# moodle/moodle mirrored from git://git.moodle.org/moodle.git

First german translation

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1 parent d1226df commit 4e15e4638f7475b37b0271d7bb378f89c8c0484a ralf-bonn committed Jan 15, 2005
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Berechnete Fragen

+Calculated questions offers a way to create individual numerical +question by the use of wildcards that are substituted with +individual values when the quiz is taken.
+Below is a shrunken view of the main editing page with some +example inputs:
+ +
+

Question:

+
+
+

Image to display:

+
+

Correct Answer Formula:

+

+

Tolerance:

+
±
+

Tolerance Type:

+
+

Significant Figures:

+
+ + + + + + + + + + + + + + + + + + + + + + + + + + +
+In the question text input and "Correct Answer Formula" {a} and +{b} can be seen. These and any other {name} can be used as a +wildcard that is substituted by some value when the quiz is +taken. Also, the correct answer is calculated when the quiz is +submitted using the expression in "Correct Answer Formula", which +is calculated as a numerical expression after the substitution of +the wildcards. The possible wildcard values are set or generated +on a later page in "editing wizard" for calculated +questions...
+The example formula uses the operator +. Other accepted operators +are -*/ and % where % is the modulo operator. It is also possible +to use some PHP-style mathematical function. Among these there +are 24 single-argument function:
+abs, acos, acosh, asin, asinh, atan, atanh, ceil, cos, cosh, +deg2rad, exp, expm1, floor, log, log10, log1p, rad2deg, round, +sin, sinh, sprt, tan, tanh
+and two two-argument functions
+atan2, pow
+and the functions min and max that can take two or +more arguments. It is also possible to use the function pi +that takes no arguments but do not forget the use the parentheses +- the correct usage is pi(). Similary the other function +must have their argument(s) within parentheses. Possible usage is +for example sin({a}) + cos({b}) * 2. It should not be any +problem to wrap functions within eachother like +cos(deg2rad({a} + 90)) etc.
+More details on how to use these PHP-style functions can be found +in the documentation at the +PHP web site
+
+As for numerical questions it is possible to allow a margin +within which all responses are accepted as correct. The +"Tolerance" field is used for this. However, there are three +different types of tolerances. These are Relative, Nominal and +Geometric. If we say that the correct answer at quiz time is +calculated to 200 and the tolerance is set to 0.5 then the +different tolerance types work like this:
+
+Relative: A tolerance interval is calculated by +multiplying the correct answer with 0.5, ie in this case we get +100 so for this tolerance the correct response must be between +100 and 300. (200 ± 100)
+This is useful if the magnitude of the correct answer can differ +greatly between different wildcard values.
+
+Nominal: This is the simpliest tolerance type but not very +powerful. The correct response must be between 199.5 and 200.5 +(200 ± 0.5)
+This tolerance type can be useful if the differences between +different correct answers are small.
+
+Geometric: The upper limit of the tolerance interval is +calculated as 200 + 0.5*200 and is the same as for the relative +case. The lower limit is calculated as 200/(1 + 0.5). The correct +response must then be between 133.33 and 300.
+This is useful for complex calculation that must have great +tolerances where relative tolerances of 1 or more would be used +for the upper limit but clearly not acceptable for the lower +limit as it would make zero a correct answer for all cases.
+
+The field Significant Figures does only relate to how the +correct answer should be presented in the review or the reports. +Examples: If it is set to 3 then the correct answer 13.333 would +be presented as 13.3; 1236 would be presented as 1240; 23 would +be presented as 23.0 etc.
+
+The feedback field and the optional unit fields work just like +they do for numerical questions.
+ +

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