Error in -x : invalid argument to unary operator

[Alejandra_Zazueta]

Hi I'm trying to plot my data using ggplot2 but I'm getting this error I've never seen before... I was searching online and couldn't find anything useful.

This is my code:

##PACKAGES

library(ggplot2)
library(viridis)
library(hrbrthemes)

##IMPORT DATA
library(readxl)
TOC_LANG <- read_excel("PHD/LAB/LAB RESULTS/Jul-2021- TOC/TOC- LAN and GROVE AV/vario016_TOC_MOD.xlsx",
sheet = "R", range = "B3:E55")

#IMPORT DATA

library(readxl)
TOC_PORTGA <- read_excel("PHD/LAB/LAB RESULTS/Jul-2021- TOC/TOC- LAN and GROVE AV/vario016_TOC_MOD.xlsx",
sheet = "R", range = "A59:E105")

View(TOC_LANG)

########NUMERIC
TOC_LANG$TOC = as.numeric(TOC_LANG$TOC)
is.numeric(TOC_LANG$TOC)

TOC_LANG$Macroalgae = as.numeric(TOC_LANG$Macroalgae)
is.numeric(TOC_LANG$Macroalgae)

FIRST CODE

ggplot(TOC_LANG,aes(x=Depth,y=TOC, group=Macroalgae)) +
geom_line(aes(color=Macroalgae),size=.5, linetype=1) +
geom_point() +
scale_x_reverse() +
scale_y_continuous( position="right") +
labs(title ="TOC_LANG (%C)", x= "Depth (cm)", y="TOC (%C)") +
coord_flip()

thank you!

[andresrcs]

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…