i have this error when i try to use kmeans() function Error in sample.int(m, k) : invalid first argument ...what's the problem

```
km<-kmeans(df,4)
```

i have this error when i try to use kmeans() function Error in sample.int(m, k) : invalid first argument ...what's the problem

```
km<-kmeans(df,4)
```

I would compare the format of `df`

to the format of `x`

in the example given in `?kmeans`

:

```
x <- rbind(matrix(rnorm(100, sd = 0.3), ncol = 2),
matrix(rnorm(100, mean = 1, sd = 0.3), ncol = 2))
colnames(x) <- c("x", "y")
(cl <- kmeans(x, 2))
```

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