[R] zero fill empty cell in data.frame

[Rolf Turner]

On 19/04/11 21:39, Simone Gabbriellini wrote:
> Hello List,
>
> I have a data frame like:
>
> 	V130	V131	V132	V133	V134	V135	V136
> 1	0		0 		0.9		0		0.9		0		0
> 2	0		0		0              		0		0		0.8
> 3	0		0		0              0		0.9		0		0
> 4	0.9		0		0              0		0		0		0.9
> 5	0		0		                0						
> 6	0		0		0		0.9		0		0		0.9
> 7	0		0 		0.8		0              0		0		0
> 8	0.9		0		                0		0.9		0.8		0
> 9	0		0		0		0.9		0.9		0		0
> 10	0		0		0		0		0		0		0.9
>
> I would like to fill the empty cells with a 0... how to address those empty cells?
>
> thanks for your help!

In general, filling empty cells with zeros is ***very bad practice***.  Zero
is not the same thing as ``missing''.   So basically:  Don't do this!  I 
don't care
how badly you want to do it, or who told you to do it, just ***don't***.

     cheers,

             Rolf Turner