master w EQ 05 deg.txt, etc up to Master w EQ 90 deg.txt."

d=dir('Master*deg.txt');
for i=1:numel(d)
  tData=readtable(d(i).name);
  % do whatever with each table in turn here
  ...
end

The 'MultipleDelimsAsOne' problem probably was related to the note/requirement:. "You must also specify the Delimiter option". although I've not tested that behavior.