Thankyou.

Excel seems limited to 6 orders of polynomial (or whatever) and the coding seems to break down if the text is longer than that. Maybe those who are in the know could get an equation that would work on longer strings, all 24 chars in JAPH, then you may have one equation called 24 times.

while(++$1<25){print chr "<equation>"}
[download]

A weakness may be in how computer handles numbers with rounding etc.