You can use a dynamic range, define a name
=OFFSET(Sheet1!$A$1,0,0,COUNTA(Sheet1!$A:$A),COUNTA($1:$1))
will work for a table that starts in A1 in Sheet1, do insert>name>define
put a name like MyMatrix there and use a formula like
=VLOOKUP(A1,MyMatrix,2,0)
as an example, more info here
http://www.contextures.com/xlNames01.html#Dynamic

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Regards,
Peo Sjoblom
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> How do I change the range of data in a specific matrix, upon which other
> lookup formulas are referring to. I keep getting "value" and "ref"
> errors.