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Jim, Thanks for responding! I am using the official R 3.5.0 for Mac OS X. This apparently does not include library (plotrix) library(plotrix) Error in library(plotrix) : there is no package called ?plotrix? Greg > On May 5, 2018, at 6:50 PM, Jim Lemon <drjimlemon at gmail.com> wrote: > > Hi Greg, > What you are getting there is a factor, interpreted as a 1:n sequence >

Thanks. Regarding axis(1,at=x_yyyymmdd,labels=format(x_yyyymmdd,"%Y-%m-%d")) How do I get the text for YYYY-MM-DD to be drawn vertically, instead of horizontally? Greg > On May 6, 2018, at 11:54 PM, Jim Lemon <drjimlemon at gmail.com> wrote: > > axis(1,at=x_yyyymmdd,labels=format(x_yyyymmdd,"%Y-%m-%d")) [[alternative HTML version deleted]]

I do not see any difference between the x versus y plot drawn in blue, and the y only plot drawn in red. Is the correct? Greg y_duration <- c (301.59050, 387.35700, 365.64366, 317.26150, 321.71883, 342.44950, 318.95350, 322.33233, 330.60333, 428.99516, 297.82066, 258.23166, 282.01816, 280.00000) x_yyyymmdd <-as.Date(c ("2018-04-25", "2018-04-26", "2018-04-27",

Jim, That you very much! How do I instruct staxlab to label once every n days, rather than labeling every day? Greg > On May 5, 2018, at 6:50 PM, Jim Lemon <drjimlemon at gmail.com> wrote: > > staxlab(1,at=x_yyyymmdd,labels=format(x_yyyymmdd,"%Y-%m-%d")) [[alternative HTML version deleted]]

Since the horizontal axis side=1 is year-month-day, how do I issue an abline command to draw dashed vertical lines, as a background grid, within the graph?s border? Similar to the abline command I call below, in blue, for dashed horizontal lines, as a background grid. Greg y_duration <- c (301.59050, 387.35700, 365.64366, 317.26150, 321.71883, 342.44950, 318.95350, 322.33233, 330.60333,

Jim, Thank you very much! How do I use the axis command for side=1 to label the x horizontal axis, in the format="%Y-%m-%d? style? Greg y_duration <- c (301.59050, 387.35700, 365.64366, 317.26150, 321.71883, 342.44950, 318.95350, 322.33233, 330.60333, 428.99516, 297.82066, 258.23166) x_yyyymmdd <-as.Date(c ("2018-04-25", "2018-04-26",

I am using R 3.5.0 for Mac OS X. Issuing these two commands yields the expected plot. y_duration <- c (301.59050, 387.35700, 365.64366, 317.26150, 321.71883, 342.44950, 318.95350, 322.33233, 330.60333, 428.99516, 297.82066) plot (y_duration, type="l?) Adding Year-Month-Day values for the x axis, and then calling plot (x,y), yields a bizarre plot. Apparently, R does not