{"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":1125,"title":"Find out missing number from a vector of 9 elements","description":"You are given a vector of size 9, \r\n\r\nx = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\r\n\r\nElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\r\n\r\nFind a simple solution to find out missing value?\r\n","description_html":"\u003cp\u003eYou are given a vector of size 9,\u003c/p\u003e\u003cp\u003ex = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\u003c/p\u003e\u003cp\u003eElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\u003c/p\u003e\u003cp\u003eFind a simple solution to find out missing value?\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 2 3 4 5 6 7 8 9];\r\ny_correct = 0;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 0 2 3 4 5 7 8 9];\r\ny_correct = 1;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 7 8 1 0 3 4 5 9];\r\ny_correct = 2;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [7 8 1 5 6 9 2 0 4];\r\ny_correct = 3;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [0 1 9 2 6 7 8 3 5];\r\ny_correct = 4;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 7 1 2 8 9 3 0 4];\r\ny_correct = 5;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [9 8 7 5 4 3 2 1 0];\r\ny_correct = 6;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [2 1 3 0 8 4 9 5 6];\r\ny_correct = 7;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [9 1 5 6 7 0 3 2 4];\r\ny_correct = 8;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [ 3 5 7 8 0 4 6 1 2];\r\ny_correct = 9;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":1,"created_by":9317,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":322,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-17T17:28:03.000Z","updated_at":"2026-03-24T11:37:59.000Z","published_at":"2012-12-17T17:28:35.000Z","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 vector of size 9,\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\u003ex = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\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\u003eElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\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\u003eFind a simple solution to find out missing value?\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":1125,"title":"Find out missing number from a vector of 9 elements","description":"You are given a vector of size 9, \r\n\r\nx = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\r\n\r\nElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\r\n\r\nFind a simple solution to find out missing value?\r\n","description_html":"\u003cp\u003eYou are given a vector of size 9,\u003c/p\u003e\u003cp\u003ex = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\u003c/p\u003e\u003cp\u003eElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\u003c/p\u003e\u003cp\u003eFind a simple solution to find out missing value?\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 2 3 4 5 6 7 8 9];\r\ny_correct = 0;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 0 2 3 4 5 7 8 9];\r\ny_correct = 1;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 7 8 1 0 3 4 5 9];\r\ny_correct = 2;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [7 8 1 5 6 9 2 0 4];\r\ny_correct = 3;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [0 1 9 2 6 7 8 3 5];\r\ny_correct = 4;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [6 7 1 2 8 9 3 0 4];\r\ny_correct = 5;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [9 8 7 5 4 3 2 1 0];\r\ny_correct = 6;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [2 1 3 0 8 4 9 5 6];\r\ny_correct = 7;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [9 1 5 6 7 0 3 2 4];\r\ny_correct = 8;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = [ 3 5 7 8 0 4 6 1 2];\r\ny_correct = 9;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":1,"created_by":9317,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":322,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-17T17:28:03.000Z","updated_at":"2026-03-24T11:37:59.000Z","published_at":"2012-12-17T17:28:35.000Z","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 vector of size 9,\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\u003ex = [x1 x2 x3 x4 x5 x6 x7 x8 x9]\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\u003eElements of x may be randomly selected without repeating from 0,1,2,3,4,5,6,7,8,9\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\u003eFind a simple solution to find out missing value?\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":"easy","count":1,"selected":false}]],"term":"tag:\"missing element\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}