Pass data CSV file to array in R (BARPLOT)

Question

I need to plot a graph in R by importing a csv file. After importing csv and calling the barplot he accuses that the variable I imported csv is not a vector. So how do I turn it into a vector to use in the barplot? Tbm would like to use the header of each column to name the respective bar, is there a way? The file is simple; it only has 2 lines, one with the headers and the other with the corresponding values.

I tried so first:

    > data <- read.csv("tabela4_p2.csv", header = TRUE)
    > names <- c("Bancos", "Arborização", "EstComerc", "CasaResid","EdifResid", "ConstAband")

    barplot(as.integer(data$Bancos, data$Arborização, data$EstComerc, data$CasaResid, data$EdifResid, data$ConstAband), names.arg = names)

And gave this here:

    Error in barplot.default(as.integer(data$Bancos, data$Arborização,data$EstComerc,: 
    número incorreto de nomes

Then I used it like this:

    barplot(data, names.arg = names)

And gave:

    Error in barplot.default(data, names.arg = names) : 
    'height' deve ser um vetor ou uma matriz

Answer 1

I believe what you want is something like this:

x <- data.frame(x = 1, y = 2, z = 3)
names(x) <- c("a", "b", "c")
barplot(height = as.numeric(x[1,]), names.arg = names(x))

Note that:

> as.integer(1,2,3)
[1] 1

In other words, it is a scalar and not a vector. Your code could work by doing:

barplot(as.integer(c(data$Bancos, data$Arborização, data$EstComerc, data$CasaResid, data$EdifResid, data$ConstAband)), names.arg = names)

See that inside the as.integer put the function c that concatenates the elements, before you call the as.integer.