Writing data in file and naming file with a string value

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Hi..

My simulations are finding errors for 4 cases in a loop as shown below. I am writing those errors in data file.

Problem is naming of the file. I want to name my files as error_200.txt, error_400.txt, error_800.txt and error_1600.txt respectively for each case. For that i have to mention the 'n' which contains different values in each loop, in the file name.

something like :fileID = fopen('error_'n'.txt','a') so that file will be automatically generated with the value of n in the name. Here is the code.............

for i = 1:4,

k = 2^i ;

n = k*100

    for step = 1:1000
        % here some calculations happen and data is generated,
        % and i write those date (error) in a file.
        error = n % for example
        D = [step; error;];
        fileID = fopen('error_'n'.txt','a');
        fprintf(fileID,'%6.2f %12.4f\n',D);
        fclose(fileID);
    end

end

Currently it writes all the data in single file. Pl help me modify the code to include the value of 'n' filename while writing the data so that 4 different file are generated with different names.

Thanks.