// Numbas version: exam_results_page_options
{"name": "Arbitrary constant of integration", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"preamble": {"css": "", "js": ""}, "functions": {}, "variables": {}, "metadata": {"description": "<p>The student must perform an indefinite integration, and include a constant of integration.<br></p><p>A custom marking algorithm identifies the name of the student's constant of integration, and replaces it with 'c' before comparing with the expected answer.</p><p>If the student enters something like '2c' instead of 'c', it'll be marked wrong, which is an error in the marking.<br></p>", "licence": "Creative Commons Attribution 4.0 International"}, "name": "Arbitrary constant of integration", "rulesets": {}, "ungrouped_variables": [], "variable_groups": [], "tags": [], "statement": "", "advice": "", "parts": [{"variableReplacementStrategy": "originalfirst", "checkingType": "absdiff", "checkingAccuracy": 0.001, "useCustomName": false, "customMarkingAlgorithm": "free_variables:\n  set(findvars(studentExpr)) - set(\"x\")\n\nstudent_constant (The student's constant of integration):\n  switch(\n    len(free_variables)=0,\n      fail(\"You might have forgotten to add a constant of integration.\")\n  , len(free_variables)=1,\n      free_variables[0]\n  , \n      fail(\"Your answer has too many free variables\")\n  )\n\nstudentCompare:\n  replace(student_constant,\"c\",studentExpr)", "checkVariableNames": false, "extendBaseMarkingAlgorithm": true, "vsetRangePoints": 5, "variableReplacements": [], "showFeedbackIcon": true, "answer": "x^2+c", "marks": 1, "scripts": {}, "showCorrectAnswer": true, "failureRate": 1, "vsetRange": [0, 1], "unitTests": [], "valuegenerators": [{"name": "c", "value": ""}, {"name": "x", "value": ""}], "customName": "", "prompt": "<p>$\\int x \\, \\mathrm{d}x =$</p>", "showPreview": true, "type": "jme"}], "extensions": [], "variablesTest": {"condition": "", "maxRuns": 100}, "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/7/"}]}]}], "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/7/"}]}