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Autoconversion: Xpresso will try to convert types automaticaly if possible. One of the most used autoconversions is that from Vector to Real. It will give the length of the vector. Conversion of a real into a vector will give you a vector whos components all have the same value as the real.
Port names: You can display the names of XGroup ports by choosing Ports->Show Names from the context menu in the expresso editor.
Vector multiplication: Using the Math node set to Vector and Multiplication will multiply the components: (a/b/c)*(1/2/3)=(a*1/b*2/c*3)
If you use a real value on a vector due to autoconversion it looks like this: 5 * (a/b/c) = (a*5/b*5/c*5)
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