[R] How to figure the type of a variable?

[Duncan Murdoch]

On 06/09/2009 12:33 PM, Peng Yu wrote:
> Hi,
> 
> I want to know what is there returned values of 'lm'. 'class' and 'lm'
> does not show that the returned value has the variable coefficients,
> etc. I am wondering what is the command to show the detailed
> information. If possible, I aslo want the lower level information. For
> example, I want to show that 'coefficients' is a named list and it has
> 2 elements.

Try the str() function, it shows a summary of the structure of an object.

Duncan Murdoch


> 
> Regards,
> Peng
> 
>> x=1:10
>> y=1:10
>> r=lm(x~y)
>> class(r)
> [1] "lm"
>> mode(r)
> [1] "list"
>> r
> 
> Call:
> lm(formula = x ~ y)
> 
> Coefficients:
> (Intercept)            y
>   1.123e-15    1.000e+00
> 
>> r$coefficients[1]
>  (Intercept)
> 1.123467e-15
>> r$coefficients[[1]]
> [1] 1.123467e-15
>> r$coefficients[2]
> y
> 1
>> r$coefficients[[2]]
> [1] 1
> 
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