Hi,

I have found a scaling tutorial on designalyze.com by Zach Downey and I got lost near the row :

`scaleVect = [x - sc for x in scaleVect].`

What is going on here exactly? I do not understand that “x” as variable has been introduced but how the script knows that “x” refers to the 1st member of the scaleVect list ?

```
import rhinoscriptsyntax as rs
def RecursiveScale(objID,scalePt,scaleFact, scaleVect, num):
if num == 0:
return 0
else:
sc = (1.0 / scaleFact)
scaleVect = [x - sc for x in scaleVect]
rs.ScaleObject(objID, scalePt, scaleVect, True)
return RecursiveScale(objID, scalePt, scaleFact, scaleVect, num-1)
objID = rs.GetObject()
scalePt = rs.GetPoint("Pick Scale Center")
scaleFact = rs.GetReal("Enter a scale Factor", 10, 0)
scaleVect = [1.0, 1.0, 1.0]
num = rs.GetInteger("Enter a the number of iterations", 10, 1)
RecursiveScale(objID, scalePt, scaleFact, scaleVect, num)
indent preformatted text by 4 spaces
```