{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-26T00:14:02.000Z","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":"2026-04-26T00:00:00.000Z","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":699,"title":"Reading Web Binary Files (jpg,pdf,tiff,png)","description":"The Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\r\n\r\n.\r\n\r\nAccessing files on the web provide multiple challenges due to the data structures being text or binary.\r\n\r\nThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\r\n\r\n\r\n\r\nInput:\r\n\r\nfname 'http://some valid location/file.pdf'\r\n\r\nn      The byte for which the value is being requested.\r\n\r\nOutput: Value of the byte, an integer ranging from 0 to 255\r\n\r\n.\r\n\r\n\r\nA solution exists in the test suite to show the different data created by urlread and urlwrite for binary data.\r\n\r\nA urlreadbin can be readily created to directly push the file to an array.","description_html":"\u003cp\u003eThe Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\u003c/p\u003e\u003cp\u003e.\u003c/p\u003e\u003cp\u003eAccessing files on the web provide multiple challenges due to the data structures being text or binary.\u003c/p\u003e\u003cp\u003eThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\u003c/p\u003e\u003cp\u003eInput:\u003c/p\u003e\u003cp\u003efname 'http://some valid location/file.pdf'\u003c/p\u003e\u003cp\u003en      The byte for which the value is being requested.\u003c/p\u003e\u003cp\u003eOutput: Value of the byte, an integer ranging from 0 to 255\u003c/p\u003e\u003cp\u003e.\u003c/p\u003e\u003cp\u003eA solution exists in the test suite to show the different data created by urlread and urlwrite for binary data.\u003c/p\u003e\u003cp\u003eA urlreadbin can be readily created to directly push the file to an array.\u003c/p\u003e","function_template":"function y = access_web_pdf(fname,n)\r\n  y = 0;\r\nend","test_suite":"%%\r\n% Cody External accessibility\r\n\r\n% This file may need to change in the future\r\nin_f='http://www.pvplc.org/_volunteer/docs/PVPLC%20Trail%20Crew%20Training%20Jan-Jun%202012.pdf';\r\n\r\nout_f='PVPLC.pdf';\r\n\r\nurlwrite(in_f,out_f);\r\n\r\nfid=fopen(out_f);\r\nurlwrite_out=fread(fid,128,'*uint8'); \r\n% Display Correct Binary Data\r\nurlwrite_out(1:16)'\r\n\r\n\r\nblock=urlread(in_f);\r\n% Display invalid binary data\r\nurlread_out=block(1:16)-char(0)\r\n% unicode urlread conversion affects bytes 12 thru 15\r\n\r\nn=12\r\nbyte_val = access_web_pdf(in_f,n)\r\n\r\nbyte_correct=181;\r\n\r\nassert(isequal(byte_val,byte_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-05-18T04:26:21.000Z","updated_at":"2012-05-21T05:35:07.000Z","published_at":"2012-05-21T05:35:07.000Z","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\u003eThe Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\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\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAccessing files on the web provide multiple challenges due to the data structures being text or binary.\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\u003eThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\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\u003eInput:\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\u003efname 'http://some valid location/file.pdf'\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\u003en The byte for which the value is being requested.\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: Value of the byte, an integer ranging from 0 to 255\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\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA solution exists in the test suite to show the different data created by urlread and urlwrite for binary data.\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\u003eA urlreadbin can be readily created to directly push the file to an array.\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":{"errors":[],"problems":[{"id":699,"title":"Reading Web Binary Files (jpg,pdf,tiff,png)","description":"The Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\r\n\r\n.\r\n\r\nAccessing files on the web provide multiple challenges due to the data structures being text or binary.\r\n\r\nThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\r\n\r\n\r\n\r\nInput:\r\n\r\nfname 'http://some valid location/file.pdf'\r\n\r\nn      The byte for which the value is being requested.\r\n\r\nOutput: Value of the byte, an integer ranging from 0 to 255\r\n\r\n.\r\n\r\n\r\nA solution exists in the test suite to show the different data created by urlread and urlwrite for binary data.\r\n\r\nA urlreadbin can be readily created to directly push the file to an array.","description_html":"\u003cp\u003eThe Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\u003c/p\u003e\u003cp\u003e.\u003c/p\u003e\u003cp\u003eAccessing files on the web provide multiple challenges due to the data structures being text or binary.\u003c/p\u003e\u003cp\u003eThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\u003c/p\u003e\u003cp\u003eInput:\u003c/p\u003e\u003cp\u003efname 'http://some valid location/file.pdf'\u003c/p\u003e\u003cp\u003en      The byte for which the value is being requested.\u003c/p\u003e\u003cp\u003eOutput: Value of the byte, an integer ranging from 0 to 255\u003c/p\u003e\u003cp\u003e.\u003c/p\u003e\u003cp\u003eA solution exists in the test suite to show the different data created by urlread and urlwrite for binary data.\u003c/p\u003e\u003cp\u003eA urlreadbin can be readily created to directly push the file to an array.\u003c/p\u003e","function_template":"function y = access_web_pdf(fname,n)\r\n  y = 0;\r\nend","test_suite":"%%\r\n% Cody External accessibility\r\n\r\n% This file may need to change in the future\r\nin_f='http://www.pvplc.org/_volunteer/docs/PVPLC%20Trail%20Crew%20Training%20Jan-Jun%202012.pdf';\r\n\r\nout_f='PVPLC.pdf';\r\n\r\nurlwrite(in_f,out_f);\r\n\r\nfid=fopen(out_f);\r\nurlwrite_out=fread(fid,128,'*uint8'); \r\n% Display Correct Binary Data\r\nurlwrite_out(1:16)'\r\n\r\n\r\nblock=urlread(in_f);\r\n% Display invalid binary data\r\nurlread_out=block(1:16)-char(0)\r\n% unicode urlread conversion affects bytes 12 thru 15\r\n\r\nn=12\r\nbyte_val = access_web_pdf(in_f,n)\r\n\r\nbyte_correct=181;\r\n\r\nassert(isequal(byte_val,byte_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-05-18T04:26:21.000Z","updated_at":"2012-05-21T05:35:07.000Z","published_at":"2012-05-21T05:35:07.000Z","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\u003eThe Challenge is to access a Web binary file, a PDF in this case, and provide the value of a specific byte.\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\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAccessing files on the web provide multiple challenges due to the data structures being text or binary.\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\u003eThe functions urlread and urlwrite both access web files but provide different results for binary files. (jpg, pdf, tiff, png, ppt)\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\u003eInput:\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\u003efname 'http://some valid location/file.pdf'\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\u003en The byte for which the value is being requested.\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: Value of the byte, an integer ranging from 0 to 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