// Numbas version: finer_feedback_settings
{"name": "Subtraction of Matrices", "extensions": [], "custom_part_types": [], "resources": [["question-resources/matrix_add.gif", "/srv/numbas/media/question-resources/matrix_add.gif"], ["question-resources/matrix_sub.gif", "/srv/numbas/media/question-resources/matrix_sub.gif"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Subtraction of Matrices", "tags": [], "metadata": {"description": "Matrix subtraction (student defines dimensions in answer)", "licence": "Creative Commons Attribution-NonCommercial 4.0 International"}, "statement": "<h1>Subtraction of Matrices</h1>\n<p>For each of the following matrices, carry out the subtraction</p>", "advice": "<p>Subtraction is achieved by subtracting corresponding elements:</p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/matrix_sub.gif\" width=\"350\" height=\"130\"/></p>\n<p style=\"text-align: left;\">Using this technique gives us:</p>\n<p style=\"text-align: left;\"><strong>a)</strong></p>\n<p>$$<br/>\\begin{aligned}<br/>A - B &amp;= \\var{A} - \\var{A2} \\\\<br/>&amp;= \\var{ad1}<br/>\\end{aligned}<br/>$$</p>\n<p><strong>b)</strong></p>\n<p>$$<br/>\\begin{aligned}<br/>C - D &amp;= \\var{B} - \\var{B2} \\\\<br/>&amp;= \\var{ad2}<br/>\\end{aligned}<br/>$$</p>\n<p><strong>c)</strong></p>\n<p>$$<br/>\\begin{aligned}<br/>E - F &amp;= \\var{C} - \\var{C2} \\\\ <br/>&amp;= \\var{ad3}<br/>\\end{aligned}<br/>$$</p>\n<p><strong>d)</strong></p>\n<p>$$<br/>\\begin{aligned}<br/>G - H &amp;= \\var{D} - \\var{D2} \\\\ <br/>&amp;= \\var{ad4}<br/>\\end{aligned}<br/>$$</p>\n<p><strong>e)</strong></p>\n<p>$$<br/>\\begin{aligned}<br/>I - J &amp;= \\var{EE} - \\var{EE2} \\\\<br/>&amp;= \\var{ad5}<br/>\\end{aligned}<br/>$$</p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"m1": {"name": "m1", "group": "A", "definition": "n1", "description": "", "templateType": "anything", "can_override": false}, "A": {"name": "A", "group": "A", "definition": "transpose(matrix(repeat(repeat(random(0..9),n1),m1)))", "description": "", "templateType": "anything", "can_override": false}, "n2": {"name": "n2", "group": "B", "definition": "random(2 .. 4#1)", "description": "", "templateType": "randrange", "can_override": false}, "m2": {"name": "m2", "group": "B", "definition": "random(2 .. 4#1)", "description": "", "templateType": "randrange", "can_override": false}, "B": {"name": "B", "group": "B", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n2),m2)))", "description": "", "templateType": "anything", "can_override": false}, "n3": {"name": "n3", "group": "C", "definition": "random(1 .. 4#1)", "description": "", "templateType": "randrange", "can_override": false}, "m3": {"name": "m3", "group": "C", "definition": "random(2 .. 5#1)", "description": "", "templateType": "randrange", "can_override": false}, "C": {"name": "C", "group": "C", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n3),m3)))", "description": "", "templateType": "anything", "can_override": false}, "n4": {"name": "n4", "group": "D", "definition": "random(1 .. 3#1)", "description": "", "templateType": "randrange", "can_override": false}, "m4": {"name": "m4", "group": "D", "definition": "random(2 .. 4#1)", "description": "", "templateType": "randrange", "can_override": false}, "n1": {"name": "n1", "group": "A", "definition": "3", "description": "", "templateType": "number", "can_override": false}, "D": {"name": "D", "group": "D", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n4),m4)))", "description": "", "templateType": "anything", "can_override": false}, "n5": {"name": "n5", "group": "E", "definition": "random(1 .. 3#1)", "description": "", "templateType": "randrange", "can_override": false}, "m5": {"name": "m5", "group": "E", "definition": "random(2 .. 4#1)", "description": "", "templateType": "randrange", "can_override": false}, "EE": {"name": "EE", "group": "E", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n5),m5)))", "description": "", "templateType": "anything", "can_override": false}, "e1": {"name": "e1", "group": "A", "definition": "A[n1-1][m1-1]", "description": "", "templateType": "anything", "can_override": false}, "E2": {"name": "E2", "group": "B", "definition": "b[n2-1][m2-1]", "description": "", "templateType": "anything", "can_override": false}, "trC": {"name": "trC", "group": "C", "definition": "(C[0][0])+(C[1][1])+(C[2][2])+(C[3][3])+(C[4][4])", "description": "", "templateType": "anything", "can_override": false}, "A2": {"name": "A2", "group": "A", "definition": "transpose(matrix(repeat(repeat(random(0..9),n1),m1)))", "description": "", "templateType": "anything", "can_override": false}, "B2": {"name": "B2", "group": "B", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n2),m2)))", "description": "", "templateType": "anything", "can_override": false}, "C2": {"name": "C2", "group": "C", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n3),m3)))", "description": "", "templateType": "anything", "can_override": false}, "D2": {"name": "D2", "group": "D", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n4),m4)))", "description": "", "templateType": "anything", "can_override": false}, "EE2": {"name": "EE2", "group": "E", "definition": "transpose(matrix(repeat(repeat(random(-9..9),n5),m5)))", "description": "", "templateType": "anything", "can_override": false}, "ad1": {"name": "ad1", "group": "Ungrouped variables", "definition": "{A}-{A2}", "description": "", "templateType": "anything", "can_override": false}, "ad2": {"name": "ad2", "group": "Ungrouped variables", "definition": "{B}-{B2}", "description": "", "templateType": "anything", "can_override": false}, "ad3": {"name": "ad3", "group": "Ungrouped variables", "definition": "{C}-{C2}", "description": "", "templateType": "anything", "can_override": false}, "ad4": {"name": "ad4", "group": "Ungrouped variables", "definition": "{D}-{D2}", "description": "", "templateType": "anything", "can_override": false}, "ad5": {"name": "ad5", "group": "Ungrouped variables", "definition": "{EE}-{EE2}", "description": "", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["ad1", "ad2", "ad3", "ad4", "ad5"], "variable_groups": [{"name": "A", "variables": ["n1", "m1", "A", "e1", "A2"]}, {"name": "B", "variables": ["n2", "m2", "B", "E2", "B2"]}, {"name": "C", "variables": ["n3", "m3", "C", "trC", "C2"]}, {"name": "D", "variables": ["n4", "m4", "D", "D2"]}, {"name": "E", "variables": ["n5", "m5", "EE", "EE2"]}], "functions": {"calculateTrace": {"parameters": [], "type": "number", "language": "javascript", "definition": ""}}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": false, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Let:</p>\n<p>$$<br/>A=\\var{A}, B=\\var{A2}<br/>$$</p>\n<p>Calculate $A-B$:</p>\n<p style=\"text-align: center;\">$A-B=$ [[0]]</p>\n<p style=\"text-align: center;\"></p>\n<p style=\"text-align: center;\"></p>\n<p style=\"text-align: center;\"></p>\n<p style=\"text-align: center;\"></p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp;</p>", "gaps": [{"type": "matrix", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "correctAnswer": "{A}-{A2}", "correctAnswerFractions": false, "numRows": "{n1}", "numColumns": "{m1}", "allowResize": false, "tolerance": 0, "markPerCell": false, "allowFractions": false, "minColumns": 1, "maxColumns": 0, "minRows": 1, "maxRows": 0, "prefilledCells": ""}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Let:</p>\n<p>$$<br/>C=\\var{B}, D=\\var{B2}<br/>$$</p>\n<p>Calculate $C-D$:&nbsp;</p>\n<p style=\"text-align: center;\">$C-D=$ [[0]]</p>", "gaps": [{"type": "matrix", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "correctAnswer": "{B}-{B2}", "correctAnswerFractions": false, "numRows": "{n2}", "numColumns": "{m2}", "allowResize": false, "tolerance": 0, "markPerCell": false, "allowFractions": false, "minColumns": 1, "maxColumns": 0, "minRows": 1, "maxRows": 0, "prefilledCells": ""}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Let:</p>\n<p>$$<br/>E=\\var{C}, F=\\var{C2}<br/>$$</p>\n<p>Calculate $E-F$:</p>\n<p style=\"text-align: center;\">$E-F=$ [[0]]</p>", "gaps": [{"type": "matrix", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "correctAnswer": "{C}-{C2}", "correctAnswerFractions": false, "numRows": "{n3}", "numColumns": "{m3}", "allowResize": false, "tolerance": 0, "markPerCell": false, "allowFractions": false, "minColumns": 1, "maxColumns": 0, "minRows": 1, "maxRows": 0, "prefilledCells": ""}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Let:</p>\n<p>$$<br/>G=\\var{D}, H=\\var{D2}<br/>$$</p>\n<p>Calculate $G-H$:</p>\n<p style=\"text-align: center;\">$G-H=$ [[0]]</p>", "gaps": [{"type": "matrix", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "correctAnswer": "{D}-{D2}", "correctAnswerFractions": false, "numRows": "{n4}", "numColumns": "{m4}", "allowResize": false, "tolerance": 0, "markPerCell": false, "allowFractions": false, "minColumns": 1, "maxColumns": 0, "minRows": 1, "maxRows": 0, "prefilledCells": ""}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Let:</p>\n<p>$$<br/>I=\\var{EE}, J=\\var{EE2}<br/>$$</p>\n<p>Calculate $I-J$:</p>\n<p style=\"text-align: center;\">$I-J=$ [[0]]</p>", "gaps": [{"type": "matrix", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "correctAnswer": "{EE}-{EE2}", "correctAnswerFractions": false, "numRows": "{n5}", "numColumns": "{m5}", "allowResize": false, "tolerance": 0, "markPerCell": false, "allowFractions": false, "minColumns": 1, "maxColumns": 0, "minRows": 1, "maxRows": 0, "prefilledCells": ""}], "sortAnswers": false}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "type": "question", "contributors": [{"name": "Michael Proudman", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/269/"}, {"name": "Tamsin Smith", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/14108/"}, {"name": "Fraser Buxton", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/24224/"}]}]}], "contributors": [{"name": "Michael Proudman", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/269/"}, {"name": "Tamsin Smith", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/14108/"}, {"name": "Fraser Buxton", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/24224/"}]}