[Jprogramming] filling in missing values

[Dan Bron]

> Suppose I have some data, and some default values to 
> use in case there is no data:
> 	data =. a:,(1;2;3),a:,(3;2)
> 	fill =. 10 20 30 40 50 60 70
> The result I want is:
> 	10;1;2;3;50;3;2

I prefer the  mask}data,:fill  idiom:

	   (10;1;2;3;50;3;2) -: (data=a:)}data ,: <"0 fill 
	1
	   
	   (10;1;2;3;50;3;2) -: data (a:={.)`]}@:(,: <"0) fill
	1
	   
-Dan