Dear Jim,

Thank you very much for your suggestion! It worked perfectly! Thanks for
clarifying how things work.

Best regards,

Charles


On Wed, Sep 11, 2013 at 3:49 AM, Jim Lemon <jim@bitwrit.com.au> wrote:

> On 09/11/2013 09:06 AM, Charles Novaes de Santana wrote:
>
>> Dear all,
>>
>> I am following instructions of FAQ 7.2 (
>> http://cran.r-project.org/doc/**FAQ/R-FAQ.html#How-can-I-**
>> create-rotated-axis-labels_**003f<http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-create-rotated-axis-labels_003f>
>> )
>> to create rotated labels in my plots, but I am facing some problems when
>> plotting variables with small values (in my case, values between 0.001 and
>> 0.007).
>>
>> When I try to plot these small values, the X-label of my plot doesn't
>> appear. Please find below the example I am trying to run:
>>
>> #Definition of my variable and of the labels
>> a<-c(0.007,0.0004,0.0001)
>> laba<-c("number1","number2","**number3")
>>
>> #This plot doesn't work fine (label doesn't appear)
>> par(mar = c(7, 4, 4, 2) + 0.1)
>> plot(a,xaxt="n",xlab="",ylab="**Y-Label")
>> axis(1,labels=FALSE,tick=**FALSE)
>> mtext(1,text="X-Label",line=6)
>> text(1:length(a), par("usr")[3] - 0.25, srt = 45, adj = 1,labels = a, xpd
>> =
>> TRUE,cex=0.75)
>>
>> #If I just multiply my variable, the plot works fine (label appears)
>> par(mar = c(7, 4, 4, 2) + 0.1)
>> plot(1000*a,xaxt="n",xlab="",**ylab="Y-Label")
>> axis(1,labels=FALSE,tick=**FALSE)
>> mtext(1,text="X-Label",line=6)
>> text(1:length(a), par("usr")[3] - 0.25, srt = 45, adj = 1,labels = laba,
>> xpd = TRUE,cex=0.75)
>>
>> Do you have any idea about why is it happening? I much appreciate any
>> help!
>>
>>  Hi Charles,
> The problem lies in your specification of the y values for the labels in
> the "text" call. Because you are subtracting a large value relative to the
> range of y values, the labels are displayed way off the bottom of the plot.
> Try this instead:
>
> text(1:length(a),par("usr")[3]**-0.0002,srt=45,adj=1,
>  labels=a,xpd=TRUE,cex=0.75)
>
> If you want to pass explicit values for the positions on the plot, check
> them against the x and y ranges.
>
> Jim
>



-- 
Um axé! :)

--
Charles Novaes de Santana, PhD
http://www.imedea.uib-csic.es/~charles

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