--- loncom/html/adm/help/tex/Problem_LON-CAPA_Functions.tex	2018/06/06 18:40:08	1.34
+++ loncom/html/adm/help/tex/Problem_LON-CAPA_Functions.tex	2018/09/12 22:00:19	1.35
@@ -50,6 +50,10 @@ erf = 2/sqrt(pi) integral (0,x) et-sq an
 
 \$expr=\&math_calculus_expression() & Creates Math::Calculus::Expression object.  Methods are: \$expr->addVariable('x'), \$expr->setExpression('f(x)'), \$expr->simplify, \$expr->getExpression -- see Math::Calculus::Expression documentation at cpan.org for details.\\
 \hline
+
+(\$a,\$u)=\&conv_eng_format(\$x,\$b) & Converts numerical value \$x and base unit \$b to answer \$a and corresponding unit \$u in engineering format, i.e.,
+the answer is scaled by powers of ten, and an appropriate prefix from: m u n p f a z y k M G T P E Z Y precedes the base unit. Called in a script block to generate variables to assign to answer and unit attributes of numericalresponse tag. \\
+\hline
  
 \&prettyprint(\$x,'nn','optional target') & Note that that tag $<$num$>$ can be used to do the same thing. Display or format \$x as nn where nn is nF or nE or nS and n is an integer. Also supports the first character being a \$, it then will format the result with a a call to \&dollarformat() described below. If the first character is a , it will format it with commas grouping the thousands. In S mode it will fromat the number to the specified number of significant figures and display it in F mode. In E mode it will attempt to generate a pretty x10\^{}3 rather than a E3 following the number, the 'optional target' argument is optional but can be used to force \&prettyprint to generate either 'tex' output, or 'web' output, most people do not need to specify this argument and can leave it blank.\\
 \hline