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/usr/share/ngraph-gtk/addin/math.nsc is in ngraph-gtk-addins 6.07.02-2build3.

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The actual contents of the file can be viewed below.

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# math.nsc written by S. ISHIZAKA. 1997/12
#
# Line-calculator using shell-builtin command "dexpr".
#
# Description: _Math...,calculator,

set +e
new dialog
MATH=""

while true
do
    dialog::caption='Input mathematical expression'
    MATH=`get dialog -field input:"$MATH"`
    if [ -z "$MATH" ]
    then
	break
    fi
    if result=`dexpr "$MATH"`
    then
	new text
	result=`get text -field printf:"%G $result"`
	del text
	dialog::message:"$MATH=$result"
	menu::echo:"Math: $MATH=$result"
	break
    fi
done

del dialog