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+<div name="index">
+<p><a name="__index__"></a></p>
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<ul>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#author">AUTHOR</a></li>
</ul>
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<p>
one run. Note, that currently <strong>VDEF</strong> instructions only support a limited
list of functions.</p>
<p>Example: <code>VDEF:maximum=mydata,MAXIMUM</code></p>
-<p>This will set variable ``maximum'' which you now can use in the rest
+<p>This will set variable "maximum" which you now can use in the rest
of your RRD script.</p>
<p>Example: <code>CDEF:mydatabits=mydata,8,*</code></p>
<p>This means: push variable <em>mydata</em>, push the number 8, execute
<hr />
<h1><a name="operators">OPERATORS</a></h1>
<dl>
-<dt><strong><a name="item_boolean_operators">Boolean operators</a></strong></dt>
+<dt><strong><a name="boolean_operators" class="item">Boolean operators</a></strong></dt>
<dd>
<p><strong>LT, LE, GT, GE, EQ, NE</strong></p>
<p>Example: <code>A,B,C,IF</code> should be read as <code>if (A) then (B) else (C)</code></p>
<p></p>
</dd>
-<dt><strong><a name="item_comparing_values">Comparing values</a></strong></dt>
+<dt><strong><a name="comparing_values" class="item">Comparing values</a></strong></dt>
<dd>
<p><strong>MIN, MAX</strong></p>
alpha is lower than 0 or if it is higher than 100.</p>
<p></p>
</dd>
-<dt><strong><a name="item_arithmetics">Arithmetics</a></strong></dt>
+<dt><strong><a name="arithmetics" class="item">Arithmetics</a></strong></dt>
<dd>
<p><strong>+, -, *, /, %</strong></p>
<p><strong>ABS</strong></p>
<p>Take the absolute value.</p>
</dd>
-<dt><strong><a name="item_set_operations">Set Operations</a></strong></dt>
+<dt><strong><a name="set_operations" class="item">Set Operations</a></strong></dt>
<dd>
<p><strong>SORT, REV</strong></p>
average, ignoring all UNKNOWN values in the process.</p>
<p>Example: <code>CDEF:x=a,b,c,d,4,AVG</code></p>
<p><strong>TREND, TRENDNAN</strong></p>
-<p>Create a ``sliding window'' average of another data series.</p>
+<p>Create a "sliding window" average of another data series.</p>
<p>Usage:
CDEF:smoothed=x,1800,TREND</p>
<p>This will create a half-hour (1800 second) sliding window average of x. The
operation ignores all NAN-values in a sliding window and computes the
average of the remaining values.</p>
</dd>
-<dt><strong><a name="item_special_values">Special values</a></strong></dt>
+<dt><strong><a name="special_values" class="item">Special values</a></strong></dt>
<dd>
<p><strong>UNKN</strong></p>
you to make calculations based on the position of the value within
the data set. This function cannot be used in <strong>VDEF</strong> instructions.</p>
</dd>
-<dt><strong><a name="item_time">Time</a></strong></dt>
+<dt><strong><a name="time" class="item">Time</a></strong></dt>
<dd>
<p>Time inside RRDtool is measured in seconds since the epoch. The
it, and pushes the result on the stack. There is an elaborate example
in the examples section below on how to use this.</p>
</dd>
-<dt><strong><a name="item_processing_the_stack_directly">Processing the stack directly</a></strong></dt>
+<dt><strong><a name="processing_the_stack_directly" class="item">Processing the stack directly</a></strong></dt>
<dd>
<p><strong>DUP, POP, EXC</strong></p>
<h1><a name="variables">VARIABLES</a></h1>
<p>These operators work only on <strong>VDEF</strong> statements. Note that currently ONLY these work for <strong>VDEF</strong>.</p>
<dl>
-<dt><strong><a name="item_maximum_2c_minimum_2c_average">MAXIMUM, MINIMUM, AVERAGE</a></strong></dt>
+<dt><strong><a name="maximum_minimum_average" class="item">MAXIMUM, MINIMUM, AVERAGE</a></strong></dt>
<dd>
<p>Return the corresponding value, MAXIMUM and MINIMUM also return
the first occurrence of that value in the time component.</p>
<p>Example: <code>VDEF:avg=mydata,AVERAGE</code></p>
</dd>
-<dt><strong><a name="item_stdev">STDEV</a></strong></dt>
+<dt><strong><a name="stdev" class="item">STDEV</a></strong></dt>
<dd>
<p>Returns the standard deviation of the values.</p>
<p>Example: <code>VDEF:stdev=mydata,STDEV</code></p>
</dd>
-<dt><strong><a name="item_last_2c_first">LAST, FIRST</a></strong></dt>
+<dt><strong><a name="last_first" class="item">LAST, FIRST</a></strong></dt>
<dd>
<p>Return the last/first value including its time. The time for
LAST returns the end of the corresponding interval.</p>
<p>Example: <code>VDEF:first=mydata,FIRST</code></p>
</dd>
-<dt><strong><a name="item_total">TOTAL</a></strong></dt>
+<dt><strong><a name="total" class="item">TOTAL</a></strong></dt>
<dd>
<p>Returns the rate from each defined time slot multiplied with the
the number of seconds.</p>
<p>Example: <code>VDEF:total=mydata,TOTAL</code></p>
</dd>
-<dt><strong><a name="item_percent">PERCENT</a></strong></dt>
+<dt><strong><a name="percent" class="item">PERCENT</a></strong></dt>
<dd>
<p>This should follow a <strong>DEF</strong> or <strong>CDEF</strong> <em>vname</em>. The <em>vname</em> is popped,
(NaN < -INF < finite values < INF)</p>
<p>Example: <code>VDEF:perc95=mydata,95,PERCENT</code></p>
</dd>
-<dt><strong><a name="item_lslslope_2c_lslint_2c_lslcorrel">LSLSLOPE, LSLINT, LSLCORREL</a></strong></dt>
+<dt><strong><a name="lslslope_lslint_lslcorrel" class="item">LSLSLOPE, LSLINT, LSLCORREL</a></strong></dt>
<dd>
<p>Return the parameters for a <strong>L</strong>east <strong>S</strong>quares <strong>L</strong>ine <em>(y = mx +b)</em>