Re: [R] Chart will not display

[phil]

Thanks Bert. That did it.

Philip

On 2020-06-02 22:02, Bert Gunter wrote:

In a function you must explicitly print/plot the ggplot() object, I
assume. i.e. plot(ggplot(...)) etc.

I do not use ggplot, so if I'm wrong, sorry.  But try it.  Hopefully
someone else will get it right if it doesn't do it.

Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Tue, Jun 2, 2020 at 6:46 PM <p...@philipsmith.ca> wrote:

I have made what must be a simple mistake, but I have not been able
to
find it.

I create a function to plot a chart for a single variable. I want to

display separate charts for several variables, one after another,
with
"Press [enter] to continue" in between. The function works fine for
a
single variable, but when I try to display several variables
consecutively, using a for statement, no charts are displayed. The
for
statement executes without apparent error, but no charts appear.

Here is a reprex.

library(tidyverse)
t <- c(1,2,3,4,5)
a <- c(1,4,5,8,7)
b <- c(2,2,5,3,1)
c <- c(3,6,2,8,3)
df <- data.frame(t=t,a=a,b=b,c=c)
df1 <- pivot_longer(df,cols=c(a,b,c),names_to="var",values_to="val")
chfn <- function(chnm) {
ggplot(filter(df1,var==chnm),aes(x=t,y=val,group=1)) +
geom_line() +
labs(title=chnm)
}
chfn("b") # test of the function - it works
chnms <- c("a","b","c")
for (i in chnms) {
chfn(i)
readline(prompt="Press [enter] to continue")
}

Thanks for your help.

Philip

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