Skip to main content

# EXAMPLE - Comparison Functions2

This example demonstrates functions for comparing the relative values of two functions.

Functions:

Item

Description

LESSTHANEQUAL Function

Returns true if the first argument is less than or equal to the second argument. Equivalent to the <= operator.

LESSTHAN Function

Returns true if the first argument is less than but not equal to the second argument. Equivalent to the < operator.

GREATERTHANEQUAL Function

Returns true if the first argument is greater than or equal to the second argument. Equivalent to the >= operator.

GREATERTHAN Function

Returns true if the first argument is greater than but not equal to the second argument. Equivalent to the > operator.

In the town of Circleville, citizens are allowed to maintain a single crop circle in their backyard, as long as it confirms to the town regulations. Below is some data on the size of crop circles in town, with a separate entry for each home. Limits are displayed in the adjacent columns, with theinclusivecolumns indicating whether the minimum or maximum values are inclusive.

Suggerimento

As part of this exercise, you can see how to you can extend your recipe to perform some simple financial analysis of the data.

Source:

Location

Radius_ft

minRadius_ft

minInclusive

maxRadius_ft

maxInclusive

House1

55.5

10

Y

25

N

House2

12

10

Y

25

N

House3

14.25

10

Y

25

N

House4

3.5

10

Y

25

N

House5

27

10

Y

25

N

Transformation:

After the data is loaded into the Transformer page, you can begin comparing column values:

 Transformation Name New formula Single row formula LESSTHANEQUAL(Radius_ft,minRadius_ft) 'tooSmall'

While accurate, the above transform does not account for the minInclusive value, which may be changed as part of your steps. Instead, you can delete the previous transform and use the following, which factors in the other column:

 Transformation Name New formula Single row formula IF(minInclusive == 'Y',LESSTHANEQUAL(Radius_ft,minRadius_ft),LESSTHAN(Radius_ft,minRadius_ft)) 'tooSmall'

In this case, the IF function tests whether the minimum value is inclusive (values of 10 are allowed). If so, the LESSTHANEQUAL function is applied. Otherwise, the LESSTHAN function is applied. For the maximum limit, the following step applies:

 Transformation Name New formula Single row formula IF(maxInclusive == 'Y', GREATERTHANEQUAL(Radius_ft,maxRadius_ft),GREATERTHAN(Radius_ft,maxRadius_ft)) 'tooBig'

Now, you can do some analysis of this data. First, you can insert a column containing the amount of the fine per foot above the maximum or below the minimum. Before the first derive command, insert the following, which is the fine ($15.00) for each foot above or below the limits:  Transformation Name New formula Single row formula 15 'fineDollarsPerFt' At the end of the recipe, add the following new line, which calculates the fine for crop circles that are too small:  Transformation Name New formula Single row formula IF(tooSmall == 'true', (minRadius_ft - Radius_ft) * fineDollarsPerFt, 0.0) 'fine_Dollars' The above captures the too-small violations. To also capture the too-big violations, change the above to the following:  Transformation Name New formula Single row formula IF(tooSmall == 'true', (minRadius_ft - Radius_ft) * fineDollarsPerFt, if(tooBig == 'true', (Radius_ft - maxRadius_ft) * fineDollarsPerFt, '0.0')) 'fine_Dollars' In place of the original "false" expression (0.0), the above adds the test for the too-big values, so that all fines are included in a single column. You can reformat the fine_Dollars column to be in dollar format:  Transformation Name Edit column with formula fine_Dollars NUMFORMAT(fine_Dollars, '$###.00')

Results:

After you delete the columns used in the calculation and move the remaining ones, you should end up with a dataset similar to the following:

Location

fineDollarsPerFt

Radius_ft

minRadius_ft

minInclusive

maxRadius_ft

maxInclusive

fineDollars

House1

15

55.5

10

Y

25

N

$457.50 House2 15 12 10 Y 25 N$0.00

House3

15

14.25

10

Y

25

N

$0.00 House4 15 3.5 10 Y 25 N$97.50

House5

15

27

10

Y

25

N

\$30.00

Now that you have created all of the computations for generating these values, you can change values forminRadius_ft,maxRadius_ft, andfineDollarsPerFtto analyze the resulting fine revenue. Before or after the transform where you set the value for fineDollarsPerFt, you can insert something like the following:

 Transformation Name Edit column with formula minRadius_ft '12.5'

After the step is added, select the last line in the recipe. Then, you can see how the values in the fineDollars column have been updated.