plotSeq | R Documentation |

`plotSeq`

is a convenience for the creation of sequence
across the range of a variable.
By default, the length of the plotting
sequence will be equal to the length of the original sequence.
In that case, the only effect is to create an evenly-spaced
set of values. If `length.out`

is specified, the user
determines the number of elements in plotSeq.

plotSeq(x, length.out = length(x))

`x` |
an R vector variable |

`length.out` |
the number of elements in the desired plotting sequence. |

The primary intended usage is for the creation of plotting sequences of numeric variables. It takes a variable's range and the fills in evenly spaced steps. If x is a factor variable, the levels will be returned. Uses of this functionality are planned in the future.

`pretty`

#Create a quadratic regression stde <- 14 x <- rnorm(100, m = 50, s = 10) y <- 0.2 - 02*x + 0.2*x^2 + stde*rnorm(100) mod1 <- lm (y ~ poly(x, 2)) plot(x, y, main="The Quadratic Regression") seqx <- plotSeq(x, length.out = 10) seqy <- predict(mod1, newdata = data.frame(x = seqx)) lines(seqx, seqy, col = "red") # Notice the bad result when a plotting sequence is # not used. plot(x, y, main = "Bad Plot Result") seqy <- predict(mod1) lines(x, seqy, col = "green")

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