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<title>The mcx q manual</title>
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<body>
<p style="text-align:right">
16 May 2014&nbsp;&nbsp;&nbsp;
<a class="local" href="mcxquery.ps"><b>mcx q</b></a>
14-137
</p>
<div class=" itemize " style="margin-top:1em; font-size:100%">
<div class=" item_compact"><div class=" item_rightalign nowrap " style="right:-3em">1.</div></div>
<div class=" item_text " style="margin-left:4em">
<a class="intern" href="#name">NAME</a>
</div>
<div class=" item_compact"><div class=" item_rightalign nowrap " style="right:-3em">2.</div></div>
<div class=" item_text " style="margin-left:4em">
<a class="intern" href="#synopsis">SYNOPSIS</a>
</div>
<div class=" item_compact"><div class=" item_rightalign nowrap " style="right:-3em">3.</div></div>
<div class=" item_text " style="margin-left:4em">
<a class="intern" href="#description">DESCRIPTION</a>
</div>
<div class=" item_compact"><div class=" item_rightalign nowrap " style="right:-3em">4.</div></div>
<div class=" item_text " style="margin-left:4em">
<a class="intern" href="#options">OPTIONS</a>
</div>
<div class=" item_compact"><div class=" item_rightalign nowrap " style="right:-3em">5.</div></div>
<div class=" item_text " style="margin-left:4em">
<a class="intern" href="#seealso">SEE ALSO</a>
</div>
</div>

<a name="name"></a>
<h2>NAME</h2>
<p style="margin-bottom:0" class="asd_par">
mcxquery &mdash; compute simple graph statistics</p>

<a name="synopsis"></a>
<h2>SYNOPSIS</h2>
<p style="margin-bottom:0" class="asd_par">mcxquery is not in actual fact a program. This manual
page documents the behaviour and options of the mcx program when
invoked in mode <i>query</i>. The options <b>-h</b>, <b>--apropos</b>,
<b>--version</b>, <b>-set</b>, <b>--nop</b>, <b>-progress</b>&nbsp;<i>&lt;num&gt;</i>
are accessible
in all <b>mcx</b> modes. They are described
in the <a class="local sibling" href="mcx.html">mcx</a> manual page.</p>
<p style="margin-bottom:0" class="asd_par">
<b>mcxquery</b>
<a class="intern" href="#opt-abc"><b>[-abc</b> &lt;fname&gt; (<i>specify label input</i>)<b>]</b></a>
<a class="intern" href="#opt-imx"><b>[-imx</b> &lt;fname&gt; (<i>specify matrix input</i>)<b>]</b></a>
<a class="intern" href="#opt-o"><b>[-o</b> &lt;fname&gt; (<i>output file name</i>)<b>]</b></a>
<a class="intern" href="#opt-tab"><b>[-tab</b> &lt;fname&gt; (<i>use tab file</i>)<b>]</b></a>
<a class="intern" href="#opt--node-attr"><b>[--node-attr</b> (<i>output node degree and weight attributes</i>)<b>]</b></a>
<a class="intern" href="#opt-vary-threshold"><b>[-vary-threshold</b> &lt;start/end/step&gt; (<i>analyze graph at similarity cutoffs</i>)<b>]</b></a>
<a class="intern" href="#opt-vary-knn"><b>[-vary-knn</b> &lt;start/end/step&gt; (<i>analyze graph for varying k-NN</i>)<b>]</b></a>
<a class="intern" href="#opt-vary-ceil"><b>[-vary-ceil</b> &lt;start/end/step&gt; (<i>analyze graph for varying ceil reductions</i>)<b>]</b></a>
<a class="intern" href="#opt--no-legend"><b>[--no-legend</b> (<i>do not output explanatory legend</i>)<b>]</b></a>
<a class="intern" href="#opt--reduce"><b>[--reduce</b> (<i>use reduced matrix</i>)<b>]</b></a>
<a class="intern" href="#opt--test-metric"><b>[--test-metric</b> (<i>test whether graph distance is metric</i>)<b>]</b></a>
<a class="intern" href="#opt--test-cycle"><b>[--test-cycle</b> (<i>test whether graph contains cycles</i>)<b>]</b></a>
<a class="intern" href="#opt-test-cycle"><b>[-test-cycle</b> &lt;num&gt; (<i>test cycles, report cycles</i>)<b>]</b></a>
<a class="intern" href="#opt--vary-correlation"><b>[--vary-correlation</b> (<i>analyze graph at correlation cutoffs</i>)<b>]</b></a>
<a class="intern" href="#opt--clcf"><b>[--clcf</b> (<i>include clustering coefficient analysis</i>)<b>]</b></a>
<a class="intern" href="#opt--eff"><b>[--eff</b> (<i>include efficiency criterion</i>)<b>]</b></a>
<a class="intern" href="#opt-div"><b>[-div</b> &lt;num&gt; (<i>cluster size separating value</i>)<b>]</b></a>
<a class="intern" href="#opt--dim"><b>[--dim</b> (<i>report native format and dimensions</i>)<b>]</b></a>
<a class="intern" href="#opt--values"><b>[--values</b> (<i>output all arc entries/weights, unsorted</i>)<b>]</b></a>
<a class="intern" href="#opt--values-sorted"><b>[--values-sorted</b> (<i>output all entries/weights, sorted</i>)<b>]</b></a>
<a class="intern" href="#opt-values-hist"><b>[-values-hist</b> &lt;nbins|start/end/nbins&gt; (<i>weight histogram</i>)<b>]</b></a>
<a class="intern" href="#opt-degrees-hist"><b>[-degrees-hist</b> &lt;step&gt; (<i>degrees histogram</i>)<b>]</b></a>
<a class="intern" href="#opt--output-table"><b>[--output-table</b> (<i>output logical tab separated table without key</i>)<b>]</b></a>
<a class="intern" href="#opt-t"><b>[-t</b> &lt;num&gt; (<i>number of threads to use</i>)<b>]</b></a>
<a class="intern" href="#opt-icl"><b>[-icl</b> &lt;fname&gt; (<i>input clustering</i>)<b>]</b></a>
<a class="intern" href="#opt-tf"><b>[-tf</b> spec (<i>apply tf-spec to input matrix</i>)<b>]</b></a>
<a class="intern" href="#opt-h"><b>[-h</b> (<i>print synopsis, exit</i>)<b>]</b></a>
<a class="intern" href="#opt--apropos"><b>[--apropos</b> (<i>print synopsis, exit</i>)<b>]</b></a>
<a class="intern" href="#opt--version"><b>[--version</b> (<i>print version, exit</i>)<b>]</b></a>
</p>

<a name="description"></a>
<h2>DESCRIPTION</h2>
<p style="margin-bottom:0" class="asd_par">
The default <b>mcxquery</b> output is a list of summary statistics for each
node. These are its node degree, the mean, minimum, maximum and median
edge weight. If supplied with a clustering, the output will additionally
list the cluster size and cluster label for each node.
</p>
<p style="margin-bottom:0" class="asd_par">
Additionally, <b>mcxquery</b> can be used to analyse a graph at different similarity
cutoffs or at varying parameters of edge reduction strategies such as mutual
nearest neighbour reduction.
Attributes supplied across different thresholds are the number of connected
components, the number of singletons, and statistics (median, average, iqr)
on node degrees and edge weights.
Typically this is done on a graph constructed using a very permissive
threshold. For example, one can create a graph from array expression data
using <b>mcxarray</b> with a very low pearson correlation cutoff such as&nbsp;0.5
Then <b>mcxquery</b> can be used to analyze the graph at increasingly
stringent thresholds of&nbsp;0.50, 0.55, 0.60&nbsp;..&nbsp;0.95.
</p>
<p style="margin-bottom:0" class="asd_par">Other tasks that <b>mcxquery</b> be used for include:
</p>
<div class=" itemize " style="margin-top:1em; font-size:100%">
<div class=" item_compact"><div class=" item_leftalign " ><span class="itembullet">&bull;</span></div></div>
<div class=" item_text " style="margin-left:2em">
Produce a histogram of edge weights.
</div>
<div class=" item_compact"><div class=" item_leftalign " ><span class="itembullet">&bull;</span></div></div>
<div class=" item_text " style="margin-left:2em">
Produce a histogram of edge node degrees.
</div>
<div class=" item_compact"><div class=" item_leftalign " ><span class="itembullet">&bull;</span></div></div>
<div class=" item_text " style="margin-left:2em">
Output all edge weights.
</div>
<div class=" item_compact"><div class=" item_leftalign " ><span class="itembullet">&bull;</span></div></div>
<div class=" item_text " style="margin-left:2em">
Test whether the graph weight encodes a metric
(for edge weights that encode distances rather than similarites).
</div>
<div class=" item_compact"><div class=" item_leftalign " ><span class="itembullet">&bull;</span></div></div>
<div class=" item_text " style="margin-left:2em">
Test whether the graph has a cycle.
</div>
</div>

<a name="options"></a>
<h2>OPTIONS</h2>
<div class=" itemize " style="margin-top:1em; font-size:100%">
<div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-abc"></a><b>-abc</b> &lt;fname&gt; (<i>label input</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
The file name for input that is in label format.</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-imx"></a><b>-imx</b> &lt;fname&gt; (<i>input matrix</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
The file name for input that is in mcl native matrix format.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-o"></a><b>-o</b> &lt;fname&gt; (<i>output file name</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
Set the name of the file where output should be written to.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-tab"></a><b>-tab</b> &lt;fname&gt; (<i>use tab file</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This option causes the output to be printed with the labels
found in the tab file.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt--dim"></a><b>--dim</b> (<i>report native format and dimensions</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This will report the matrix format (either interchange or binary)
and the matrix dimensions. For a graph the two reported dimensions
should be equal.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--values"></a><b>--values</b> (<i>output all entries/weights, unsorted</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--values-sorted"></a><b>--values-sorted</b> (<i>output all entries/weights, sorted</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-values-hist"></a><b>-values-hist</b> &lt;start/end/nbins&gt; (<i>output weight histogram</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-values-hist"></a><b>-values-hist</b> &lt;nbins&gt; (<i>output weight histogram</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-degrees-hist"></a><b>-degrees-hist</b> &lt;nbins&gt; (<i>degrees histogram</i>)</div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
These options are fairly self-documenting. The result of both
<b>-edges-hist</b> and <b>-degrees-hist</b>
is a tab separated table of bin offsets and bin counts.
When using <b>-edges-hist</b>&nbsp;<i>&lt;nbins&gt;</i> the program will
create a histogram ranging from the smallest to
the largest edge weight.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt--output-table"></a><b>--output-table</b> (<i>output logical tab separated table without key</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This option causes table output such as provided by <b>--vary-correlation</b>
to be output in a logical tab-separated format rather than pretty-printed.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-vary-threshold"></a><b>-vary-threshold</b> &lt;start/end/nbins&gt; (<i>analyze graphs at similarity cutoffs</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
The graph is analysed at different edge weight thresholds, going from <b>&lt;start&gt;</b>
to <b>&lt;end&gt;</b> in <b>&lt;nbins&gt;</b> steps.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt--vary-correlation"></a><b>--vary-correlation</b> (<i>analyze graphs at correlation cutoffs</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This instructs <b>mcxquery</b> to use a threshold list suitable for use with graphs
in which the edge weight similarities are correlations.
The list starts at 0.2 and ends at 1.0 using increments of 0.05.
If a different start or increment is required it can
be achieved by using the <b>-vary-threshold</b> option.
For example, a start of&nbsp;0.10 and an increment of&nbsp;0.02 are obtained
by issuing <b>-vary-threshold</b>&nbsp;<b>:.1/1.0/45</b>.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " >defopt{--no-legend}{do not output explanatory legend}</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
For a fully parseable output format use <a class="intern" href="#opt--output-table"><b>--output-table</b></a>.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--clcf"></a><b>--clcf</b> (<i>include clustering coefficient analysis</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--eff"></a><b>--eff</b> (<i>include efficiency criterion</i>)</div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
These options can be used to compute additional characteristics
in the analysis of thresholded graphs with <b>--vary-correlation</b>
and <b>-vary-threshold</b>. For large graphs these are relatively time-consuming
to compute. More information and a reference for
the efficiency criterion can be found in <a class="local sibling" href="clminfo.html">clminfo</a>.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-vary-knn"></a><b>-vary-knn</b> &lt;start/end/step&gt; (<i>analyze graphs for varying k-NN</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-vary-ceil"></a><b>-vary-ceil</b> &lt;start/end/step&gt; (<i>analyze graphs for varying ceil reductions</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--reduce"></a><b>--reduce</b> (<i>use reduced matrix</i>)</div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
These options cause analysis of a graph as it is subjected to reductions
across a range of parameters. Refer to <a class="local sibling" href="mcxio.html">mcxio</a> for a description of
these reductions. The analyses starts at the <i>end</i> argument, and
progresses towards the <i>start</i> argument using decrements of size
<i>step</i>. By default the reduction is always computed relative to the
start matrix, i.e. the input matrix after <b>-tf</b> transformations have
optionally been applied. Specifying <b>--reduce</b> causes this to change
so that each new reduction is calculated relative to the reduction just
computed.
</p>
<p style="margin-bottom:0" class="asd_par">
For graphs with ties among edge weights it may be useful to use
<b>-tf</b>&nbsp;<b>'#tug()'</b>. This will add small perturbations to the
edge weights and have the effect of breaking ties.
By default perturbations are computed using the cosine between
the vectors of neighbours of the two nodes incident to an edge.
This can be changed to a random perturbation with
<b>-tf</b>&nbsp;<b>'#rug()'</b>.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt--test-cycle"></a><b>--test-cycle</b> (<i>test whether graph contains cycles</i>)</div><div class=" item_cascade item_leftalign nowrap" ><a name="opt-test-cycle"></a><b>-test-cycle</b> &lt;num&gt; (<i>test cycles, report cyclees</i>)</div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
Test whether the input graph contains cycles. With the second option
nodes that are part of a cycle are output, up to a maximum of <i>&lt;num&gt;</i>
nodes. Use <i>&lt;num&gt;</i>=<b>-1</b> to output all such nodes.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt--test-metric"></a><b>--test-metric</b> (<i>test whether graph distance is metric</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This tests all possible triangle relationships.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-div"></a><b>-div</b> &lt;num&gt; (<i>cluster size separating value</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
When analyzing graphs at different thresholds with one of the
options above, <b>mcxquery</b> reports the percentage of nodes contained
in clusters not exceeding a specified size, by default&nbsp;3.
This number can be changed using the <b>-div</b> option.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-tf"></a><b>-tf</b> &lt;tf-spec&gt; (<i>transform input matrix values</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
Transform the input matrix values according
to the syntax described in <a class="local sibling" href="mcxio.html">mcxio</a>.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-t"></a><b>-t</b> &lt;num&gt; (<i>number of threads to use</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
This has an effect only when using the <b>-vary-knn</b> option,
and is only useful on multi-CPU machines.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt--node-attr"></a><b>--node-attr</b> (<i>output node degree and weight attributes</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
Output is in the form of a tab separated file.
The option <b>-icl</b> can be used in conjuction.
</p>
</div>
<div style="margin-top:0em">&nbsp;</div><div class=" item_cascade"><div class=" item_leftalign nowrap " ><a name="opt-icl"></a><b>-icl</b> &lt;fname&gt; (<i>input clustering</i>)</div></div>
<div class=" item_text " style="margin-left:2em">
<p style="margin-top:0em; margin-bottom:0em">
Output for each node the size of the cluster it is in.
This option can be used in conjunction with <b>--node-attr</b>.
</p>
</div>
</div>

<a name="seealso"></a>
<h2>SEE ALSO</h2>
<p style="margin-bottom:0" class="asd_par">
<a class="local sibling" href="mcxio.html">mcxio</a>,
and <a class="local sibling" href="mclfamily.html">mclfamily</a> for an overview of all the documentation
and the utilities in the mcl family.</p>
</body>
</html>