barplot + plot

-----Original Message-----
Dear all,
I've got another question,
By default barplot and plot seem to produce slightly different y-axis.
The problem I've got is when using a mix figure with both, barplot and
plot. For example:

barplot(1:5, ylim=c(0, 6))
par(new= T)
plot(1:5, 9:5, type="b", axes=FALSE, ylim=c(0,9))
axis(4)
box()

note that both plots (barplot and plot) should start at 0, but the

exact

starting at 0 is only produced with barplot but not with plot.
Is there a way to make the two axes more coherent, that is both

starting

at the exact 0 or both starting like the plot?

Thanks a lot for any suggestion

Juli

Juli,

The difference is in the way that barplot() and plot() draw the style of
axes by default.

In barplot(), which you call first, it sets par(yaxs = "i") explicitly
in the code.

Unless you change it, plot() uses the default parameter value of
par(yaxs = "r"), which draws a different style of axis.

If you add:

par(yaxs = "i") before your plot(...) line, you will get a consistent 0
starting point.

See ?par and scroll to par(xaxs), which describes the style of axes
available for both x and y.

Thus, your example code should look like:

barplot(1:5, ylim=c(0, 9))
par(new= T)
par(yaxs = "i")
plot(1:5, 9:5, type="b", axes=FALSE, ylim=c(0,6))
axis(4)
box()

I presume that you explicitly want the y axis ranges to be different.
If not, be sure to set ylim to the same values.

HTH.

Marc Schwartz



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