{"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":42998,"title":"Electrical Diode Current Calculation","description":"In engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\r\n\r\ni = I_s * exp(v/V_T) for v \u003e V_T\r\n\r\ni = −I_s for v ≤ V_T\r\n\r\nWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\r\n\r\n(Source: \u003chttps://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view 14:440:127 – Introduction to Computers for Engineers – HW3\u003e)","description_html":"\u003cp\u003eIn engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\u003c/p\u003e\u003cp\u003ei = I_s * exp(v/V_T) for v \u0026gt; V_T\u003c/p\u003e\u003cp\u003ei = −I_s for v ≤ V_T\u003c/p\u003e\u003cp\u003eWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\u003c/p\u003e\u003cp\u003e(Source: \u003ca href = \"https://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view\"\u003e14:440:127 – Introduction to Computers for Engineers – HW3\u003c/a\u003e)\u003c/p\u003e","function_template":"function [i] = diode(v)\r\n  Is = 1*10^-8;\r\n  Vt = 0.026;\r\n  i = v;\r\nend","test_suite":"%%\r\nv = 0.2;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = Is*exp(v/Vt);\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = 0.7;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = Is*exp(v/Vt);\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = 0.026;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = -Is;\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = -1;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = -Is;\r\nassert(isequal(diode(v),i_correct))","published":true,"deleted":false,"likes_count":8,"comments_count":6,"created_by":85443,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":1188,"test_suite_updated_at":"2016-09-30T01:43:51.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-09-30T01:33:10.000Z","updated_at":"2026-06-01T07:13:57.000Z","published_at":"2016-09-30T01:43:51.000Z","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\u003eIn engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\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\u003ei = I_s * exp(v/V_T) for v \u0026gt; V_T\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\u003ei = −I_s for v ≤ V_T\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\u003eWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\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\u003e(Source:\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=\\\"https://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e14:440:127 – Introduction to Computers for Engineers – HW3\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\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":42998,"title":"Electrical Diode Current Calculation","description":"In engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\r\n\r\ni = I_s * exp(v/V_T) for v \u003e V_T\r\n\r\ni = −I_s for v ≤ V_T\r\n\r\nWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\r\n\r\n(Source: \u003chttps://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view 14:440:127 – Introduction to Computers for Engineers – HW3\u003e)","description_html":"\u003cp\u003eIn engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\u003c/p\u003e\u003cp\u003ei = I_s * exp(v/V_T) for v \u0026gt; V_T\u003c/p\u003e\u003cp\u003ei = −I_s for v ≤ V_T\u003c/p\u003e\u003cp\u003eWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\u003c/p\u003e\u003cp\u003e(Source: \u003ca href = \"https://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view\"\u003e14:440:127 – Introduction to Computers for Engineers – HW3\u003c/a\u003e)\u003c/p\u003e","function_template":"function [i] = diode(v)\r\n  Is = 1*10^-8;\r\n  Vt = 0.026;\r\n  i = v;\r\nend","test_suite":"%%\r\nv = 0.2;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = Is*exp(v/Vt);\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = 0.7;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = Is*exp(v/Vt);\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = 0.026;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = -Is;\r\nassert(isequal(diode(v),i_correct))\r\n\r\n%%\r\nv = -1;\r\nIs = 1*10^-8;\r\nVt = 0.026;\r\ni_correct = -Is;\r\nassert(isequal(diode(v),i_correct))","published":true,"deleted":false,"likes_count":8,"comments_count":6,"created_by":85443,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":1188,"test_suite_updated_at":"2016-09-30T01:43:51.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-09-30T01:33:10.000Z","updated_at":"2026-06-01T07:13:57.000Z","published_at":"2016-09-30T01:43:51.000Z","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\u003eIn engineering, there is not always a single equation that describes a phenomenon accurately enough to be applied in all instances of that phenomenon. Sometimes it is more useful to use one equation in a set of circumstances, and another equation in a different set of circumstances. One example of this is with electrical diodes. A simplification of the approximation of the electrical characteristics of a diode uses these two simple equations:\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\u003ei = I_s * exp(v/V_T) for v \u0026gt; V_T\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\u003ei = −I_s for v ≤ V_T\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\u003eWhere V_T = 0.026 Volts and I_S = 1*10-8 Amperes. Write a function with one input, the voltage v across this diode, and one output, the current i running through the diode. Use a conditional statement in writing this program.\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\u003e(Source:\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=\\\"https://drive.google.com/file/d/0B9G6VyQGUYhnc0JSZHVVUkN3dkk/view\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e14:440:127 – Introduction to Computers for Engineers – HW3\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\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":"High School Challenge","count":1,"selected":false},{"value":"Real-World Problems ","count":1,"selected":false}],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"homework\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}