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How to let Matlab know 'NaN' should be treated as NaN?

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John
John 2017-1-7
I have imported the following .xlsx file into Matlab:
My code:
U_sum24t = zeros(height(Z_24TimeSteps),1);
col_names24tU = Z_24TimeSteps.Properties.VariableNames;
for k = 1:height(Z_24TimeSteps)
col_to_sum24tU = any(cell2mat(...
cellfun(@(x) strcmp(col_names24tU,x),Z_24TimeSteps.U{k},...
'UniformOutput', false).'),1);
U_sum24t(k) = sum(Z_24TimeSteps{k,col_to_sum24tU});
end
Following error message occurs:
Undefined function 'sum' for input arguments of type 'cell'. I want to make Matlab treat all 'NaN' as NaN, so I can execute calculations. What I tried already: Replace NaN in Excel with blanks, then in Matlab > import data > "replace blanks with NaN" > not working and still displaying string format

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