{
    "source": {
        "author": {
            "name": "Christian Lawson-Perfect"
        }
    },
    "name": "Give a numerical input for an expression",
    "short_name": "give-a-numerical-input-for-an-expression",
    "description": "<p>The student gives&nbsp;a point $x$ at which to evaluate a given function $f$. The answer is correct if $f(x)$ is the expected value.</p>",
    "help_url": "",
    "input_widget": "number",
    "input_options": {
        "correctAnswer": "settings[\"correctAnswer\"]",
        "hint": {
            "static": true,
            "value": ""
        },
        "allowedNotationStyles": {
            "static": true,
            "value": [
                "plain",
                "en",
                "si-en"
            ]
        },
        "allowFractions": {
            "static": true,
            "value": true
        }
    },
    "can_be_gap": true,
    "can_be_step": true,
    "marking_script": "mark:\nif(equal,\n   correct()\n,\n   incorrect(settings[\"student_value_description\"]+\" $\"+student_value+\"$.\")\n)\n\ninterpreted_answer:\nstudentAnswer\n\nstudent_value:\neval(settings[\"expression\"],[\"x\":studentAnswer])\n\nequal:\nwithintolerance(student_value,settings[\"expected_value\"],0.00001)",
    "marking_notes": [
        {
            "name": "mark",
            "description": "This is the main marking note. It should award credit and provide feedback based on the student's answer.",
            "definition": "if(equal,\n   correct()\n,\n   incorrect(settings[\"student_value_description\"]+\" $\"+student_value+\"$.\")\n)"
        },
        {
            "name": "interpreted_answer",
            "description": "A value representing the student's answer to this part.",
            "definition": "studentAnswer"
        },
        {
            "name": "student_value",
            "description": "",
            "definition": "eval(settings[\"expression\"],[\"x\":studentAnswer])"
        },
        {
            "name": "equal",
            "description": "",
            "definition": "withintolerance(student_value,settings[\"expected_value\"],0.00001)"
        }
    ],
    "settings": [
        {
            "name": "expected_value",
            "label": "Expected value",
            "help_url": "",
            "hint": "The value that the function should take at the given point.",
            "input_type": "code",
            "default_value": "",
            "evaluate": true
        },
        {
            "name": "correctAnswer",
            "label": "Correct answer",
            "help_url": "",
            "hint": "The value that the student should write.",
            "input_type": "string",
            "default_value": "",
            "subvars": true
        },
        {
            "name": "student_value_description",
            "label": "Description of the student's value",
            "help_url": "",
            "hint": "",
            "input_type": "string",
            "default_value": "The value at your point is",
            "subvars": true
        },
        {
            "name": "expression",
            "label": "Function to evaluate",
            "help_url": "",
            "hint": "The function that will be applied to the student's number.<br />The student's number will be substituted for $x$ in this expression.",
            "input_type": "mathematical_expression",
            "default_value": "",
            "subvars": true
        }
    ],
    "public_availability": "always",
    "published": true,
    "extensions": []
}