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| [https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type] | | #REDIRECT [[Formulas:_Editing]] |
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| The page for editing a Formulas question is shown in the figure below. The main settings, indicated by orange arrows, are described in order. Note that ''global'' settings affect the entire question, while ''local'' settings affect only each part. Parameters marked with an asterisk must be defined.
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| [[File:Editing a formulas question .png|600px|thumb|center]]
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| ==Random variables==
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| Random values can be generated each time a question is created. This is done by defining a set of values to choose from, for example:
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| <pre style="font-size:113%;">
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| A = {1,2,3};
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| C = {[1,-1], [2,-2], [3,-3]};
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| E = {10:100:10, 100, 1000};
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| </pre>
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| Values can be numbers, strings, lists of numbers, or lists of strings. At the beginning of a quiz, a value is taken in the set and assigned to the variable. Range notation may be used for sets of numbers, e.g. <span style="font-family:monospace;font-size:113%;">10:100:10</span> (=<span style="font-family:monospace;font-size:113%;">[10,20,30,40,50,60,70,80,90]</span>).
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| ==Global variables==
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| Formulas can be specified here to manipulate instantiated random variables (all random variables are included here) and define global variables. The complete list of mathematical functions and operations is given in the '''Reference'''. | |
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| Examples:
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| <pre style="font-size:113%;">
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| a = 1.11111;
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| b = exp(3);
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| c = A + a + b;
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| d = sin(1.5*pi()) + c;
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| e = round(a, 0);
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| f = [0,1,2,3][A];
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| g = ["zero","one","two","three"][A];
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| distance = sqrt(a*a + b*b);
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| </pre>
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| ==Question text*==
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| In addition to the main question text, you can also use global variables and placeholder here.
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| The global variables will be replaced by their values and the placeholders will be replaced by the subquestion. A simple example with variables <span style="font-family:monospace;font-size:113%;">A</span>, <span style="font-family:monospace;font-size:113%;">B</span>, <span style="font-family:monospace;font-size:113%;">C</span> and placeholders <span style="font-family:monospace;font-size:113%;">#1</span>, <span style="font-family:monospace;font-size:113%;">#2</span>, <span style="font-family:monospace;font-size:113%;">#3</span> is shown below:
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| <pre style="font-size:113%;">
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| What is the result of {A} + {B}? {#1}
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| What is the result of {A} - {B}? {#2}
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| What is the result of {C} / {B}? {#3}
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| </pre>
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| ==Part's mark*==
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| ==Local variables==
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| ==Answer type==
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| ==Answer*==
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| ==Grading variables==
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| ==Grading criteria*==
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| ==Unit==
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| ==Other rules==
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| ==Placeholder name==
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| ==Part's text==
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| ==[Global] - Deduction for wrong unit (0-1)==
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| This option specify how penalties are applied for a wrong unit. It uses a value between 0 to 1. If the value is 1, both answer and unit must be correct at the same time in order to get mark. That is, the answer and the unit are treated as one entity. If the value is 0, students can get full mark for only the correct answer and all random strings at the end of answer will have no effect.
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| ==[Global] - Basic conversion rules==
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| The Formulas question type has a build-in unit conversion system and has basic conversion rules. The basic system is the '''Common SI units''' which converts standard units, for example those for length (km, m, cm and mm). This option has no effect if no unit is used.
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| ==Trial mark sequence==
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| This option has effect only in the adaptive mode. It will override the behavior of penalty in adaptive mode. The default behavior of adaptive mode always has infinite trial and deducts equal marks for each wrong trial. With this option, both finite trials or infinite trials can be used. For finite trials, say, you want to have three trials, the first one has 100%, second one has 60% and third one has 20%, you can type:
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| <pre style="font-size:113%;">1.00, 0.6, 0.2</pre>
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| If you want to have infinite trials, each with 10% penalty, you can end the sequence by a comma:
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| <pre style="font-size:113%;">1, 0.9,</pre>
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| [https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type]
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