>>>>> Duncan Murdoch <murdoch.dun...@gmail.com>
>>>>> on Wed, 23 Mar 2016 05:55:43 -0400 writes:
> On 23/03/2016 5:36 AM, catalin roibu wrote:
>> Dear R users,
>>
>> I have a dataframe with 6 columns and I want to create a plot (with for
>> loop). My question is how to add points in the for loop? I tried this
code,
>> but without success.
>>
>> vv<-rbind(colnames(ext))
>> for(i in 1:ncol(vv)){
>> with(ext, plot(rownames(ext), ext[,i], type="p",las=1,
>> bty="n",cex.main=2, cex.axis=1.5))
>> }
>>
>> Please help me to solve that!
> You can call the points() function to add points to an existing plot.
> The main difficulty is that the initial call to plot() establishes the
> axes and coordinate system; if later points fall outside the plot area,
> they won't be shown. So you may need to work out xlim and ylim in
advance.
Indeed! ... and that's why R has inherited the matplot() / matlines()
utility functions from S for about 20 years now. These do plot
all the columns of a numeric matrix and solve the xlim/ylim problem for you.
As the above R code is not reproducible (we do not have your 'ext'),
I have not tried if your use of "rownames"/"colnames" is easily
portable to matplot. If not (which I doubt), just take
matplot() as a template to writer your own function.
BTW: Your usage of with(.) seems entirely unnecessary ..
Martin Maechler
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