[R] if condition and for cycles

[Rolf Turner]

Output from an R command is printed to the console ***only*** if the  
command
is issued *directly* from the command line.  Otherwise the output is  
invisible.
This includes unassigned output from commands issued ***inside  
functions***.
And, finally, functions include things like ``if'' and for loops.

If you want such output to be visibly displayed you must wrap it in  
an explicit
print statement.

In short you can solve your problems by wrapping your summary  
commands inside
print statements.  E.g. instead of

	summary(fitlinear)

write

	print(summary(fitlinear))


		cheers,

			Rolf Turner

On 28/11/2007, at 7:43 AM, ljantunes wrote:

>
> I have two questions about R:
>
> 1) Does anyone knows why I get the plots but not the summary  
> results of the
> linear fitting when I run this code? When I run it outside the if  
> condition
> it works fine.
>
> if (op==4) {
> 	t=1:length(time(SeaIce))
> 	fitlinear=lm(SeaIce~t)
> 	windows()
> 	plot.ts(SeaIce)
> 	lines(ts(fitlinear$fitted.values,start=1979,frequency=12))
> 	summary(fitlinear)
> 	fitlinear=ts(fitlinear$fitted.values,start=1979,frequency=12)
> 	c=cos(2*pi*t/12)
> 	s=sin(2*pi*t/12)
> 	fittotal=lm(SeaIce~t+c+s)
> 	summary(fittotal)
> 	windows()
> 	par(mfrow=c(2,1))
> 	plot(t,SeaIce)
> 	lines(fittotal$fit, col=2)
> 	plot(t,fittotal$resid)
> 	windows()
> 	acf(fittotal$resid)
> }
>
> 2) Why does't this work? I get the message "I'here" ten times but  
> the AIC
> results, none.
>
>
> for (i in 1:10) {
> 	f_arima = arima(SeaIce_STL_Remain,order=c(i,0,0))
> 	AIC(f_arima)
> 	Message("I´here")

	Surely this must be ``message("I'here")'' --- R is case sensitive!!!
	Attention to detail is vital.  Loose lips sink ships! :-)
> }
>
> Thanks in advance,
> Luis Antunes

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