The snapshot block takes a snapshot of a given expression when a discrete events is triggered.
In versions prior to Ecolego 6, this functionality was incorporated in the recorder block.
When creating a snapshot block, you must specify either the name of the object to monitor, or an expression to monitor. This is called the “Target expression”. You also select a discrete events which will trigger the snapshot.
From the Projects window
From the Matrix window
From the Blocks window
|Note||Most block properties can be edited directly in the Blocks window.|
The block editor is shown by right-clicking the block in a window and selecting Edit. In the Blocks window, you can also show the block editor by selecting the block and clicking the button, or by double-clicking the right-most “validation” column of the block.
The block editor has three tabs:
This page lets you edit basic properties such as name, sub-system and base unit. See editing properties for more information.
Dimension - You can specify the dimension of the block by using the Type drop down list. Depending on the dimension the index drop down lists are activated.
Data - The data table let you specify index specific properties like target expression.
Consider a model which simulates the financial transactions between yourself and your bank. A block named balance contains the current balance of your accounts. You wish to find out the maximum amount of money on your account over the month, and present this value by month.
To achieve this we need a discrete event which at the beginning of each month will
The reason that we use a snapshot is because the value of the Min/Max block will change over the month as money are deposited or withdrawn from your accounts.
Assuming that the time unit is years, create a discrete event named Event_new_month with the following values:
Create a min/max block named balance_max, with the operation of Maximum. Give it the following values:
Finally create a snapshot block with the following values: