How to transform 'double' into 'cell array'?

My code:

B = zeros(height(A),1);
col_names = A.Properties.VariableNames; % Replicate header names 
for k = 1:height(A)
    % the following 'cellfun' compares each column to the values in A.L{k},
    % and returns a cell array of the result for each of them, then
    % 'cell2mat' converts it to logical array, and 'any' combines the
    % results for all elements in A.L{k} to one logical vector:
    C = any(cell2mat(...
        cellfun(@(x) strcmp(col_names,x),A.L{k},...
        'UniformOutput', false).'),1);
    % then a logical indexing is used to define the columns for summation:
    B(k) = sum(A{k,C});
end

generates the following error message. Thanks for helping out!

Error using cellfun
Input #2 expected to be a cell array, was double instead.

This is how table 'A' looks like:

[Beder]

Not sure about it - without trying - maybe you need so replace sum(A{k,C}) by sum(A(k,C))?

[John]

thanks, @Peter Albrecht. I tried this one, but the following error occurs: Undefined function 'sum' for input arguments of type 'table'.

Answer 1

[Guillaume]

Clearly from the error message, one of the rows of A has a double matrix instead of a cell array in column L. The simplest way to find out:

dbstop if error

run your code and look at the value of k when it breaks into the debugger. This is the offending row.

edit: the following will give you all the offending rows:

find(cellfun(@(r) ~iscell(r), A.L))