How to Fix Undefined function ‘eq’ for input arguments of type ‘cell’ error

Diagram of How to Fix Undefined function 'eq' for input arguments of type 'cell' error


“Undefined function ‘eq’ for input arguments of type ‘cell'” error usually occurs in MATLAB when you trying to “compare cell arrays using equality operations like ==”. In MATLAB, cell arrays are containers that can hold various data types, and they cannot be directly compared using ==.

Here are some solutions to address this issue, depending on what you’re trying to accomplish:

Solution 1: Compare Elements Inside Cells

To compare the contents inside the cells, you can use the isequal() function or manually loop through the elements to compare them.

% Using isequal
result = isequal(cellArray1{1}, cellArray2{1});

% Using a loop for multiple elements
for i = 1:length(cellArray1)
  result(i) = isequal(cellArray1{i}, cellArray2{i});

Solution 2: Compare Cell Arrays as a Whole

To compare entire cell arrays, you can use isequal():

result = isequal(cellArray1, cellArray2);

Solution 3: Convert Cells to Matrices or Arrays

If the cell arrays contain numerical data, you can convert them to matrices or arrays and then perform the comparison.

array1 = cell2mat(cellArray1);
array2 = cell2mat(cellArray2);

result = array1 == array2;

Solution 4: Use Cell Functions

MATLAB provides cell-specific functions to perform operations on cell arrays. For example, cellfun can apply a function to each element of a cell array.

result = cellfun(@isequal, cellArray1, cellArray2);

That’s it!

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