MATLAB: How to adjust the “isnan” to make it work for cell

cellcell arraycell arraysforfor looplooploops

Hi I have the below for loop. I would like to replace the NaN data output with 0.07. I keep getting the below error message. Could anyone please advise me how to stop the error message? Thank you.
for i=1:size(A,2)%number of columns
x{i} = interp1(y3, x3, A(:,i), 'linear');
k=1:1;
temp=x(k,:);
temp(isnan(temp))=0.07;
x(k,:)=temp;
 fid=fopen(['result_' num2str(1) '.txt'],'w');
 fprintf(fid,'%f\n',x); 
 fclose(fid);
end
The error message:
Undefined function 'isnan' for input arguments of type 'cell'.
Error in InterpolaeMFJavadCompleted (line 24)
temp(isnan(temp))=0.07;

Best Answer

Don't waste your time with cell arrays and cell2mat and the like, you don't need them. Just use a numeric variable:
N = size(A,2) %number of columns
%C = cell(1,N);
for k = 1:N
    tmp = interp1(y3, x3, A(:,k), 'linear');
    tmp(isnan(tmp))=0.07;
    %C{k} = tmp;
    fnm = sprintf('result_%d.txt',k);
    [fid,msg] = fopen(fnm,'wt');
    assert(fid>=3,msg)
    fprintf(fid,'%f\n',tmp); 
    fclose(fid);
end
I also made some other small changes to make your code more robust.
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