A variable is a real numerical value lying between a mini and a maxi value ad defined with an step value.
The value returned in a calculus is named current value.
A variable is created through icon .
A variable can modified through icon .
In the dialog box opened when creating a variable you can associate to the variable a special display in the lower right side of the figure as follows :
When clicking on the + button, the variable will be incremented by the step value.
When clicking on the - button, the variable will be decremented by the step value.
Clicking on the = button opens a dialog box allowing the user to modify the variable.
A variable ca be used to generate a linked point locus, a dotted point locus or an object locus.
A variable can also been used to create a macro :