{"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":44667,"title":"Draw 'I'","description":"Given n as input, draw a n-by-n matrix 'I' using 0 and 1.\r\n\r\nexample:\r\n\r\n  n=3\r\n  ans= \r\n  [0 1 0\r\n   0 1 0\r\n   0 1 0]\r\n  \r\n  n=4\r\n  [0 1 1 0\r\n   0 1 1 0\r\n   0 1 1 0\r\n   0 1 1 0]","description_html":"\u003cp\u003eGiven n as input, draw a n-by-n matrix 'I' using 0 and 1.\u003c/p\u003e\u003cp\u003eexample:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003en=3\r\nans= \r\n[0 1 0\r\n 0 1 0\r\n 0 1 0]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003en=4\r\n[0 1 1 0\r\n 0 1 1 0\r\n 0 1 1 0\r\n 0 1 1 0]\r\n\u003c/pre\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 1;\r\ny_correct = 1;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = 2;\r\ny_correct = [1 1;1 1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = 3;\r\ny_correct = [0 1 0;0 1 0;0 1 0];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = 4;\r\ny_correct = [0 1 1 0;0 1 1 0;0 1 1 0;0 1 1 0];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = 5;\r\ny_correct = [0 0 1 0 0; 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