Function Repository Resource:

EveryOther

Split a list into two sublists, gathering every other element of the list

Contributed by: Wolfram Staff

ResourceFunction["EveryOther"][{e₁,e₂,e₃,e₄,…}]

returns {{e₁,e₃,…},{e₂,e₄,…}}.

ResourceFunction["EveryOther"][{e₁,e₂,…},n]

returns n sublists {{e₁,e_1+n,…},…{e_n,e_2n,…}}.

Details and Options

For a list of even length, ResourceFunction["EveryOther"][list] is equivalent to Transpose[Partition[list,2]].

If n evenly divides the list length, ResourceFunction["EveryOther"][list,n] is equivalent to Transpose[Partition[list,n]].

Split the List, combining elements in odd and even positions:

In[1]:=

Out[1]=

Group elements separated by gaps of length n:

In[2]:=

Out[2]=

Transpose[Partition[list,2]] gives the same result as EveryOther[list], as long as list has an even number of elements:

In[3]:=

Out[3]=

In[4]:=

Out[4]=

In[5]:=

Out[5]=

Transpose[Partition[list,n]] gives the same result as EveryOther[list,n], as long n evenly divides Length[list]:

In[6]:=

Out[6]=

In[7]:=

Out[7]=

In[8]:=

Out[8]=