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<p><strong>LT, LE, GT, GE, EQ, NE</strong></p>
<p>Pop two elements from the stack, compare them for the selected condition
and return 1 for true or 0 for false. Comparing an <em>unknown</em> or an
-<em>infinite</em> value will always result in 0 (false).</p>
+<em>infinite</em> value will result in <em>unknown</em> returned ... which will also be
+treated as false by the <strong>IF</strong> call.</p>
<p><strong>UN, ISINF</strong></p>
<p>Pop one element from the stack, compare this to <em>unknown</em> respectively
to <em>positive or negative infinity</em>. Returns 1 for true or 0 for false.</p>
CDEF:exceeds=value,UN,0,value,lower,upper,LIMIT,UN,IF \
TICK:exceeds#aa000080:1</p>
<p>Note: Experience has shown that a factor between 3 and 5 to scale sigma is a good
-discriminator to detect abnormal behaviour. This obviously depends also on the type
+discriminator to detect abnormal behavior. This obviously depends also on the type
of data and how "noisy" the data series is.</p>
<p>This prediction can only be used for short term extrapolations - say a few days into the future-</p>
</dd>
<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
-FIRST is actually the start of the corresponding interval, whereas
-LAST returns the end of the corresponding interval.</p>
+<p>Return the last/first non-nan or infinite value for the selected data
+stream, including its timestamp.</p>
<p>Example: <code>VDEF:first=mydata,FIRST</code></p>
</dd>
<dt><strong><a name="total" class="item">TOTAL</a></strong></dt>
<dd>
<p>Returns the rate from each defined time slot multiplied with the
-step size. This can, for instance, return total bytes transfered
+step size. This can, for instance, return total bytes transferred
when you have logged bytes per second. The time component returns
the number of seconds.</p>
<p>Example: <code>VDEF:total=mydata,TOTAL</code></p>