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Insert
Insert[
list
,
elem
,
n
] inserts elem at position n in list. If n is negative, the position is counted from the end.
Insert[
expr
,
elem
,
i
,
j
, ... 
] inserts elem at position 
i
,
j
, ...  in expr.
Insert[
expr
,
elem
,
,
, ... 
,
,
, ... 
, ... 
] inserts elem at several positions.
Examples: Insert[
a, b, c
, x, 2] .
Insert[
a, b, c
, x,
1
,
-1
].
Insert[
a, b
,
c, d
, x,
2, 1
].
list can have any head, not necessarily List.
See the Mathematica book: Section 1.8.6.
See also: Prepend, Append, StringInsert, Take, Drop, Delete, ReplacePart, FlattenAt, Position, Sequence.
Further Examples
This inserts d into the fourth position of this list.
In[1]:= 
Out[1]= 
This inserts b in the first and second positions of this list.
In[2]:= 
Out[2]= 
This function builds a random permutation of Range[n] by inserting one element at a time.
In[3]:= 
In[4]:= 
Out[4]= 
This function "sows" copies of the specified object between each pair of entries of expr.
In[5]:= 
In[6]:= 
Out[6]= 
This variant also places copies before the first and after the last elements.
In[7]:= 
In[8]:= 
Out[8]= 
In[9]:= 
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT. SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION. | | | |
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