Change element of vector
colors = c("red", "blue", "green")
colors # "red", "blue", "green"
colors[1] # red
colors[1] = "purple"
colors # "purple", "blue", "green"
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colors = c("red", "blue", "green")
colors # "red", "blue", "green"
colors[1] # red
colors[1] = "purple"
colors # "purple", "blue", "green"