Thread
 Usage
• Thread[f[args]] "threads" f over any lists that appear in args.
• Thread[f[args], h] threads f over any objects with head h that appear in args.
• Thread[f[args], h, n] threads f over objects with head h that appear in the first n args.
• Thread[f[args], h, -n] threads over the last n args.
• Thread[f[args], h, {m, n}] threads over arguments m through n.
Notes
• Functions with attribute Listable are automatically threaded over lists. • All the elements in the specified args whose heads are h must be of the same length. • Arguments that do not have head h are copied as many times as there are elements in the arguments that do have head h. • Thread uses the standard sequence specification (see Section A.3.5). • New in Version 1.
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