Cody

# Problem 1753. Calculate FFT

Solution 732915

Submitted on 10 Sep 2015 by Peng Liu
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### Test Suite

Test Status Code Input and Output
1   Pass
%% % Clean workspace !/bin/cp my_function.m safe !/bin/rm *.* !/bin/mv safe my_function.m !/bin/rm @* % Clean user's function from some known jailbreaking mechanisms functions = {'!','feval','eval','str2func','str2num','regex','system','dos','unix','perl','java','fopen','write','save','setenv','path','fft'}; fid = fopen('my_function.m'); st = char(fread(fid)'); for n = 1:numel(functions) st = regexprep(st, functions{n}, 'error(''No fancy functions!''); %', 'ignorecase'); end fclose(fid) % Force a function header, and comment first code's line (the supposedly users' function header) st = sprintf('function y = my_function(x)\n%%%s', st); fid = fopen('my_function.m' , 'w'); fwrite(fid,st); fclose(fid) rng(now); input = rand(1, 1000); output = my_function(input); % just ignore this !/bin/cp my_function.m safe !/bin/rm *.* !/bin/mv safe my_function.m !/bin/rm @* path(pathdef); % undo any change on search path assert(sum(abs(output - fft(input))) < 1e-8) % accounts for some FP errors

/bin/rm: cannot remove ‘@*’: No such file or directory ans = 0 ans = 0 /bin/rm: cannot remove ‘@*’: No such file or directory