{"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":52714,"title":"Multiply binary numbers","description":"Write a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.4333px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: rgb(0, 0, 0); white-space: normal; \"\u003e\u003cdiv style=\"block-size: 42px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 21px; transform-origin: 407px 21px; vertical-align: baseline; \"\u003e\u003cdiv style=\"font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 375.508px 8.05px; transform-origin: 375.508px 8.05px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eWrite a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function y = binmult(a,b)\r\n  y = dec2bin(bin2dec(a)*bin2dec(b));\r\nend","test_suite":"%%\r\na = '1011';\r\nb = '101';\r\ny_correct = '110111';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '1011';\r\nb = '101';\r\ny_correct = '110111';\r\nassert(isequal(binmult(b,a),y_correct))\r\n\r\n%%\r\na = '1010011101110011';\r\nb = '1111001001110011';\r\ny_correct = '10011110100101011110111010101001';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '101010101';\r\nb = '11011011';\r\ny_correct = '10010001110110111';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%% Tommy Tutone x Glenn Miller\r\na = '100001000101111111101101';\r\nb = '1111110111101000';\r\ny_correct = '1000001101001010110001000010011111001000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '100110011001000111010010010010011';\r\nb = '10101011010100101010000';\r\ny_correct = '1100110110001011111100000100111100101110111100011110000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '10111000101111001000101001001';\r\nb = '1000101010001101011001111011011';\r\ny_correct = '11000111111101110101101001110100010101101010101010001110011';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '111111111111111111111111000010';\r\nb = '1111111111111111111111110000011';\r\ny_correct = '1111111111111111111111100000111000000000000000001111001000110';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '10110101111001100010000011110100011111111111111';\r\nb = '10000001010110011011000100001000111000111000';\r\ny_correct = '101101111101000101100010110011100010111000111111001001110111001111001011010111000111001000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\nr = randi(18)+100;\r\na = repmat('1010',1,r);\r\nb = '11';\r\ny_correct = [repelem('1',1,4*r) '0'];\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\nfiletext = fileread('binmult.m');\r\nillegal = contains(filetext, 'assignin') || contains(filetext, 'java') || contains(filetext, 'py'); \r\nassert(~illegal)\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":3,"created_by":46909,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":10,"test_suite_updated_at":"2021-09-16T03:55:20.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2021-09-15T05:06:50.000Z","updated_at":"2021-09-16T03:55:20.000Z","published_at":"2021-09-15T05:12:04.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"problem_search":{"problems":[{"id":52714,"title":"Multiply binary numbers","description":"Write a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.4333px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: rgb(0, 0, 0); white-space: normal; \"\u003e\u003cdiv style=\"block-size: 42px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 21px; transform-origin: 407px 21px; vertical-align: baseline; \"\u003e\u003cdiv style=\"font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 375.508px 8.05px; transform-origin: 375.508px 8.05px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eWrite a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function y = binmult(a,b)\r\n  y = dec2bin(bin2dec(a)*bin2dec(b));\r\nend","test_suite":"%%\r\na = '1011';\r\nb = '101';\r\ny_correct = '110111';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '1011';\r\nb = '101';\r\ny_correct = '110111';\r\nassert(isequal(binmult(b,a),y_correct))\r\n\r\n%%\r\na = '1010011101110011';\r\nb = '1111001001110011';\r\ny_correct = '10011110100101011110111010101001';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '101010101';\r\nb = '11011011';\r\ny_correct = '10010001110110111';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%% Tommy Tutone x Glenn Miller\r\na = '100001000101111111101101';\r\nb = '1111110111101000';\r\ny_correct = '1000001101001010110001000010011111001000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '100110011001000111010010010010011';\r\nb = '10101011010100101010000';\r\ny_correct = '1100110110001011111100000100111100101110111100011110000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '10111000101111001000101001001';\r\nb = '1000101010001101011001111011011';\r\ny_correct = '11000111111101110101101001110100010101101010101010001110011';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '111111111111111111111111000010';\r\nb = '1111111111111111111111110000011';\r\ny_correct = '1111111111111111111111100000111000000000000000001111001000110';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\na = '10110101111001100010000011110100011111111111111';\r\nb = '10000001010110011011000100001000111000111000';\r\ny_correct = '101101111101000101100010110011100010111000111111001001110111001111001011010111000111001000';\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\nr = randi(18)+100;\r\na = repmat('1010',1,r);\r\nb = '11';\r\ny_correct = [repelem('1',1,4*r) '0'];\r\nassert(isequal(binmult(a,b),y_correct))\r\n\r\n%%\r\nfiletext = fileread('binmult.m');\r\nillegal = contains(filetext, 'assignin') || contains(filetext, 'java') || contains(filetext, 'py'); \r\nassert(~illegal)\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":3,"created_by":46909,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":10,"test_suite_updated_at":"2021-09-16T03:55:20.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2021-09-15T05:06:50.000Z","updated_at":"2021-09-16T03:55:20.000Z","published_at":"2021-09-15T05:12:04.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110111’.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"errors":[],"facets":[[],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"base 2\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}