[R] histograms and for loops

[David Winsemius]

On May 6, 2011, at 1:11 PM, wwreith wrote:

> The following code works mostly. It runs fine but...
>
> 1. Is there a way to increment the xlab for each graph? I would like  
> to have
> Graph 1, Graph 2, etc. Right now it just gives me Graph i over and  
> over
> again.
>

Use the power of bquote. See modified code below.

> 2. Is there a way to get the x-axis and y-axis to be bold or at  
> least a
> darker color? Right now it is light gray.

What do you mean by the "axis". The bounding box?, the ticks?, the  
labels?
>
> 3. Is there a way to modify this code to automatically save them? I  
> assume
> the answer is do it manually. This is not the most important.

?savePlot


>
> for(i in 1:12){
> hist(zNort1[,i], freq=FALSE, xlab=bquote("Graph "*.(i) ) ,
>           col="blue", main="Standardized
>           Residuals Histogram", ylim=c(0,1), xlim=c(-3.0,3.0))
> zNortmin<-min(zNort1[,1])
> zNortmax<-max(zNort1[,1])
> zNortmean<-mean(zNort1[,1])
> zNortsd<-sd(zNort1[,1])
> X1<-seq(-3.0, 3.0, by=.01)
> lines(X1, dnorm(X1, zNortmean, zNortsd) , col="black")
> }
>
>
> --


David Winsemius, MD
West Hartford, CT