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diff --git a/doc/rrdgraph_rpn.1 b/doc/rrdgraph_rpn.1
index c765dddb3c774c57396ac6dd4fb9cd6d3c76b783..a9ca9c63233b81a3f3632c7fba9a1c2c0aef32d4 100644 (file)
--- a/doc/rrdgraph_rpn.1
+++ b/doc/rrdgraph_rpn.1
-.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14
+.\" Automatically generated by Pod::Man 2.1801 (Pod::Simple 3.08)
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+.\"
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-.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
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.IX Title "RRDGRAPH_RPN 1"
-.TH RRDGRAPH_RPN 1 "2009-02-21" "1.3.99909060808" "rrdtool"
+.TH RRDGRAPH_RPN 1 "2009-06-09" "1.3.999" "rrdtool"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
.SH "NAME"
rrdgraph_rpn \- About RPN Math in rrdtool graph
.SH "SYNOPSIS"
.Sp
Example: \f(CW\*(C`A,B,C,IF\*(C'\fR should be read as \f(CW\*(C`if (A) then (B) else (C)\*(C'\fR
.Sp
-\&\&
+
.IP "Comparing values" 4
.IX Item "Comparing values"
\&\fB\s-1MIN\s0, \s-1MAX\s0\fR
Example: \f(CW\*(C`CDEF:a=alpha,0,100,LIMIT\*(C'\fR will return \fIunknown\fR if
alpha is lower than 0 or if it is higher than 100.
.Sp
-\&\&
+
.IP "Arithmetics" 4
.IX Item "Arithmetics"
\&\fB+, \-, *, /, %\fR
\& <\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->
\& delay t2
\& <\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->
-.Ve
-.Sp
-.Vb 3
+\&
+\&
\& Value at sample (t0) will be the average between (t0\-delay) and (t0)
\& Value at sample (t1) will be the average between (t1\-delay) and (t1)
\& Value at sample (t2) will be the average between (t2\-delay) and (t2)
.Ve
.Sp
-\&\s-1TRENDNAN\s0 is \- in contrast to \s-1TREND\s0 \- NAN\-safe. If you use \s-1TREND\s0 and one
+\&\s-1TRENDNAN\s0 is \- in contrast to \s-1TREND\s0 \- NAN-safe. If you use \s-1TREND\s0 and one
source value is \s-1NAN\s0 the complete sliding window is affected. The \s-1TRENDNAN\s0
operation ignores all NAN-values in a sliding window and computes the
average of the remaining values.
This will create a half-hour (1800 second) sliding window average/sigma of x, that
average is essentially computed as shown here:
.Sp
-.Vb 18
+.Vb 10
\& +\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\-!\-\-\->
\& now
\& shift 1 t0
\& <\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->
\& window
\& <\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->
-.Ve
-.Sp
-.Vb 4
+\&
\& Value at sample (t0) will be the average between (t0\-shift1\-window) and (t0\-shift1)
\& and between (t0\-shift2\-window) and (t0\-shift2)
\& Value at sample (t1) will be the average between (t1\-shift1\-window) and (t1\-shift1)
\& and between (t1\-shift2\-window) and (t1\-shift2)
.Ve
.Sp
-The function is by design NAN\-safe.
+The function is by design NAN-safe.
This also allows for extrapolation into the future (say a few days)
\&\- you may need to define the data series whit the optional start= parameter, so that
the source data series has enough data to provide prediction also at the beginning of a graph...
.IP "Time" 4
.IX Item "Time"
Time inside RRDtool is measured in seconds since the epoch. The
-epoch is defined to be \f(CW\*(C`Thu\ Jan\ 1\ 00:00:00\ UTC\ 1970\*(C'\fR.
+epoch is defined to be \f(CW\*(C`Thu\ Jan\ \ 1\ 00:00:00\ UTC\ 1970\*(C'\fR.
.Sp
\&\fB\s-1NOW\s0\fR
.Sp
Duplicate the top element, remove the top element, exchange the two
top elements.
.Sp
-\&\&
+
.SH "VARIABLES"
.IX Header "VARIABLES"
These operators work only on \fB\s-1VDEF\s0\fR statements. Note that currently \s-1ONLY\s0 these work for \fB\s-1VDEF\s0\fR.
y\-intercept \fI(b)\fR, which happens also to be the first data point on the
graph. \s-1LSLCORREL\s0 is the Correlation Coefficient (also know as Pearson's
Product Moment Correlation Coefficient). It will range from 0 to +/\-1
-and represents the quality of fit for the approximation.
+and represents the quality of fit for the approximation.
.Sp
Example: \f(CW\*(C`VDEF:slope=mydata,LSLSLOPE\*(C'\fR
.SH "SEE ALSO"