I'm a new user in R and I've just started to work with it to see the distribution of my data but I got stuck on this error. I have a data frame and I would like to plot histograms of it's numeric columns. So what I did is as bellow :
num_data <-my_data[, sapply(my_data, is.numeric)]
for (i in 1:length(names(num_data))){
print(i)
hist( num_data[i], main='hist', breaks=20, prob=TRUE)
}
But I get the error 'Error in hist.default(num_data[i], main = "hist", breaks = 20, prob = TRUE) : 'x' must be numeric ' I checked the type of num_data[i] and it is a list of numeric values. SO I have no idea of what is the problem. Can any one please give me hint?
A side by side ggplot
solution.
library(ggplot2)
library(tidyr)
ggplot(gather(num_data, cols, value), aes(x = value)) +
geom_histogram(binwidth = 20) + facet_grid(.~cols)
More reliable than hist() is the histogram function from the Hmisc package:
library(Hmisc)
hist.data.frame(num_data)
This should print histograms for all columns in your dataframe.
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