Spreadsheets Relative & Absolute Addresses CIL 102 ‘08 Fall.
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Transcript of Spreadsheets Relative & Absolute Addresses CIL 102 ‘08 Fall.
SpreadsheetsRelative & Absolute Addresses
CIL 102‘08 Fall
Relative & Absolute Addresses
• The concept of relative and absolute addresses becomes relevant when a spreadsheet user builds spreadsheets and copies formulas
• Copying formulas is frequently performed as a part of fundamental process
Simple Relative Address Example
Compute perimeter and area of rectangles
• Formulas– P = 2*(L+W)– A = L*W
• Use labels to set up your table
Simple Relative Address Example
Compute perimeter and area of rectangles
• Place perimeter formula in the first row
• Place area formula in the first row
Simple Relative Address Example
Compute perimeter and area of rectangles
• Highlight the two formulas and select Copy
• Copy them to the remaining slots in the two columns by highlighting the area and select Paste
Simple Relative Address ExampleCompute perimeter and area of rectangles• As you move the cursor
from formula to formula, not how the references to the length and width are adjusted, relative to the formula.
• The formulas in row 4 reference the length and width in row 4, the formulas in rows 5, reference the values in row 5, and so forth.
Simple Relative Address Example
• As long as the addresses associated to a formula change as the formula location changes, then relative addressing is fine
• RULE OF THUMBNormally, formula
references within a table are relative addressed as long as data and formulas are in rows or columns.
• Use a color highlight for each table to guide you.
Simple Absolute Address Example
• To illustrate absolute addressing, consider this variation of the perimeter/area table where the length is fixed.
• Perimeter and area change with length.
Simple Absolute Address Example
• Note that the length is outside of the table, it stays fixed.
• The width varies from row to row.
Simple Absolute Address Example
The F4 Key.• When you point to the
length, press the F4 key. Note the $ symbols – this indicates an absolute address
• The width is a relative address
Simple Absolute Address Example
The F4 Key.• When the formula is
duplicated down the column, the length reference says fixed (absolute), the width reference is relative
Simple Absolute Address Example
The F4 Key.• Complete the area
computation in the same manner
Simple Absolute Address Example
The F4 Key.• Complete the Area
computation with one absolute and one relative address.
• Copy the formula• Note the absolute and
relative references.
GPA Calculator
GPA Calculator
• List your courses• List your grades• List the number of credits
GPA Calculator
• Lookup the grade in the table and record the points• Compute the total points• Sum the points• Sum the credits• Compute the GPA
Look up the grade• Vertical look up table• The look up table is outside of the GPA table, hence
ABS address.• The grade being looked up is in the GPA table, hence
REL address
Vlookup
• Lookup_value: The grade (relative address)• Table_Array: The table (Absolute address)• Col_index_num: Number in column 2
Vlookup
• Col_index_num: Number in column 2• Table_Array: The table (Absolute address)• Lookup_value: The grade (relative address)
VLookup
Multiply points * credits
Copy formulas down columns
Auto Sum
• Credit column• Total points column
GPA
• Divide total points by total credits