R help - Feb 2007 - printing intermediate lines while in a function

Hi,

I'm trying to make a function which does a lot of computational work and
visualization work.
This won't be a problem, but as things can get a lot of computational time,
I would like to print what is going on, but also instructions about what the
user should do.

A small example:

fctn <- function(data.df){
    cat("Calculating linear regression \n")
    data.lm <- lm(y~x,data.df)
    cat("Calculating ANOVA \n")
    data.aov<- aov(data.lm)
    cat("Plotting graphs \n")
    plot(y~x, data.df)
    cat("Click on the graph to set X and Y limits \n")}
    lim <- locator(n=2)
    plot(y~x,data.df,ylim=sort(lim$y),xlim=sort(lim$x))
    ...............
}

But unfortunately R will do first the calculations and then afterwards return
the strings.

Is there a way around?


Thanks

Bart

	[[alternative HTML version deleted]]

You're using Windoze, aren't you?  You didn't say.

See the Windoze-specific FAQ, 7.1.

                                cheers,

                                        Rolf Turner
                                        rolf at math.unb.ca

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message:
> <snip>
>
> But unfortunately R will do first the calculations and then
> afterwards return the strings.
> 
> Is there a way around?

Thanks for al the tips, it was the readline() function who did the trick for 
me, so thanks for all of your input

Kind Regards

Bart


 Original message:
>
>> <snip>
>>
>> But unfortunately R will do first the calculations and then
>> afterwards return the strings.
>>
>> Is there a way around?
>