fault in my grouped barchart coding!

this is my dataset:

this is my coding:

alcoholpercentage=rep(0:2, each=4)
embryograding=rep(c("gradeone","gradetwo","gradethree","gradefour"), times=3)
numberofembryos=sample(0:11, 12)

however, this dataframe completely changes the number of embryos from my original dataset. I think the '=sample' bit is wrong but I'm not completely sure how this works.


you can read R's help documentation for available function by the ? symbol in the console


the purpose of sample is to randomly select from something.
If you have measured data for number of embryos, where is it / what form is it in ?

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