Histogram problem

for (i in 1:Count){

    for (j in 1:Count2){


        if ((SPXdf[i,2] < Bins[j]))
        {Num[j] = Num[j] + 1}
    }

}

Petr

Actually I wanted to find why the NUm vector was adding incrementally, 

about the CSV.

Thanks

On Thu, Aug 20, 2009 at 3:24 PM, Petr PIKAL <petr.pikal at precheza.cz> 

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 

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 

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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