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Syntax
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=PI()
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Prac tical PowerPivot & DAX Formulas for Excel 2010
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Analysis
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This might be useful if you have a column that records a radius and you also use it in conjunction with the POWER() function!
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POWER()
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The first parameter of POWER() is a number or a numeric column or an expression evaluating to a number The second parameter is the power to which to raise the number The example can be used in any table or as part of a measure
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Syntax
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=POWER(4,3)
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C h a p t e r 1 1 : M a t h & Tr i g Fu n c t i o n s
Result
Analysis
If you did have a radius of a circle column, then that column could be the first parameter The second parameter could be 2 and you might then multiply by PI(), to give you the area of a circle Of course, POWER() and PI() have rather more uses than that!
QUOTIENT()
QUOTIENT() divides the first numeric parameter by the second one and returns the integer part of the result The example uses the Products table
Syntax
=QUOTIENT(Products[ReorderLevel],2)
Prac tical PowerPivot & DAX Formulas for Excel 2010
Result
Analysis
You can achieve the same result by using this alternative syntax:
=INT(Products[ReorderLevel]/2)
RAND()
There are two functions for generating random numbers, RAND() and RANDBETWEEN() RAND() accepts no parameters and returns a random number between 0 and 1 The examples can be used in any table or as part of a measure
Syntax
=RAND() =RAND()*(10-1)+1
C h a p t e r 1 1 : M a t h & Tr i g Fu n c t i o n s
Result
Analysis
The result shown is from the second example It demonstrates how to generate a random number between 1 and 10 Your results will differ Also, the result is different for every row If you refresh the table, or force a manual recalculation, the results will change
RANDBETWEEN()
RANDBETWEEN() takes two parameters, a bottom boundary number and a top boundary number It returns random integers between those two numbers, inclusive The example can be used in any table or as part of a measure
Syntax
=RANDBETWEEN(1,10)
Prac tical PowerPivot & DAX Formulas for Excel 2010
Result
Analysis
If you recalculate your DAX functions, or refresh the source data, which forces recalculation, then both RAND() and RANDBETWEEN() as calculated columns will return different results In the example, RANDBETWEEN returns whole numbers Your results will differ This is different from the second example in the previous query:
=RAND()*(10-1)+1
ROUND()
Coming up are three more rounding functions for you to try ROUND() is the first one ROUND() will round up or round down It differs from MROUND() in that the second parameter is the number of significant figures rather than a unit or multiple of significance The example uses the Products table
Syntax
=ROUND(Products[UnitPrice],-1)
C h a p t e r 1 1 : M a t h & Tr i g Fu n c t i o n s
Result
Analysis
ROUND() can round down (like ROUNDDOWN()) or round up (like ROUNDUP()) The second parameter in this example is negative: -1 means round to an integer value If you wish to round to a number of decimal places, then make the second parameter positive Negative values for the second parameter round to the left of the decimal point It may be useful to compare the products Chang and Chef Anton s Cajun Seasoning The first is rounded up, and the second is rounded down
ROUNDDOWN()
ROUNDDOWN(), unlike ROUND(), always rounds down If the second argument is negative, it rounds down to the left of the decimal point The example uses the Products table
Syntax
=ROUNDDOWN(Products[UnitPrice],-1)
Prac tical PowerPivot & DAX Formulas for Excel 2010
Result
Analysis
It might be instructive to look at Chang and Chef Anton s Cajun Seasoning again
ROUNDUP()
As you probably expect, ROUNDUP() always rounds up A negative second parameter rounds up to the left of the decimal point The example uses the Products table
Syntax
=ROUNDUP(Products[UnitPrice],-1)
C h a p t e r 1 1 : M a t h & Tr i g Fu n c t i o n s
Result
Analysis
Once more, please take a look at both Chang and Chef Anton s Cajun Seasoning Hopefully, you can see the difference between ROUND(), ROUNDDOWN(), and ROUNDUP() If you would like to experiment further, you may like to try the following example, which has a positive second parameter, and look at Chef Anton s Gumbo Mix:
=ROUNDUP(Products[UnitPrice],1)
SIGN()
You might use SIGN() to help you identify positive and negative numbers in a pivot table The function returns a zero for zero values The example uses the Products table
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