how to solve this error Operands to the || and && operators must be convertible to logical scalar values?

I am getting this error

Error using matlab.io.datastore.ImageDatastore/countEachLabel (line 27)
Operands to the || and && operators must be convertible to logical scalar values.

when i try to count each label in the folder I have loaded. Until 2 days ago it worked, now I don't understand what is wrong, can you help me please?

This is my code:

 imds = imageDatastore('NuoveCategorie_agg2',...

 'IncludeSubfolders',true, 'LabelSource','foldernames');    

 %%Display Class Names and Counts

 tbl = countEachLabel(imds)                                             
 categories = tbl.Label;

and this is the code where there is the error:

function tbl = countEachLabel(imds)

try

      if isempty(imds.Labels)
          tbl = table;
          return;
      end
      [u, c] = groupAndCountLabels(imds);
      tbl = table(u, c, 'VariableNames', {'Label', 'Count'});
   catch e
      throw(e)    *This is line 27*

   end

   end

[Matt J]

Line 27 isn't really where the error is coming from, only where it is being thrown from. You should turn on the debugger

 >>dbstop if caught error

and then re-run the code to find its actual location. Most likely the code itself hasn't "stopped working", but rather your input data has different/unexpected characteristics from what you were passing in previously.

[Paola Perrone]

It says to me:

matlab.io.datastore.ImageDatastore.countEachLabel
The class matlab.io.datastore.ImageDatastore has no Constant property or Static method named
'countEachLabel'. 

What I can do to fix the problem?

[Walter Roberson]

That routine was added in R2016a; which MATLAB release are you using? imageDatastore itself was added in R2015b, so there was one release where you could have one without the other.

[Paola Perrone]

I'm using R2018a

[Walter Roberson]

It works for me in R2018a when I use the example https://www.mathworks.com/help/matlab/ref/datastore.counteachlabel.html#bu7fdr4-1 . Could you try that to see whether that gives you a problem as well?

[Paola Perrone]

yes It says after

 T = countEachLabel(imds)

Caught-error breakpoint was hit in findgroups>localgrp2idx at line 222. The error was:

Operands to the and && operators must be convertible to logical scalar values.

222 if ~isempty(glevels) && isundefined(glevels(end)) % undefineds are sorted to end

[Walter Roberson]

Try

restoredefaultpath

[Paola Perrone]

Now I have this error:

In an assignment A(:) = B, the number of elements in A and B must be the same.

Error in tabular/disp (line 135) varStr(ismissing(varStr)) = miss;

Error in tabular/display (line 44) disp(obj);

What I can do to fix it?

[Walter Roberson]

Please check

which string
which char
which missing

You should see something like

string is a built-in method  % string constructor
built-in (/Applications/MATLAB_R2018a.app/toolbox/matlab/strfun/char)
/Applications/MATLAB_R2018a.app/toolbox/matlab/datatypes/missing.m  % missing constructor

I suspect that you have your own string.m or missing.m

[Paola Perrone]

thanks, I have solved that problem. Sometimes it gives to me this error:

Error using trainNetwork (line 154) Unexpected image size: All images must have the same size.

but they are of the same size surely

[Walter Roberson]

What turned out to be the problem earlier?

You can check the image sizes by making small changes to what I posted at https://www.mathworks.com/matlabcentral/answers/385472-error-in-image-size#answer_307796

[Paola Perrone]

For the first one I have disinstalled and reinstalled matlab and I fixed it. For the second one, I try that code. Thank you so much