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accessing a element of a 3f vector in vex

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In a vex attributewrangle node I'm trying to access all elements of the @pprevious attribute. The @pprevious seams to work differently than @P and @Cd.  I cannot figure out what the syntax should be. Could someone help me with that?


@Cd = @pprevious; This doesn't give an error but it copies the 1st element of the @pprevious to all elements of @Cd. 


These all give errors:

@Cd.x = @pprevious.x;
@Cd.x = @pprevious[0];
@Cd.x = @pprevious.0;

@Cd.x = @pprevious(0);


Im using Houdini 14.0.474.

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