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| {{Formulas question type}}
| | #REDIRECT [[Formulas_question_type]] |
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| ==Significant figures==
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| ''"The significant figures of a number are digits that carry meaning contributing to its measurement resolution."'' (Reference: https://en.wikipedia.org/wiki/Significant_figures).
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| The Formulas question has no built-in function to display numbers with a given number of significant figures. However, it is easy to work out this function as the following variable assignment which works with any real number:
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| <pre style="font-size:113%;width: 98%;">
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| xr=x==0?x:round(x*pow(10,nsf-1-floor(log10(abs(x)))),0)*pow(10,-nsf+1+floor(log10(abs(x))));
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| </pre>
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| where <span style="font-family: monospace;font-size:113%;">x</span> is the number to be rounded, <span style="font-family: monospace;font-size:113%;">nsf</span> the number of significant digits to keep and <span style="font-family: monospace;font-size:113%;">xr</span> the resulting rounded value.
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| <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;">
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| <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div>
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| This example deals with the display of the correct answers with different numbers of significant figures.
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| The Formulas question should look like this:
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| [[File:Formulas201712310126.png|680px]]
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| <div style="margin:20px 0 20px;">
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| [http://35.193.77.29/mod/quiz/view.php?id=153<span style="background-color:#f98012;box-shadow: 0 5px 10px #cbcbcb;border: none;color:white;padding: 8px 16px;text-align:center;text-decoration: none;cursor:pointer;">Play it</span>] [[Formulas_question_type#Examples|Login info]] ''(Open in new tab: Ctrl+Shift+Click)''
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| </div>
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| </div>
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| <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;">
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| <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div>
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| This example is a significant figures drill.
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| <pre style="font-size:113%;width: 98%;">
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| General
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| Question name* Significant figures drill
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| Variables
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| Random variables a=a={-1,1};
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| b={-4:4.01:0.01};
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| ncs={2,3,4};
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| Main question
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| Question text* With part's text placeholders
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| Two subquestions on addition:
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| {#1a}
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| {#1b}
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| One subquestion on subtraction:
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| {#2}
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| Part 1
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| Part's mark* 1
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| Answer type Number
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| Answer* 7
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| Grading criteria* Absolute error == 0
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| Placeholder name #1a
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| Part's text What is 3 + 4?
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| Part 2
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| Part's mark* 1
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| Answer type Number
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| Answer* 9
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| Grading criteria* Absolute error == 0
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| Placeholder name #1b
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| Part's text What is 4 + 5?
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| Part 3
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| Part's mark* 1
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| Answer type Number
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| Answer* 3
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| Grading criteria* Absolute error == 0
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| Placeholder name #2
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| Part's text What is 9 − 6?
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| </pre>
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| The Formulas question should look like this:
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| [[File:Formulas201712301427.png|680px]]
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| <div style="margin:20px 0 20px;">
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| [http://35.193.77.29/mod/quiz/view.php?id=152<span style="background-color:#f98012;box-shadow: 0 5px 10px #cbcbcb;border: none;color:white;padding: 8px 16px;text-align:center;text-decoration: none;cursor:pointer;">Play it</span>] [[Formulas_question_type#Examples|Login info]] ''(Open in new tab: Ctrl+Shift+Click)''
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| </div>
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| </div>
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| [[#top|Back to top of page]]
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| [[Formulas_question_type|← FORMULAS QUESTION TYPE]] | |
