{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-06-05T00:10:21.000Z","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":"2026-06-05T00:00:00.000Z","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":44412,"title":"Decoder Ring","description":"You are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\r\n\r\nex.\r\n\r\nencoded_message =  [100,26,104,47;67,103,32,107;105,93,104,78]\r\n\r\nDecoder_Ring = [1,3;3,1]\r\n\r\nOutput = 'hi'","description_html":"\u003cp\u003eYou are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\u003c/p\u003e\u003cp\u003eex.\u003c/p\u003e\u003cp\u003eencoded_message =  [100,26,104,47;67,103,32,107;105,93,104,78]\u003c/p\u003e\u003cp\u003eDecoder_Ring = [1,3;3,1]\u003c/p\u003e\u003cp\u003eOutput = 'hi'\u003c/p\u003e","function_template":"function Output = Decode(Decoder_Ring,encoded_message)\r\n  Output = ....;\r\nend","test_suite":"%%\r\nencoded_message = [100,26,104,47;67,103,32,107;105,93,104,78];\r\nDecoder_Ring = [1,3;3,1];\r\ny_correct = 'hi';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = [100,26,114,47,83;67,117,103,32,107;105,93,104,78,22;112,110,111,94,101;96,82,43,115,113;22,105,44,112,94];\r\nDecoder_Ring = [1,2,1,4,1,6,5,4;5,2,3,1,3,2,4,5];\r\ny_correct = 'Surprise';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = [33,84,100,103,107,10,22,44,67,92;\r\n        102,95,91,36,64,48,47,57,90,100;\r\n        84,112,150,32,50,68,72,99,115,30;\r\n        98,109,108,50,100,111,116,31,48,49;\r\n        21,41,81,85,105,108,18,17,133,132;\r\n        1,12,105,110,103,102,49,32,30,100;\r\n        111,101,98,97,103,104,88,77,71,91;\r\n        114,111,117,100,105,94,48,119,33,49;\r\n        109,108,42,27,76,110,90,55,120,113;\r\n        123,124,13,39,94,43,99,87,19,10];\r\nDecoder_Ring = [1,7,8,3,3,9,7,3,3,7,1,7,6,8,5,4,9,3,3,7,9,6,6,4,7,3,4,8,8,3,4,6,8,6,6,4,8,3,3,7,10,8,9,8,3;\r\n        2,6,5,9,4,1,2,9,9,4,4,2,8,8,5,3,2,4,9,2,2,6,8,5,2,9,7,1,3,8,7,8,5,4,8,10,7,4,9,2,7,2,6,4,9]; \r\ny_correct = 'This message will self destruct in 10 seconds';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = reshape([50:149],10,[]);\r\nDecoder_Ring = [6,7,5,8,6,4,5,7;7,7,7,5,6,6,6,7];\r\ny_correct = 'straight';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":136968,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":24,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-11-22T20:36:52.000Z","updated_at":"2026-05-29T03:47:35.000Z","published_at":"2017-11-22T20:36:52.000Z","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\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"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\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\u003eYou are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eex.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eencoded_message = [100,26,104,47;67,103,32,107;105,93,104,78]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDecoder_Ring = [1,3;3,1]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput = 'hi'\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":{"problems":[{"id":44412,"title":"Decoder Ring","description":"You are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\r\n\r\nex.\r\n\r\nencoded_message =  [100,26,104,47;67,103,32,107;105,93,104,78]\r\n\r\nDecoder_Ring = [1,3;3,1]\r\n\r\nOutput = 'hi'","description_html":"\u003cp\u003eYou are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\u003c/p\u003e\u003cp\u003eex.\u003c/p\u003e\u003cp\u003eencoded_message =  [100,26,104,47;67,103,32,107;105,93,104,78]\u003c/p\u003e\u003cp\u003eDecoder_Ring = [1,3;3,1]\u003c/p\u003e\u003cp\u003eOutput = 'hi'\u003c/p\u003e","function_template":"function Output = Decode(Decoder_Ring,encoded_message)\r\n  Output = ....;\r\nend","test_suite":"%%\r\nencoded_message = [100,26,104,47;67,103,32,107;105,93,104,78];\r\nDecoder_Ring = [1,3;3,1];\r\ny_correct = 'hi';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = [100,26,114,47,83;67,117,103,32,107;105,93,104,78,22;112,110,111,94,101;96,82,43,115,113;22,105,44,112,94];\r\nDecoder_Ring = [1,2,1,4,1,6,5,4;5,2,3,1,3,2,4,5];\r\ny_correct = 'Surprise';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = [33,84,100,103,107,10,22,44,67,92;\r\n        102,95,91,36,64,48,47,57,90,100;\r\n        84,112,150,32,50,68,72,99,115,30;\r\n        98,109,108,50,100,111,116,31,48,49;\r\n        21,41,81,85,105,108,18,17,133,132;\r\n        1,12,105,110,103,102,49,32,30,100;\r\n        111,101,98,97,103,104,88,77,71,91;\r\n        114,111,117,100,105,94,48,119,33,49;\r\n        109,108,42,27,76,110,90,55,120,113;\r\n        123,124,13,39,94,43,99,87,19,10];\r\nDecoder_Ring = [1,7,8,3,3,9,7,3,3,7,1,7,6,8,5,4,9,3,3,7,9,6,6,4,7,3,4,8,8,3,4,6,8,6,6,4,8,3,3,7,10,8,9,8,3;\r\n        2,6,5,9,4,1,2,9,9,4,4,2,8,8,5,3,2,4,9,2,2,6,8,5,2,9,7,1,3,8,7,8,5,4,8,10,7,4,9,2,7,2,6,4,9]; \r\ny_correct = 'This message will self destruct in 10 seconds';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))\r\n\r\n%%\r\nencoded_message = reshape([50:149],10,[]);\r\nDecoder_Ring = [6,7,5,8,6,4,5,7;7,7,7,5,6,6,6,7];\r\ny_correct = 'straight';\r\nassert(isequal(Decode(Decoder_Ring,encoded_message),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":136968,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":24,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-11-22T20:36:52.000Z","updated_at":"2026-05-29T03:47:35.000Z","published_at":"2017-11-22T20:36:52.000Z","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\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"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\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\u003eYou are given a matrix of numbers, your objective is to use the decoder ring to find the hidden message.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eex.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eencoded_message = [100,26,104,47;67,103,32,107;105,93,104,78]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDecoder_Ring = [1,3;3,1]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput = 'hi'\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\"}]}"}],"errors":[],"facets":[[],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"spy games\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}