<h1><span style="font-family:courier new,courier,monospace">Convert a molten data table into an data table (array type)</span></h1>
<h3 style="color:#aaa; font-style:italic"><span style="font-family:courier new,courier,monospace">Input(head)</span></h3>
<div style="background:#eee;border:1px solid #ccc;padding:5px 10px;"><span style="font-family:courier new,courier,monospace"><span style="font-size:11px"> Species ID Var1 Var2 Val Group Print_name<br />
<h1><span style="font-family:courier new,courier,monospace">Data table aggregation with 'by'</span></h1>
<h3 style="color:#aaa;font-style:italic;"><span style="font-family:courier new,courier,monospace">Input(head)</span></h3>
<div style="background:#eee;border:1px solid #ccc;padding:5px 10px;"><span style="font-family:courier new,courier,monospace"><span style="font-size:11px"> ID CDS_length FPKM ord bin<br />
5: g10012.t1.cds@g10012@000073F 10.762382 0.5596289 785 1</span></span></div>
<h3 style="color:#aaa;font-style:italic;"><span style="font-family:courier new,courier,monospace">Code</span></h3>
<div style="background:#eee;border:1px solid #ccc;padding:5px 10px;"><span style="font-family:courier new,courier,monospace"><big>dt[, .(Mean_CDS_length = mean(CDS_length), Mean_FPKM = mean(FPKM)), by=bin]</big></span></div>
<h3 style="color:#aaa;font-style:italic;"><span style="font-family:courier new,courier,monospace">Output</span></h3>
<div style="background:#eee;border:1px solid #ccc;padding:5px 10px;"><span style="font-family:courier new,courier,monospace"><span style="font-size:11px"> bin Mean_CDS_length Mean_FPKM<br />