[R] Odp: Histogram problem

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 20.08.2009 15:33:38:

> I'm trying to create a histogram from the following code, but my data 
keeps
> adding the Num vector and plotting that.  My data in the CSV file is 
just
> one vector.  Does anyone know why?

Well, I think that only you know why CSV file is just one vector, (which I 
do not believe as SPXdf[,2] does not coplain).

> 
> Thanks
> Conrad
> 
> 
> SPXdf = data.frame(read.csv(file = "SPX.csv", header = TRUE, sep = ",", 
dec
> = ".", fill = TRUE))


> SPXdf = data.frame(read.csv(file = "SPX.csv", header = TRUE, sep = ",", 
dec
+ = ".", fill = TRUE))
Error in file(file, "r") : cannot open the connection
In addition: Warning message:
In file(file, "r") : cannot open file 'SPX.csv': No such file or directory
> Max = max(SPXdf[,2])
Error: object 'SPXdf' not found
> Min = min(SPXdf[,2])
E

I can not retrieve the data, it throws an error.

> 
> Max = max(SPXdf[,2])
> Min = min(SPXdf[,2])
> Count = length(SPXdf[,2])
> sig = sd(SPXdf[,2])
> 
> BinSize = (3.5*sig)/(Count^(1/3))
> BinNum = (Max - Min)/(BinSize)
> Bins = seq(Min,Max,by = BinSize)
> Count2 = length(Bins)
> Num = mat.or.vec(1,Count2)
> 
> 
> for (i in 1:Count){
> 
>     for (j in 1:Count2){
> 
> 
>         if ((SPXdf[i,2] < Bins[j]))
>         {Num[j] = Num[j] + 1}
>     }
> 
> }
> 
> barplot(Num,Bins, xlab = "SPXdf", ylab = "Frequency")

R does what you require. You want barplot of Num vector with width 
according to Bin vector.

Just as a curiosity, does hist(SPXdf[,2]) show a histogram?

Regards
Petr


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