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Diff for /loncom/html/adm/help/tex/Formula_Response_Sampling.tex between versions 1.2 and 1.3

version 1.2, 2002/07/18 15:52:27 version 1.3, 2005/02/18 20:30:52
Line 5  is exactly equal to another expression i Line 5  is exactly equal to another expression i
 Symbolically proving it one way or another is impossible in general. Therefore,  Symbolically proving it one way or another is impossible in general. Therefore,
 LON-CAPA uses a sampling system. If your answer and the student's answer  LON-CAPA uses a sampling system. If your answer and the student's answer
 agree at the sampling points within your given tolerance factor, the student's  agree at the sampling points within your given tolerance factor, the student's
 answer will be accepted, otherwise it will be rejected.  answer will be accepted. If the student's answer does not agree at the sampling points within your given tolerance factor, it will be rejected.
   
 To specify where to sample the formulas for determining whether the student's  To specify where to sample the formulas for determining whether the student's
 answer is correct, you need to put a sampling specification in the \textbf{Sample  answer is correct, you need to put a sampling specification in the \textbf{Sample
 Points}\index{Sample Points} field. The sampling specifications takes the  Points}\index{Sample Points} field. The sampling specifications take the
 following format:  following format:
   
 \begin{enumerate}  \begin{enumerate}
 \item A comma separated list of the variables you wish to interpret,  \item A comma-separated list of the variables you wish to interpret,
 \item followed by {}``@'' (not in quotes),  \item followed by {}``@'' (not in quotes),
 \item followed by any number of the following two things, separated by semi-colons:  \item followed by any number of the following two things, separated by semi-colons:
   
 \begin{enumerate}  \begin{enumerate}
 \item a comma separated list of as many numbers as there are variables, which specifies  \item a comma-separated list of as many numbers as there are variables, which specifies
 one sampling point, OR  one sampling point, OR
 \item a comma separated list of as many numbers as there are variables, followed  \item a comma-separated list of as many numbers as there are variables, followed
 by a colon, followed by another list of as many numbers as there are variables,  by a colon, followed by another list of as many numbers as there are variables,
 followed by a \#, followed by an integer.  followed by a \#, followed by an integer.
 \end{enumerate}  \end{enumerate}
Line 29  The first form specifies one point to sa Line 29  The first form specifies one point to sa
 range for each variable, and the system will take as many random samples  range for each variable, and the system will take as many random samples
 from that range as the number after the \#.  from that range as the number after the \#.
   
 For $2x^{2}+4$, with one variable {}``x'', one could specify  For $2x^{2}+4$, with one variable {}``x'', one could specify:
   
 \begin{itemize}  \begin{itemize}
 \item {}``x@2'', which will sample the answers only at 2. (This is generally  \item {}``x@2'', which will sample the answers only at 2. (This is generally
Line 38  a bad idea, as the student could get luc Line 38  a bad idea, as the student could get luc
 \item {}``x@1:5\#4;10'' will takes 4 samples from somewhere between 1 and 5,  \item {}``x@1:5\#4;10'' will takes 4 samples from somewhere between 1 and 5,
 and also sample at 10.  and also sample at 10.
 \end{itemize}  \end{itemize}
 For $2x^{2}+3y^{3}$, which has two variables, one could specify  For $2x^{2}+3y^{3}$, which has two variables, one could specify:
   
 \begin{itemize}  \begin{itemize}
 \item {}``x,y@4,5:10,12\#4;0,0'', which take four samples from the box determined  \item {}``x,y@4,5:10,12\#4;0,0'', which take four samples from the box determined
Removed from v.1.2  
changed lines
  Added in v.1.3

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