I make it according to this formula, but there is something wrong with my formula

Grasshopper
1

I make it according to this formula, but there is something wrong with my formula. May I ask what is wrong with my formulｓｆｄｇｈ.gh (9.9 KB) a?

ripples
ripples1355×737 241 KB

2

Canvas%20at%2004%3B04%3B22
Canvas at 04;04;22.png1449×440 182 KB

ｓｆｄｇｈ_re.gh (9.2 KB)

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