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> ## killed by 0 prior to 1.4.0 and in 1.4.1:
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> ## killed by 0 prior to 1.4.0 and in 1.4.1:
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> t1 <- ts(0:100)
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> t1 <- ts(0:100)
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> ## only warnings about values <= 0
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> ## only warnings about values <= 0
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> plot(t1, log = "y")
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> plot(t1, log = "y")
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Warning in xy.coords(x, NULL, log = log) : one y value <= 0 omitted from logarithmic plot
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Warning in xy.coords(x, NULL, log = log) : 1 y value <= 0 omitted from logarithmic plot
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> plot(cbind(t1, 10*t1, t1 - 4), log="y", plot.type = "single")
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> plot(cbind(t1, 10*t1, t1 - 4), log="y", plot.type = "single")
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Warning in xy.coords(x = matrix(rep.int(tx, k), ncol = k), y = x, log = log) :
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Warning in xy.coords(x = matrix(rep.int(tx, k), ncol = k), y = x, log = log) :
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	 7 y values <= 0 omitted from logarithmic plot
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	 7 y values <= 0 omitted from logarithmic plot
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> stopifnot(par("usr")[4] > 3) # log10: ylim[2] = 1000
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> stopifnot(par("usr")[4] > 3) # log10: ylim[2] = 1000
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