Variables

How do I?

• Add a variable?
• Delete a variable?
• Change a variable's name?
• Change a variable's min/max value?
• Move a variable?
• Copy a variable?
• Turn on/off the grid lines?
• Turn on/off the 'x' values for a selected set?

See also the set and Rules "how to" pages and the tutorial.

Adding A Variable

To add a variable select "Variable | Insert Variable" or click on it's toolbar icon:

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Deleting A Variable

To delete a variable, select the variable you want to remove and select "Variable | Delete Variable". 

Note: deleting a variable will clear any rules for the model

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Changing A Variable's Name

To change a variable's name, click on it's label in the tree view and type in the new name.  Variable names must be unique within the Spark! model.

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Changing A Variable's Min/Max Value

To change a variable's min/max values, click on the label in the tree view.  This will allow you to edit the value.  The only restriction on the values is that the min and max cannot be the same.

Note: While only two decimal places are displayed, the values are stored as floats so you get more than two decimal places of precision.

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Moving A Variable

Variables can be re-ordered in the tree view by dragging and dropping them within the tree view.

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Copying A Variable

Variables can be copied by holding down the SHIFT key when dragging and dropping.  This will produce an exact replica of the variable, renamed so the new variable has a unique name.

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Turning On/Off The Grid Lines

You can turn on and off the grid line display by selecting "View | Grid Lines" or clicking on it's toolbar icon:

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Turning On/Off The 'x' Values For A Selected Set 

You can turn on and off the 'x' value display by selecting "View | Set 'x' Values" or clicking on it's toolbar icon:

These 'x' values allow you to place the set's nodes more precisely.

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