"Expression" (Comparison Method)
Details
- The "Expression" comparison method compares submitted answers to values in the answer key using pattern matching.
- Symbolic structures including pattern objects like Blank are valid pattern forms in the answer key. During assessment, submitted answers are compared with the answer key values using MatchQ .
- "Expression" is the default comparison method when no other comparison method is specified or automatically inferred from the AssessmentFunction .
Examples
open allclose allBasic Examples (2)
Create an AssessmentFunction using arbitrary expressions to define multiple correct answers:
Answers matching any value in the key are marked as correct:
Any other answer is incorrect:
Create an AssessmentFunction with numeric values compared as expressions:
Equivalent numeric answers are marked as incorrect because they do not match as expressions:
Scope (1)
Create an test for a pattern test and award two points for a correct answer:
See the score for a correct answer:
Applications (5)
Multiple choice questions can always use the "Expression" comparison method because the possible answers are predefined:
Create a multiple-choice QuestionGenerator with an "Expression" comparison:
Generate three QuestionObject examples from the generator:
Create a "MultipleShortAnswers" question with "Expression" comparison. The interpreter standardizes the submitted answers:
Create a grammar test, treating strings as expressions:
Create a "DragCompletion" question comparing Entity values as expressions:
Properties & Relations (4)
"Expression" is the default comparison method when answer keys do not match special built-in comparison methods:
When the key matches a special method, that method is inferred automatically:
Specify "Expression" to force the method:
Use Information to check the comparison method of an AssessmentFunction :
Assess an answer that matches multiple values in the answer key of an "Expression" comparison:
The first matching value in the answer key is used for assessment:
With the setting "ListAssessment""SeparatelyScoreElements", repeated answers are only compared against each value in the answer key once:
The first matching value in the answer key is used for assessment:
See Also
AssessmentFunction QuestionObject MatchQ
Question Interface Types: ShortAnswer MultipleShortAnswers DragCompletion SelectCompletion Sort TextCompletion
Comparison Methods: HeldExpression CodeEquivalence
Tech Notes
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- Patterns