Insert digit grouping notation

[ssimop]

I have written the following function to insert a digit grouping comma to a double precision value converted to string:

Function tempf11

Code:

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double x=12345.68
str s=x
int i=find(s ".")

i=iif(i<0 len(s)-3 i-3)
if i > 0; s.insert("," i)

out s

I wonder whether there exists a system function to do it in an elegant way.

Many thanks in advance.