Error in -`*tmp*` : invalid argument to unary operator [closed] - r

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No line number is given, for the error, in an R script. Googling didn't help.
What's the problem?


I had meant to put this line in the script:
# -----------
but instead it was this line.
-----------

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Query in R in relation to dataframe [closed]

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I'm trying to run a long code, but the error I'm getting on Rstudio is
Error in data.frame(..., check.names = FALSE) :
arguments imply differing number of rows: 0, 75
how do I resolve this?
expecting to get a csv file in the end

How to add variables without "$" [closed]

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I want to run a binary logistic regression in R but I see this error:
Error in if (!length(fname) || !any(fname == zname)) { :
missing value where TRUE/FALSE needed
It happens because I use variables with $. For example data$HEIGHT.
I use read.table() for importing .txt file.
How can I use HEIGHT instead of data$HEIGHT?

How to add parentheses between numbers? I know how to add dashes, are they doing the same way? [closed]

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how to add parentheses between numbers? I know how to add dashes, are they doing the same way? like 123456789 to (123)456789 in R programming?

sub("(\\d{3})", "(\\1)", 123456789)
[1] "(123)456789"

R programming graphics command [closed]

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What is the R command to write the caption of the figure using R language so that the caption of the figure can be given below the plot.

in Rmarkdown:
```{r my_fig_with_caption, fig.cap=fn('My Figure')}
plot(rnorm(100)
```
see: http://www.rstudio.com/ide/docs/authoring/using_markdown.

R : Do not understanding the objective of a code [closed]

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Given the following setup:
area.factor <- cut(state.x77[,"Area"],
breaks=quantile(state.x77[,"Area"],c(0,.25,.75,1)),
labels=c("small","medium","large"),
include.lowest=TRUE)
state <- data.frame(pop=state.x77[,"Population"],
inc=state.x77[,"Income"],
area=area.factor,
region=state.region)
pop.area.region <- with(state,ftable(pop,area,region))
The following two lines of code are show the same result:
head(ftable(prop.table(pop.area.region,margin=2)))
head(prop.table(pop.area.region,margin=2))
I don't understand what effect adding ftable has, if any, in:
head(ftable(prop.table(pop.area.region,margin=2)))

Adding ftable witll try to coerce the pop.area.region to a ftable class. Here
No need to add ftable since pop.area.region is already an ftable.
identical(ftable(prop.table(pop.area.region,margin=2)),
prop.table(pop.area.region,margin=2))
TRUE

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