Add, Subtract, Multiply, Divide, Exponent and Remainder Nodes in Policy Designer

The Properties window for each node contains the items that are described in the following table.

Item	Description	Notes
First value	The first input value that will be used in the calculation.	You can select to specify the output of a predecessor node in this section.
Calculation symbol	The symbol that corresponds with the mathematical calculation that is performed by the node.	None
Second value	The second input value that will be used in the calculation.	You can select to specify the output of a predecessor node in this section.
Display list	Determines the label that appears on the node in the policy model.	This list does not appear if you enter a constant in the corresponding section.

The following example illustrates how you can use an Add node to add a constant value to a value that is defined by a predecessor node. Consider the following nodes and connection.

In this example, the Add node adds 1 to the value in the Alert Level field of a particular Health Indicator record. The following image shows what the Properties window looks like for the Add node.

Suppose that you want to add reading values to a Health Indicator, but you know that the accuracy of the reading values is +/-10%. You can mitigate misleading results by using a policy to round the reading values down before adding them to a Health Indicator.

Note: You can also round values using the Round node, but the Round node always rounds values to the nearest number. This example describes how you can consistently round down to a nearest number.

Consider the following nodes and connections. In this policy, the Remainder node is used in conjunction with a Subtract node to round the last reading value associated with a Measurement Location down to the nearest ten.

As shown in the following image of the Properties window for the Remainder node, you can use the Remainder node to calculate the amount remaining after the Last Reading value is divided by 10. For example, if the last reading value is 87, the result of the remainder node is 7 (87/10=8 with a remainder of 7).

Then, as shown in the following image of the Properties window for the Subtract node, you can then subtract the remainder from the reading value. The result of this calculation is the reading value rounded down to the nearest ten. Continuing with the previous example, the result of this node is 80 (87-7=80).

Finally, the result of the Subtract node (80) is added to a Health Indicator Value record which is linked to a Health Indicator.

The following table illustrates how the input values that you define for each node correspond to the mathematical calculations performed by the node. This table includes the mathematical calculation and output for each type of node when the first input value is 3 and the second input value is 2, as shown in this example of an Exponent node:

Node Type	Mathematical Calculation	Output Value
Add	3+2	5
Subtract	3-2	1
Multiply	3x2	6
Divide	3/2	1.5
Exponent	3^2	9
Remainder	3%2	1

The following tables summarize the possible combinations of time-based input values that you can use with Add, Subtract, Multiply, Divide, and Remainder nodes. First Value is the input value defined in the top section of the Properties window, and Second Value is the input value defined in the bottom section of the Properties window.

Add Node

First Value	Second Value	Output	Example
Timestamp	Time span	Timestamp	1/11/2000 + 10 Days = 1/21/2000
Time span	Timestamp	Timestamp	10 Days + 1/11/2000 = 1/21/2000
Time span	Time span	Time span	12 Days + 10 Days = 22 Days
Timestamp	Timestamp	Invalid	N/A

Subtract Node

First Value	Second Value	Output	Example
Timestamp	Time span	Timestamp	1/11/2000 - 10 Days = 1/1/2000
Time span	Timestamp	Invalid	N/A
Time span	Time span	Time span	12 Days - 10 Days = 2 Days
Timestamp	Timestamp	Time span	1/11/2000 - 1/1/2000 = 10 Days

Multiply Node

First Value	Second Value	Output	Example
Time span	Time span	Invalid	N/A
Time span	Number	Time span	10 Days x 5 = 50 Days
Number	Time span	Time span	5 x 10 Days = 50 Days

Divide Node

First Value	Second Value	Output	Example
Time span	Time span	Number	1 day / 8 hours = 3
Time span	Number	Time span	1 day / 2 = 12 hours
Number	Time span	Invalid	N/A

Remainder Node

First Value	Second Value	Output	Example
Time span	Time span	Time span	15 Days % 10 Days = 5 Days
Time span	Number	Invalid	N/A
Number	Time span	Invalid	N/A