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<H1><A NAME="SECTION02050000000000000000"></A>
<A NAME="backwards_compatibility"></A><A NAME="compatibility"></A><A NAME="235"></A>
<BR>
Backwards compatibility
</H1>
Gnuplot version 4.0 deprecated certain syntax used in earlier versions, but
continued to recognize it. This is now under the control of a configuration
option, and can be disabled as follows:
<P>
<BR>
<PRE>
./configure --disable-backwards-compatibility
</PRE>
<BR>
<P>
Notice: Deprecated syntax items may be disabled permanently in some future
version of gnuplot.
<P>
One major difference is the introduction of keywords to disambiguate complex
commands, particularly commands containing string variables. A notable issue
was the use of bare numbers to specify offsets, line and point types.
Illustrative examples:
<P>
Deprecated:
<BR>
<PRE>
set title "Old" 0,-1
set data linespoints
plot 1 2 4 # horizontal line at y=1
</PRE>
<BR>
New:
<BR>
<PRE>
TITLE = "New"
set title TITLE offset char 0, char -1
set style data linespoints
plot 1 linetype 2 pointtype 4
</PRE>
<BR>
<P>
<BR><HR>
<ADDRESS>
2010-08-17
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