Supposing you have the following as your structure and your table
structureName.coordinates={1,2,3}
structureName.type='type'
tableName=table(structureName)
You can access the structure using the following code. Note that the '1' is a reference to the index of the table variable you are attempting to access. In this case the structure of interest is the first (and only) variable of the table. Otherwise you would replace '1' with 'n' where 'n' is the index of the structure within your table.
tableName{:,1}
To access the fields of the structure, you could use:
tableName{:,1}.type
tableName{:,1}.coordinates
Assuming you want to create your 1x3 matrix separate from your table, you could use
cell2mat(tableName{:,1}.coordinates)
For all instances used above you could replace
tableName{:,1}
with
tableName.structureName
and get equivalent results.