{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":1148,"title":"Compression: Encode and Decode","description":"This Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\r\n\r\nThe first call will provide the array x. The output is the filename of the data encoded file. \r\n\r\nThe second call will provide the filename. The output is the numeric array by decoding the file.\r\n\r\n\r\n\r\n*Success:* File size less than 4,100,000 bytes and a correct decoded array.\r\n\r\n*Scoring:* Scaled file size.\r\n\r\n*Encode Call:*\r\n\r\n*Input:* x % randi(2^32-1,1000)\r\n\r\n*Output:* filename\r\n\r\n.\r\n.\r\n\r\n*Decode Call:*\r\n\r\n*Input:* filename\r\n\r\n*Output:* x_array\r\n  \r\nNote: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.","description_html":"\u003cp\u003eThis Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\u003c/p\u003e\u003cp\u003eThe first call will provide the array x. The output is the filename of the data encoded file.\u003c/p\u003e\u003cp\u003eThe second call will provide the filename. The output is the numeric array by decoding the file.\u003c/p\u003e\u003cp\u003e\u003cb\u003eSuccess:\u003c/b\u003e File size less than 4,100,000 bytes and a correct decoded array.\u003c/p\u003e\u003cp\u003e\u003cb\u003eScoring:\u003c/b\u003e Scaled file size.\u003c/p\u003e\u003cp\u003e\u003cb\u003eEncode Call:\u003c/b\u003e\u003c/p\u003e\u003cp\u003e\u003cb\u003eInput:\u003c/b\u003e x % randi(2^32-1,1000)\u003c/p\u003e\u003cp\u003e\u003cb\u003eOutput:\u003c/b\u003e filename\u003c/p\u003e\u003cp\u003e.\r\n.\u003c/p\u003e\u003cp\u003e\u003cb\u003eDecode Call:\u003c/b\u003e\u003c/p\u003e\u003cp\u003e\u003cb\u003eInput:\u003c/b\u003e filename\u003c/p\u003e\u003cp\u003e\u003cb\u003eOutput:\u003c/b\u003e x_array\u003c/p\u003e\u003cp\u003eNote: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.\u003c/p\u003e","function_template":"function P = encode_decode(x)\r\n% P is the file_name string if x is an array\r\n% P is an array if x is the filename to decode\r\n P=x;\r\nend","test_suite":"%%\r\nfeval(@assignin,'caller','score',8000);\r\n%%\r\nfiletext = fileread('encode_decode.m');\r\n% Avoid Size 0 solutions\r\nassert(isempty(strfind(filetext, 'persistent')))\r\nassert(isempty(strfind(filetext, 'global')))\r\n%%\r\nx=randi(2^32-1,1000);\r\n\r\n\r\ndirfiles_orig=dir;\r\nnum_orig=size(dirfiles_orig,1);\r\n\r\nfname=encode_decode(x);\r\n\r\ndirfiles=dir;\r\nnum_encode=size(dirfiles,1);\r\n\r\nc=dir(fname);\r\nfprintf('Bytes %i\\n',c.bytes)\r\nfile_size=floor(c.bytes/1000);\r\n\r\nassert(num_encode==num_orig+1,'Virus Detected');\r\n\r\n\r\nxout=encode_decode(fname);\r\n\r\n\r\nassert(file_size\u003c4100,sprintf('File Size %i\\n',file_size)) \r\nassert(isequal(x,xout),'xout ~= x')\r\n\r\nfeval(  @assignin,'caller','score',floor(min( 8000,file_size ))  );\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":12,"test_suite_updated_at":"2012-12-30T03:12:39.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-28T22:43:52.000Z","updated_at":"2012-12-30T03:21:48.000Z","published_at":"2012-12-28T23:29:43.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first call will provide the array x. The output is the filename of the data encoded file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe second call will provide the filename. The output is the numeric array by decoding the file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eSuccess:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e File size less than 4,100,000 bytes and a correct decoded array.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eScoring:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e Scaled file size.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eEncode Call:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e x % randi(2^32-1,1000)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e filename\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e. .\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eDecode Call:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e filename\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e x_array\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNote: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":1148,"title":"Compression: Encode and Decode","description":"This Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\r\n\r\nThe first call will provide the array x. The output is the filename of the data encoded file. \r\n\r\nThe second call will provide the filename. The output is the numeric array by decoding the file.\r\n\r\n\r\n\r\n*Success:* File size less than 4,100,000 bytes and a correct decoded array.\r\n\r\n*Scoring:* Scaled file size.\r\n\r\n*Encode Call:*\r\n\r\n*Input:* x % randi(2^32-1,1000)\r\n\r\n*Output:* filename\r\n\r\n.\r\n.\r\n\r\n*Decode Call:*\r\n\r\n*Input:* filename\r\n\r\n*Output:* x_array\r\n  \r\nNote: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.","description_html":"\u003cp\u003eThis Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\u003c/p\u003e\u003cp\u003eThe first call will provide the array x. The output is the filename of the data encoded file.\u003c/p\u003e\u003cp\u003eThe second call will provide the filename. The output is the numeric array by decoding the file.\u003c/p\u003e\u003cp\u003e\u003cb\u003eSuccess:\u003c/b\u003e File size less than 4,100,000 bytes and a correct decoded array.\u003c/p\u003e\u003cp\u003e\u003cb\u003eScoring:\u003c/b\u003e Scaled file size.\u003c/p\u003e\u003cp\u003e\u003cb\u003eEncode Call:\u003c/b\u003e\u003c/p\u003e\u003cp\u003e\u003cb\u003eInput:\u003c/b\u003e x % randi(2^32-1,1000)\u003c/p\u003e\u003cp\u003e\u003cb\u003eOutput:\u003c/b\u003e filename\u003c/p\u003e\u003cp\u003e.\r\n.\u003c/p\u003e\u003cp\u003e\u003cb\u003eDecode Call:\u003c/b\u003e\u003c/p\u003e\u003cp\u003e\u003cb\u003eInput:\u003c/b\u003e filename\u003c/p\u003e\u003cp\u003e\u003cb\u003eOutput:\u003c/b\u003e x_array\u003c/p\u003e\u003cp\u003eNote: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.\u003c/p\u003e","function_template":"function P = encode_decode(x)\r\n% P is the file_name string if x is an array\r\n% P is an array if x is the filename to decode\r\n P=x;\r\nend","test_suite":"%%\r\nfeval(@assignin,'caller','score',8000);\r\n%%\r\nfiletext = fileread('encode_decode.m');\r\n% Avoid Size 0 solutions\r\nassert(isempty(strfind(filetext, 'persistent')))\r\nassert(isempty(strfind(filetext, 'global')))\r\n%%\r\nx=randi(2^32-1,1000);\r\n\r\n\r\ndirfiles_orig=dir;\r\nnum_orig=size(dirfiles_orig,1);\r\n\r\nfname=encode_decode(x);\r\n\r\ndirfiles=dir;\r\nnum_encode=size(dirfiles,1);\r\n\r\nc=dir(fname);\r\nfprintf('Bytes %i\\n',c.bytes)\r\nfile_size=floor(c.bytes/1000);\r\n\r\nassert(num_encode==num_orig+1,'Virus Detected');\r\n\r\n\r\nxout=encode_decode(fname);\r\n\r\n\r\nassert(file_size\u003c4100,sprintf('File Size %i\\n',file_size)) \r\nassert(isequal(x,xout),'xout ~= x')\r\n\r\nfeval(  @assignin,'caller','score',floor(min( 8000,file_size ))  );\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":12,"test_suite_updated_at":"2012-12-30T03:12:39.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-28T22:43:52.000Z","updated_at":"2012-12-30T03:21:48.000Z","published_at":"2012-12-28T23:29:43.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first call will provide the array x. The output is the filename of the data encoded file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe second call will provide the filename. The output is the numeric array by decoding the file.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eSuccess:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e File size less than 4,100,000 bytes and a correct decoded array.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eScoring:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e Scaled file size.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eEncode Call:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e x % randi(2^32-1,1000)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e filename\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e. .\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eDecode Call:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e filename\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e x_array\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNote: global and persistent are not allowed. 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