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# More Spreadsheets - PowerPoint PPT Presentation

More Spreadsheets. Range Formulas &amp; Empty Cells Logical Functions Lookup Functions. Range Arguments. Can all math functions be used with a range argument? NO! May get error or may get one value, depending on where the formula is entered relative to the range.

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Presentation Transcript

Range Formulas & Empty Cells

Logical Functions

Lookup Functions

Range Arguments
• Can all math functions be used with a range argument?
• NO! May get error or may get one value, depending on where the formula is entered relative to the range.
• Correct—Enter formula in terms of first cell in range, then copy/paste to “iterate”
• (see emptys.xls in examples/solutions)
Ranges that include different types of cells
• How do mathematical functions such as sum, max, average, count treat cells that are empty or have text?
• What do the functions averageA, countA, maxA do instead?
Logical Combinations
• And(logical1,logical2,…) produces TRUE when all are true, otherwise FALSE
• OR(logical1,logical2,…) produces FALSE when all are false, otherwise TRUE (“inclusive or”)
• NOT(logical1) produces TRUE when logical1 is false, and produces FALSE when logical2 is true
The IF Function
• IF(logical expression, value_when_true, value_when_false)
• =If(B3>5,C2^2,”Carl”) put in cell D2 would cause D2 to display 64
• Copy & paste to cell D1 would cause D1 to display ?
Information Functions
• ISBLANK(cell) is TRUE when cell is empty
• ISTEXT(cell) is TRUE when cell has text
• Note the difference between ISTEXT(“1”) and ISTEXT(1)
• ISNA(value) is TRUE when value is the #N/A error value
COUNTIF
• COUNTIF(range, condition to be counted)
• =Countif(a3:a12,5) returns the number of times 5 appears in the range
• =countif(a3:a12,”Bob”) returns the number of times Bob appears in the range
• =countif(a3:a12,D3) returns the number of times the value in D3 appears in the range
• =countif(a3:a12,”>5”) returns the number of times a value greater than 5 appears in the range
COUNTIF
• =countif(a3:a12,”=5”) returns the number of times 5 appears in the range
• =countif(a3:a12,”=D3”) does NOT return the number of times the value in D3 appears in the range
• =countif(a3:a12,”>D3”) does NOT return the number of times a value greater than the value in D3 appears in the range
• =countif(a3:a12,”>”&D3) retuns the number of times a value greater than the value in D3 appears in the range
SUMIF
• SUMIF(range,criteria,sum_range)
• Range is the cells to examine for meeting the criteria
• Criteria is the condition to be met
• Sum_range is the corresponding cells to add when criteria is met
• =sumif(a2:a5,”>0”,b2:b5) adds those cells in b2 thru b5 whose corresponding a2 thru a5 value is positive
SUMIF
• The same limitations as countif apply with regard to the criteria including relational operators and cell references
• =sumif(a2:a5,”>c3”,b2:b5) does NOT correctly add those cells in b2 thru b5 whose corresponding a2 thru a5 value is greater than the value in cell c3
• (see countif.xls in examples)
Table Lookups & References
• Vlookup & HLookup—used to look for a “target” in first column or row of a table & return a “corresponding” value from another column or row of the table
• Lookup—used to look for a “target” in a “vector” (single row or column) & return a value in the corresponding position in another “vector” (single row or column)
• Match—used to find the relative position of a “target” in a vector
• Index—used to return the value in a specified relative position in a table
VLookup & Hlookup Specifics
• First argument is target (what you are looking for)
• Second argument is range in which you are looking (limited to leftmost column of range for vlookup, topmost row of range for hlookup)
• Third argument is relative column(for vlookup) or row (for hlookup) from which corresponding value is to be returned. Must have been included in range.
• Fourth argument is TRUE or FALSE, used as a “flag” & is optional—but if omitted assumes TRUE
• FALSE—does not assume column/row being searched is already sorted, requires an exact match
• TRUE—requires column/row being searched is already sorted in ascending order, & that you will accept the largest value <= target
VLookup Example

What formula can we enter in E15 so that when we enter a name in D15, E15 will display that contestant’s score from the Canadian judge?

VLookup Example

=vlookup(d15,a8:h11,5,false)

If we enter “Yvonne” in d15, E15 displays 5

=vlookup(d15,a8:h11,5)

If we enter “Sonia” in d15, E15 displays 8.8—which is wrong! Why?

Match(target,vector,flag)
• Searches row or column for “target”, returning its relative position in the row or column
• Flag can be
• 1 which means vector is sorted in ascending order, in which case returns largest value <= target
• 0 which means exact match required, vector need not be sorted
• -1 which means vector is sorted in descending order, in which case returns smallest value >=target
Match Example

What formula can we enter in E17 so that it will display the relative row corresponding to the winner of the contest?

=match(max(h8:h11),h8:h11,0)

Produces 4

Index(table,row,column)
• Used to extract a value from a table based on its relative row & column position
• Index(b3:d5,2,3) would display value in cell d4
• Index(b3:b5,2) would display value in cell b4
• Index(b3:d3,2) would display value in cell c3
• Can “nest” match inside index to locate a position & return a corresponding value
Index Example

What formula can we enter in E17 so that it will display the name of the winner of the contest?

=index(a8:a11, match( max(h8:h11) ,h8:h11,0) )

Produces Sonia