PadLeft
 Usage
• PadLeft[list, n] makes a list of length n by padding list with zeros on the left.
• PadLeft[list, n, x] pads by repeating the element x.
• PadLeft[list, n, { ,  , ... }] pads by cyclically repeating the elements  .
• PadLeft[list, n, padding, m] leaves a margin of m elements of padding on the right.
• PadLeft[list, { ,  , ... }] makes a nested list with length  at level i.
Notes
• PadLeft[list, n, ... ] always returns a list of length n, except in some special cases where padding is {}. • With padding { ,  , ... ,  } cyclic repetitions of the  are effectively laid down and then the list is superimposed on top of them, with the last element of the list lying on an occurrence of  . • PadLeft[list, n, padding, -m] truncates the last m elements of list. • A margin of Round[(n-Length[list])/2] effectively centers list. • PadLeft[list, n, list] effectively treats list as cyclic. • PadLeft[list, n, {xlist}] can be used to repeat an individual element that is itself a list. • PadLeft[{}, n, { ,  , ... }] repeats the sequence of  as many times as fits in a list of length n. • PadLeft[list, { ,  , ... }] creates a full array with dimensions { ,  , ... } even if list is ragged. • Negative  specify to pad on the right. • PadLeft[list, { ,  }, {{ ,  , ... }, { , ... }, ... }] pads by repeating the block of  . • PadLeft[list, { ,  , ... }, list] effectively treats list as cyclic in every dimension. • PadLeft[list, { ,  , ... }, padding, { ,  , ... }] uses margin  at level i. • The object list need not have head List. • New in Version 4. • Advanced Documentation.
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