{"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":303,"title":"Convert Hard Drive marketing sizes to actual data sizes","description":"Hard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings.  For example:\r\n\r\nA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes\r\n10 GB of RAM though is equal to 10,737,418,240 bytes\r\n\r\nMore information about this can be found \u003chttp://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity here.\u003e\r\n\r\nThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\r\n\r\n  [100], 'MB' -\u003e [95.4]\r\n  [100], 'GB' -\u003e [93.1]\r\n","description_html":"\u003cp\u003eHard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings.  For example:\u003c/p\u003e\u003cp\u003eA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes\r\n10 GB of RAM though is equal to 10,737,418,240 bytes\u003c/p\u003e\u003cp\u003eMore information about this can be found \u003ca href=\"http://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity\"\u003ehere.\u003c/a\u003e\u003c/p\u003e\u003cp\u003eThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[100], 'MB' -\u003e [95.4]\r\n[100], 'GB' -\u003e [93.1]\r\n\u003c/pre\u003e","function_template":"function real_size = convert(advertised_size, units)\r\n  real_size = advertised_size;\r\nend","test_suite":"%%\r\na = 100;\r\nu = 'MB';\r\ny_correct = 95.4;\r\nassert(isequal(convert(a,u),y_correct))\r\n\r\n%%\r\na = 10;\r\nu = 'GB';\r\ny_correct = 9.31;\r\nassert(isequal(convert(a,u),y_correct))\r\n\r\n%%\r\na = 500;\r\nu = 'GB';\r\ny_correct = 465.5;\r\nassert(isequal(convert(a,u),y_correct))","published":true,"deleted":false,"likes_count":1,"comments_count":7,"created_by":1022,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":69,"test_suite_updated_at":"2012-02-10T04:43:54.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-02-10T04:43:54.000Z","updated_at":"2025-11-28T01:19:25.000Z","published_at":"2012-02-10T04:43:54.000Z","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\u003eHard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings. For example:\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\u003eA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes 10 GB of RAM though is equal to 10,737,418,240 bytes\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\u003eMore information about this can be found\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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\u003eThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\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[[100], 'MB' -\u003e [95.4]\\n[100], 'GB' -\u003e [93.1]]]\u003e\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":303,"title":"Convert Hard Drive marketing sizes to actual data sizes","description":"Hard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings.  For example:\r\n\r\nA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes\r\n10 GB of RAM though is equal to 10,737,418,240 bytes\r\n\r\nMore information about this can be found \u003chttp://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity here.\u003e\r\n\r\nThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\r\n\r\n  [100], 'MB' -\u003e [95.4]\r\n  [100], 'GB' -\u003e [93.1]\r\n","description_html":"\u003cp\u003eHard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings.  For example:\u003c/p\u003e\u003cp\u003eA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes\r\n10 GB of RAM though is equal to 10,737,418,240 bytes\u003c/p\u003e\u003cp\u003eMore information about this can be found \u003ca href=\"http://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity\"\u003ehere.\u003c/a\u003e\u003c/p\u003e\u003cp\u003eThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[100], 'MB' -\u003e [95.4]\r\n[100], 'GB' -\u003e [93.1]\r\n\u003c/pre\u003e","function_template":"function real_size = convert(advertised_size, units)\r\n  real_size = advertised_size;\r\nend","test_suite":"%%\r\na = 100;\r\nu = 'MB';\r\ny_correct = 95.4;\r\nassert(isequal(convert(a,u),y_correct))\r\n\r\n%%\r\na = 10;\r\nu = 'GB';\r\ny_correct = 9.31;\r\nassert(isequal(convert(a,u),y_correct))\r\n\r\n%%\r\na = 500;\r\nu = 'GB';\r\ny_correct = 465.5;\r\nassert(isequal(convert(a,u),y_correct))","published":true,"deleted":false,"likes_count":1,"comments_count":7,"created_by":1022,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":69,"test_suite_updated_at":"2012-02-10T04:43:54.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-02-10T04:43:54.000Z","updated_at":"2025-11-28T01:19:25.000Z","published_at":"2012-02-10T04:43:54.000Z","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\u003eHard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings. For example:\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\u003eA 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes 10 GB of RAM though is equal to 10,737,418,240 bytes\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\u003eMore information about this can be found\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://en.wikipedia.org/wiki/Hard_disk_drive#Units_of_storage_capacity\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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\u003eThe problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:\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[[100], 'MB' -\u003e [95.4]\\n[100], 'GB' -\u003e [93.1]]]\u003e\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:\"binary prefix\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}