Vectors, Matrices, and Tables > Working With Arrays > Example: Effect of ORIGIN on Lookup Functions
Example: Effect of ORIGIN on Lookup Functions
The system variable ORIGIN affects the result of lookup functions for which you must specify a row or column index. Only functions hlookup and vlookup meet this criteria.
The hlookup and vlookup functions can be evaluated both numerically and symbolically.
1. Define an input matrix.
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2. Evaluate ORIGIN to ensure that it is set to 0.
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ORIGIN=0
1. Define the row argument r and the z argument.
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2. Evaluate the horizontal lookup function hlookup.
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The returned element is located at the intersection of row r and the column that intersects row 0 at z1.
3. Define the column argument c.
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4. Evaluate the vertical lookup function vlookup.
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The returned element is located at the intersection of column c and the row that intersects column 0 at z1.
ORIGIN≠0
1. Set ORIGIN to 1.
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2. Reevaluate the horizontal lookup function hlookup.
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The returned element is located at the intersection of row r-ORIGIN and the column that intersects row 0 at z1.
3. Reevaluate the vertical lookup function vlookup.
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The returned element is located at the intersection of column c-ORIGIN and the row that intersects column 0 at z1.
4. Show that in order to get the same results when ORIGIN is set to 0, you must add the new value of ORIGIN to the r and c arguments.
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Lookup Functions
To Set the Array ORIGIN
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