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Mathematica

The Mathematica Book

A Practical Introduction to Mathematica

Lists

1.8.10 Grouping Together Elements of Lists

Functions for grouping together elements of lists.

Here is a list.

In[1]:= t = {a, b, c, d, e, f, g}

Out[1]=

This groups the elements of the list in pairs, and in this case throws away the single element which is left at the end.

In[2]:= Partition[t, 2]

Out[2]=

This groups elements in triples. There is no overlap between the triples.

In[3]:= Partition[t, 3]

Out[3]=

This makes triples of elements, with each successive triple offset by just one element.

In[4]:= Partition[t, 3, 1]

Out[4]=

This splits up the list into runs of identical elements.

In[5]:= Split[{a, a, b, b, b, a, a, a, b}]

Out[5]=