Dear all,
I have a dataframe with a column representing the names of the
elements (a, b, etc) and one with their frequencies.
How can I plot the frequencies so that each element has an associated
frequency value?
I have been thinking of a histogram, but I have found it difficult to
implement. I have tried the following:
group <- c("a", "b", "c", "d",
"e")
freq <-c(1, 2, 2, 5, 3)
df <- data.frame(group, freq, stringsAsFactors = FALSE)
hist(df$freq)
library(lattice)
histogram( ~ df$group)
histogram( ~ as.factor(df$group))
histogram(df$freq ~ as.factor(df$group))
hist(df$freq) returns a histogram in which the values 1 and 2 appear 3
times, the values 3 and 5 appear once and 4 never. This is not what I
wanted; I want instead a graph telling me that a appears once, b twice
etc.
histogram( ~ df$group) gives the error:
Error in hist.default(as.numeric(x), breaks = breaks, plot = FALSE,
include.lowest = include.lowest, :
negative length vectors are not allowed
histogram( ~ as.factor(df$group)) and histogram(df$freq ~
as.factor(df$group)) report all groups on the x axis (that is good)
but all at 20% level.
What am I missing?
Thank you.
--
Best regards,
Luigi
Hi,
Is this what you are after?
group <- c("a", "b", "c", "d",
"e")
freq <-c(1, 2, 2, 5, 3)
x = rep(group, freq)
barplot(table(x))
Cheers,
Ben
> On Jun 7, 2018, at 6:00 AM, Luigi Marongiu <marongiu.luigi at
gmail.com> wrote:
>
> Dear all,
> I have a dataframe with a column representing the names of the
> elements (a, b, etc) and one with their frequencies.
> How can I plot the frequencies so that each element has an associated
> frequency value?
> I have been thinking of a histogram, but I have found it difficult to
> implement. I have tried the following:
>
> group <- c("a", "b", "c", "d",
"e")
> freq <-c(1, 2, 2, 5, 3)
> df <- data.frame(group, freq, stringsAsFactors = FALSE)
> hist(df$freq)
> library(lattice)
> histogram( ~ df$group)
> histogram( ~ as.factor(df$group))
> histogram(df$freq ~ as.factor(df$group))
>
> hist(df$freq) returns a histogram in which the values 1 and 2 appear 3
> times, the values 3 and 5 appear once and 4 never. This is not what I
> wanted; I want instead a graph telling me that a appears once, b twice
> etc.
>
> histogram( ~ df$group) gives the error:
> Error in hist.default(as.numeric(x), breaks = breaks, plot = FALSE,
> include.lowest = include.lowest, :
> negative length vectors are not allowed
>
> histogram( ~ as.factor(df$group)) and histogram(df$freq ~
> as.factor(df$group)) report all groups on the x axis (that is good)
> but all at 20% level.
>
> What am I missing?
> Thank you.
>
> --
> Best regards,
> Luigi
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org
Ecological Forecasting: https://eco.bigelow.org/
[[alternative HTML version deleted]]
exactly! Thank you! but it is possible to do it with lattice? I might have an extra level of information, for instance super-group, and in that case, I could plot all the supergroup easily together. On Thu, Jun 7, 2018 at 12:48 PM Ben Tupper <btupper at bigelow.org> wrote:> > Hi, > > Is this what you are after? > > group <- c("a", "b", "c", "d", "e") > freq <-c(1, 2, 2, 5, 3) > x = rep(group, freq) > barplot(table(x)) > > Cheers, > Ben > > > > On Jun 7, 2018, at 6:00 AM, Luigi Marongiu <marongiu.luigi at gmail.com> wrote: > > Dear all, > I have a dataframe with a column representing the names of the > elements (a, b, etc) and one with their frequencies. > How can I plot the frequencies so that each element has an associated > frequency value? > I have been thinking of a histogram, but I have found it difficult to > implement. I have tried the following: > > group <- c("a", "b", "c", "d", "e") > freq <-c(1, 2, 2, 5, 3) > df <- data.frame(group, freq, stringsAsFactors = FALSE) > hist(df$freq) > library(lattice) > histogram( ~ df$group) > histogram( ~ as.factor(df$group)) > histogram(df$freq ~ as.factor(df$group)) > > hist(df$freq) returns a histogram in which the values 1 and 2 appear 3 > times, the values 3 and 5 appear once and 4 never. This is not what I > wanted; I want instead a graph telling me that a appears once, b twice > etc. > > histogram( ~ df$group) gives the error: > Error in hist.default(as.numeric(x), breaks = breaks, plot = FALSE, > include.lowest = include.lowest, : > negative length vectors are not allowed > > histogram( ~ as.factor(df$group)) and histogram(df$freq ~ > as.factor(df$group)) report all groups on the x axis (that is good) > but all at 20% level. > > What am I missing? > Thank you. > > -- > Best regards, > Luigi > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > > Ben Tupper > Bigelow Laboratory for Ocean Sciences > 60 Bigelow Drive, P.O. Box 380 > East Boothbay, Maine 04544 > http://www.bigelow.org > > Ecological Forecasting: https://eco.bigelow.org/ > > > > >-- Best regards, Luigi
also, with this approach, I need to re-arrange the data. Is it possible to work directly on a dataframe? On Thu, Jun 7, 2018 at 12:48 PM Ben Tupper <btupper at bigelow.org> wrote:> > Hi, > > Is this what you are after? > > group <- c("a", "b", "c", "d", "e") > freq <-c(1, 2, 2, 5, 3) > x = rep(group, freq) > barplot(table(x)) > > Cheers, > Ben > > > > On Jun 7, 2018, at 6:00 AM, Luigi Marongiu <marongiu.luigi at gmail.com> wrote: > > Dear all, > I have a dataframe with a column representing the names of the > elements (a, b, etc) and one with their frequencies. > How can I plot the frequencies so that each element has an associated > frequency value? > I have been thinking of a histogram, but I have found it difficult to > implement. I have tried the following: > > group <- c("a", "b", "c", "d", "e") > freq <-c(1, 2, 2, 5, 3) > df <- data.frame(group, freq, stringsAsFactors = FALSE) > hist(df$freq) > library(lattice) > histogram( ~ df$group) > histogram( ~ as.factor(df$group)) > histogram(df$freq ~ as.factor(df$group)) > > hist(df$freq) returns a histogram in which the values 1 and 2 appear 3 > times, the values 3 and 5 appear once and 4 never. This is not what I > wanted; I want instead a graph telling me that a appears once, b twice > etc. > > histogram( ~ df$group) gives the error: > Error in hist.default(as.numeric(x), breaks = breaks, plot = FALSE, > include.lowest = include.lowest, : > negative length vectors are not allowed > > histogram( ~ as.factor(df$group)) and histogram(df$freq ~ > as.factor(df$group)) report all groups on the x axis (that is good) > but all at 20% level. > > What am I missing? > Thank you. > > -- > Best regards, > Luigi > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > > Ben Tupper > Bigelow Laboratory for Ocean Sciences > 60 Bigelow Drive, P.O. Box 380 > East Boothbay, Maine 04544 > http://www.bigelow.org > > Ecological Forecasting: https://eco.bigelow.org/ > > > > >-- Best regards, Luigi