{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","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":"2026-05-26T00:00:00.000Z","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":1830,"title":"Matrix rotation as per given angle","description":"Given a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\r\n\r\ne.g A = [1 2 3; \r\n         4 5 6; \r\n         7 8 9]\r\nAngle = 90\r\n\r\nOutput Matrix = [3 6 9;\r\n                 2 5 8; \r\n                 1 4 7]\r\n\r\nHappy clocking !!\r\n","description_html":"\u003cp\u003eGiven a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\u003c/p\u003e\u003cp\u003ee.g A = [1 2 3; \r\n         4 5 6; \r\n         7 8 9]\r\nAngle = 90\u003c/p\u003e\u003cp\u003eOutput Matrix = [3 6 9;\r\n                 2 5 8; \r\n                 1 4 7]\u003c/p\u003e\u003cp\u003eHappy clocking !!\u003c/p\u003e","function_template":"function y = RotateMat(x, angle)\r\n  y = x;\r\nend","test_suite":"%%\r\nx= [1 2 3; 4 5 6; 7 8 9]\r\nangle = 90;\r\ny_correct =[3 6  9; 2  5  8;  1 4 7];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n\r\n%%\r\nx = [ 1 2 3 4; -10 -20 -30 -40]\r\nangle = 270;\r\ny_correct =[ -10 1; -20 2; -30 3; -40 4];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n%%\r\nx = [ 1 2; 3 4; 5 6; 7 8]\r\nangle = -90;\r\ny_correct =[ 7 5 3 1;8 6 4 2];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n%%\r\nx = [ 89 -100 88 -101];\r\nangle = 180;\r\ny_correct =[  -101    88  -100    89];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":2,"created_by":16381,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":120,"test_suite_updated_at":"2013-08-15T21:19:19.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2013-08-15T20:45:14.000Z","updated_at":"2026-02-18T21:32:44.000Z","published_at":"2013-08-15T20:49:56.000Z","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\u003eGiven a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\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\u003ee.g A = [1 2 3; 4 5 6; 7 8 9] Angle = 90\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 Matrix = [3 6 9; 2 5 8; 1 4 7]\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\u003eHappy clocking !!\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":1830,"title":"Matrix rotation as per given angle","description":"Given a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\r\n\r\ne.g A = [1 2 3; \r\n         4 5 6; \r\n         7 8 9]\r\nAngle = 90\r\n\r\nOutput Matrix = [3 6 9;\r\n                 2 5 8; \r\n                 1 4 7]\r\n\r\nHappy clocking !!\r\n","description_html":"\u003cp\u003eGiven a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\u003c/p\u003e\u003cp\u003ee.g A = [1 2 3; \r\n         4 5 6; \r\n         7 8 9]\r\nAngle = 90\u003c/p\u003e\u003cp\u003eOutput Matrix = [3 6 9;\r\n                 2 5 8; \r\n                 1 4 7]\u003c/p\u003e\u003cp\u003eHappy clocking !!\u003c/p\u003e","function_template":"function y = RotateMat(x, angle)\r\n  y = x;\r\nend","test_suite":"%%\r\nx= [1 2 3; 4 5 6; 7 8 9]\r\nangle = 90;\r\ny_correct =[3 6  9; 2  5  8;  1 4 7];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n\r\n%%\r\nx = [ 1 2 3 4; -10 -20 -30 -40]\r\nangle = 270;\r\ny_correct =[ -10 1; -20 2; -30 3; -40 4];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n%%\r\nx = [ 1 2; 3 4; 5 6; 7 8]\r\nangle = -90;\r\ny_correct =[ 7 5 3 1;8 6 4 2];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n\r\n%%\r\nx = [ 89 -100 88 -101];\r\nangle = 180;\r\ny_correct =[  -101    88  -100    89];\r\nassert(isequal(RotateMat(x,angle),y_correct))\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":2,"created_by":16381,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":120,"test_suite_updated_at":"2013-08-15T21:19:19.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2013-08-15T20:45:14.000Z","updated_at":"2026-02-18T21:32:44.000Z","published_at":"2013-08-15T20:49:56.000Z","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\u003eGiven a user defined matrix and angle of rotation, rotate the elements of output matrix as clockwise or anti-clockwise. Angle will always be multiples of 90 degrees.\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\u003ee.g A = [1 2 3; 4 5 6; 7 8 9] Angle = 90\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 Matrix = [3 6 9; 2 5 8; 1 4 7]\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\u003eHappy clocking !!\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:\"anti-clockwise\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}