This article describes the following:

A link is one of the two basic building blocks of all Logica models. Links transfer values between nodes. Hovering over any node in the canvas will display any link connection points on the left and right sides.

A link is capable of multiplication, division, addition, subtraction, rounding, averaging, accumulation (of multiple values), and more. When used efficiently, it can help minimize variable and operator usage.

A link is created by dragging and dropping from the link connection node on one variable or operator to that of another.

To view all links coming in and out for a given node, hover over or select the node with the mouse cursor. Incoming links are displayed in blue, and outgoing links are displayed in green. Links with default settings will display a solid line. Links with any non-default settings will display with a dotted line.

Click on a link to view the Link Settings in the right panel.

The link description provides insight to yourself and other users about the context and settings of the link.

The Get option sets whether the link passes the value or a transformed version of the values. See this section for more information about each option.

The From field displays the source node that is passing its value through the link.

The Scenario option allows you to set the value being passed through the link to a different source scenario.

The Time option sets either a static period value to be passed through the link or a number of relative periods included in the link transformation. See this section for more information about each option.

For specific link functions that can utilize relative time, there are two options:

The Skipping options allows for skipping a relative number of periods.

The Send option is used to adjust whether the values being passed through the link are set forward in time or backward in time.

The To field displays the destination node that is receiving its value through the link.

When this option is used, the source node values will be multiplied or divided by an input.

When this option is used, the input will be added to or subtracted from the source node values.

There are several ways links can be used to transform values from one node to another. This option is the Get field in the Right Side Panel.

When a link is set to get values, the output node receives the exact same values.

When a link is set to get moving average, the output node receives the moving average of the input node values. This option can be used with the relative period Time field option to calculate rolling averages, such a 12-month rolling average.

When a link is set to get cumulative, the output node receives the cumulative of the input node values. This option can be used with the relative period Time field option to calculate rolling cumulative, such a 12-month rolling cumulative.

When a link is set to get change, the output node receives the change in value over each time period of the input node values.

When a link is set to get relative change, the output node receives the relative change in value over each time period of the input node values.

When a link is set to get round, the output node receives the input node values rounded to the nearest integer.

When a link is set to get floor, the output node receives the input node values rounded down to the nearest integer.

When a link is set to get ceiling, the output node receives the input node values rounded up to the nearest integer.

When a link is set to get min, the output node receives minimum value of the input node on a rolling time basis.

When a link is set to get max, the output node receives maximum value of the input node on a rolling time basis.