thanks, I'll try to put this in when I can. meanwhile dtmod wrote me saying that he's doing a real external for this, so that would be a better solution. anyway since I started, I'll try to finish my work.

 [expr pow(1-$f1,3)*pow($f1,0)*$f2 +
       pow(1-$f1,2)*pow($f1,1)*$f3 +
       pow(1-$f1,1)*pow($f1,2)*$f4 +
       pow(1-$f1,0)*pow($f1,3)*$f5]

doh, I forgot some multipliers.

  [expr 1*pow(1-$f1,3)*pow($f1,0)*$f2 +
        3*pow(1-$f1,2)*pow($f1,1)*$f3 +
        3*pow(1-$f1,1)*pow($f1,2)*$f4 +
        1*pow(1-$f1,0)*pow($f1,3)*$f5]

when you vary the order, the 1 3 3 1 sequence goes like this :

1
1  1
1  2  1
1  3  3  1
1  4  6  4  1
1  5 10 10  5  1
1  6 15 20 15  6  1

notice how the numbers for each order are made from the numbers for the
previous order : each number is the one above plus the one to the left of
the one above.

you also get that same pattern of numbers doing various things such as the theory of coin-flipping, approximations of Gaussian blur, or if you expand
pow(x+1,n), e.g. :

   pow(x+1,4) is the same as :
     1*pow(x,0) +
     4*pow(x,1) +
     6*pow(x,2) +
     4*pow(x,3) +
     1*pow(x,4)

Note that http://en.wikipedia.org/wiki/Pascal_triangle has some cool
drawings and animations about it. (I especially like the fact that a
fractal appears in that number pattern if you make many rows of it)

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