# [LON-CAPA-cvs] cvs: loncom /html/adm/help/tex Tolerance.tex

albertel lon-capa-cvs@mail.lon-capa.org
Thu, 29 May 2003 20:30:51 -0000

albertel		Thu May 29 16:30:51 2003 EDT

Modified files:
Log:
- Fixes Bug #1313

--- loncom/html/adm/help/tex/Tolerance.tex:1.2	Thu Jul 18 11:52:27 2002
+++ loncom/html/adm/help/tex/Tolerance.tex	Thu May 29 16:30:51 2003
@@ -15,17 +15,25 @@
default too large for some problems.

There are
-two kinds of tolerance. For some answer $a$ and a tolerance $t$,
+three kinds of tolerance. For some answer $A$ and a tolerance $T$,

\begin{enumerate}
\item an \textbf{Absolute} tolerance\index{absolute tolerance}\index{tolerance, absolute}
-will take anything in the range $a\pm t$. So if $a=10$ and $t=2$, then
+will take anything in the range $A\pm T$. So if $A=10$ and $T=2$, then
anything between 8 and 12 is acceptable.
Any number in the tolerance field \emph{without} a \textbf{\%} symbol is
an absolute tolerance.
\item a \textbf{Relative} tolerance\index{relative tolerance}\index{tolerance, relative}
-will take anything in the range $a\pm at$, where \emph{t} is interpreted
-as a percentage. Any number in the tolerance field \emph{followed by} a \textbf{\%}
+will take anything in the range $A\pm aT$, where \emph{T} is interpreted
+as a percentage/100. Any number in the tolerance field \emph{followed by} a \textbf{\%}
symbol is a relative tolerance. For example, $a=10$ and $t=10\%$ will accept
anything between 9 and 11.
-\end{enumerate}
\ No newline at end of file
+
+\item a tolerance that is a calculated variable (identified by \$sign as +the first character). For example, if an answer is$\$X$,and for a student
+possible values range from $-\$X1$to$+\$X1$, you could choose $T = +\$tolerance = \$2X1/100;$ acceptable answers would then be from
+$\$X-\$tolerance$ to $\$X+\$tolerance$. (This is especially useful when answers
+close to zero are possible for some students)
+
+\end{enumerate}