R: Data frame index error “unexpected token”

Objective: to practice PCA analysis with prcomp function
data set: R comes with iris data set
error reporting content: when removing the “species” column in Iris data set with data frame index, errors are always reported, as follows:

> iris_data <- [,-5] 
Error: Unexpected'[' in "iris_data <- ["

Oh, it’s really a very low-level error. The reason for the error is that the data set is not indicated. After modification, the code is as follows:

iris_data <- iris[,-5]

the second similar problem:
original code:

fviz_pca_ind(iris.pca,
             geom.ind = ("point", "text"), # show points only (nbut not "text")
             col.ind = iris$Species, # color by groups
             palette = c("#00AFBB", "#E7B800", "#FC4E07"),
             addEllipses = TRUE, # Concentration ellipses
             legend.title = "Groups"
             )

report errors:

Error: Unexpected',' in:
"fviz_pca_ind(iris.pca,
             geom.ind = ("point","

Modified code: added “C” in front

fviz_pca_ind(iris.pca,
             geom.ind = c("point", "text"), # show points only (nbut not "text")
             col.ind = iris$Species, # color by groups
             palette = c("#00AFBB", "#E7B800", "#FC4E07"),
             addEllipses = TRUE, # Concentration ellipses
             legend.title = "Groups"
             )


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