R help - Mar 2011 - (no subject)

Hi everyone, I have problems with a double for loop and the program response:
"Error in 1:mass[j] : NA/NaN argument"

I'm trying to create a very simple script to generate a vector full of
objects with the value [fuel] and in the amount [mass] for a hist plot.

H=1
for (j in 1:63)
                             {for (i in 1:mass[j])
                                                          {
H[length(H)+1]=fuel[j]}
                             }

What does the error mean?(where do I find explanations for such issues?

 Why does not a simple for loop work?

Error in 1:mass[j] : NA/NaN argument

Thank you very much for your time if you can help me!

/Andreas


	[[alternative HTML version deleted]]

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org]
> On Behalf Of Andreas Emanuelsson
> Sent: Monday, March 14, 2011 9:25 AM
> To: r-help at r-project.org
> Subject: [R] (no subject)
> 
> Hi everyone, I have problems with a double for loop and the program
> response: "Error in 1:mass[j] : NA/NaN argument"
> 
> I'm trying to create a very simple script to generate a vector full of
> objects with the value [fuel] and in the amount [mass] for a hist plot.
> 
> H=1
> for (j in 1:63)
>                              {for (i in 1:mass[j])
>                                                           {
> H[length(H)+1]=fuel[j]}
>                              }
> 
> What does the error mean?(where do I find explanations for such issues?
> 
>  Why does not a simple for loop work?
> 
> Error in 1:mass[j] : NA/NaN argument
> 
> Thank you very much for your time if you can help me!
> 
> /Andreas
> 
> 
You haven't provided a reproducible example, so we can't be sure exactly
what is going wrong.  However, I might hazard a guess that for some value of j,
mass[j] does not exist.  What is the length of the vector mass?  Are there any
NA in mass?

Dan

Daniel Nordlund
Bothell, WA USA

On Mar 14, 2011, at 12:25 PM, Andreas Emanuelsson wrote:
> Hi everyone, I have problems with a double for loop and the program  
> response: "Error in 1:mass[j] : NA/NaN argument"
>
> I'm trying to create a very simple script to generate a vector full  
> of objects with the value [fuel] and in the amount [mass] for a hist  
> plot.
>
> H=1
> for (j in 1:63)
>                             {for (i in 1:mass[j])
>                                                           
> { H[length(H)+1]=fuel[j]}
>                             }
>
> What does the error mean?(where do I find explanations for such  
> issues?
You seem to need to read up on basic R programming. That would appear  
to be an assignment task for which an indexed solution would be much  
more appropriate. It is really rather bizarre to walk along a vector  
(as you do for `mass`) without doing anything in the function body  
with the index.

H <- vector(64, "numeric")
H[2:64] <- fuel[1:63]

>
> Why does not a simple for loop work?
>
> Error in 1:mass[j] : NA/NaN argument
It appears that for some value between 1 and 63, a value for mass[j]  
is missing. Without a better description of the data (specifically  
`mass`), not much more can be said.

>
> Thank you very much for your time if you can help me!
>
> /Andreas
>
>
> 	[[alternative HTML version deleted]]
>
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