{"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":3053,"title":"stem and leaf plot","description":"A stem-and-leaf display is a device for presenting quantitative data in a graphical  format, similar to a histogram, to assist in visualizing the shape of a distribution. \r\n\r\nExample \r\n\r\nGiven some series of numbers like this\r\n\r\n 12 15 14 23 24 26 28 33 38 39\r\n\r\nyou should convert it this one \r\n\r\n 1 | 245\r\n 2 | 3468\r\n 3 | 389\r\n\r\n input is  {'12','15','14','23','24','26','28','33','38','39'}\r\n\r\n output will be {'1245','23468','3389'}\r\n\r\nNote: input numbers must be sorted increasing order.\r\n","description_html":"\u003cp\u003eA stem-and-leaf display is a device for presenting quantitative data in a graphical  format, similar to a histogram, to assist in visualizing the shape of a distribution.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cp\u003eGiven some series of numbers like this\u003c/p\u003e\u003cpre\u003e 12 15 14 23 24 26 28 33 38 39\u003c/pre\u003e\u003cp\u003eyou should convert it this one\u003c/p\u003e\u003cpre\u003e 1 | 245\r\n 2 | 3468\r\n 3 | 389\u003c/pre\u003e\u003cpre\u003e input is  {'12','15','14','23','24','26','28','33','38','39'}\u003c/pre\u003e\u003cpre\u003e output will be {'1245','23468','3389'}\u003c/pre\u003e\u003cp\u003eNote: input numbers must be sorted increasing order.\u003c/p\u003e","function_template":"function y = stem_leaf(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = {'12','15','14','23','24','26','28','33','38','39'}\r\ny_correct = {'1245','23468','3389'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'00','11','02','33','32','31','34','14'}\r\ny_correct = {'002','114','31234'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'04','13','12','11','14','16','17','18','13','12','11','14','16','17','18'}\r\ny_correct = {'04','111223344667788'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'23','123','125','105','24','106'}\r\ny_correct = {'234','1056','1235'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'01','12','33','45','54','67'};\r\ny_correct = x;\r\nassert(isequal(stem_leaf(x),y_correct))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":8,"created_by":22216,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":19,"test_suite_updated_at":"2015-02-28T14:42:59.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2015-02-28T14:25:33.000Z","updated_at":"2026-05-28T04:45:39.000Z","published_at":"2015-02-28T14:42:59.000Z","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\u003eA stem-and-leaf display is a device for presenting quantitative data in a graphical format, similar to a histogram, to assist in visualizing the shape of a distribution.\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\u003eExample\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\u003eGiven some series of numbers like this\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ 12 15 14 23 24 26 28 33 38 39]]\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:t\u003eyou should convert it this one\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ 1 | 245\\n 2 | 3468\\n 3 | 389\\n\\n input is  {'12','15','14','23','24','26','28','33','38','39'}\\n\\n output will be {'1245','23468','3389'}]]\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:t\u003eNote: input numbers must be sorted increasing order.\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":3053,"title":"stem and leaf plot","description":"A stem-and-leaf display is a device for presenting quantitative data in a graphical  format, similar to a histogram, to assist in visualizing the shape of a distribution. \r\n\r\nExample \r\n\r\nGiven some series of numbers like this\r\n\r\n 12 15 14 23 24 26 28 33 38 39\r\n\r\nyou should convert it this one \r\n\r\n 1 | 245\r\n 2 | 3468\r\n 3 | 389\r\n\r\n input is  {'12','15','14','23','24','26','28','33','38','39'}\r\n\r\n output will be {'1245','23468','3389'}\r\n\r\nNote: input numbers must be sorted increasing order.\r\n","description_html":"\u003cp\u003eA stem-and-leaf display is a device for presenting quantitative data in a graphical  format, similar to a histogram, to assist in visualizing the shape of a distribution.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cp\u003eGiven some series of numbers like this\u003c/p\u003e\u003cpre\u003e 12 15 14 23 24 26 28 33 38 39\u003c/pre\u003e\u003cp\u003eyou should convert it this one\u003c/p\u003e\u003cpre\u003e 1 | 245\r\n 2 | 3468\r\n 3 | 389\u003c/pre\u003e\u003cpre\u003e input is  {'12','15','14','23','24','26','28','33','38','39'}\u003c/pre\u003e\u003cpre\u003e output will be {'1245','23468','3389'}\u003c/pre\u003e\u003cp\u003eNote: input numbers must be sorted increasing order.\u003c/p\u003e","function_template":"function y = stem_leaf(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = {'12','15','14','23','24','26','28','33','38','39'}\r\ny_correct = {'1245','23468','3389'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'00','11','02','33','32','31','34','14'}\r\ny_correct = {'002','114','31234'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'04','13','12','11','14','16','17','18','13','12','11','14','16','17','18'}\r\ny_correct = {'04','111223344667788'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'23','123','125','105','24','106'}\r\ny_correct = {'234','1056','1235'}\r\nassert(isequal(stem_leaf(x),y_correct))\r\n%%\r\nx = {'01','12','33','45','54','67'};\r\ny_correct = x;\r\nassert(isequal(stem_leaf(x),y_correct))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":8,"created_by":22216,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":19,"test_suite_updated_at":"2015-02-28T14:42:59.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2015-02-28T14:25:33.000Z","updated_at":"2026-05-28T04:45:39.000Z","published_at":"2015-02-28T14:42:59.000Z","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\u003eA stem-and-leaf display is a device for presenting quantitative data in a graphical format, similar to a histogram, to assist in visualizing the shape of a distribution.\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\u003eExample\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\u003eGiven some series of numbers like this\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ 12 15 14 23 24 26 28 33 38 39]]\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:t\u003eyou should convert it this one\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ 1 | 245\\n 2 | 3468\\n 3 | 389\\n\\n input is  {'12','15','14','23','24','26','28','33','38','39'}\\n\\n output will be {'1245','23468','3389'}]]\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:t\u003eNote: input numbers must be sorted increasing order.\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:\"stem-leaf\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}