Because the range is so different between the two series, I'd suggest using log="y", ylim=c(500,20000)

Clint Bowman                    INTERNET:       cl...@ecy.wa.gov
Air Quality Modeler             INTERNET:       cl...@math.utah.edu
Department of Ecology           VOICE:          (360) 407-6815
PO Box 47600                    FAX:            (360) 407-7534
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On Mon, 23 Mar 2015, Boris Steipe wrote:

... and that gives you a "double ordinate plot", a staple of misleading 
statistics.

Let me give you an analogy:

Imagine you are on a chemistry mailing list and someone asks about the proper way to mix 
aluminum powder with fertilizer. Of course, as a chemist you know how. But still - and 
the same holds for the "double ordinate plot" - just say no.


:-)


For reference (taken from a post on SO):
Junk charts:
 http://junkcharts.typepad.com/junk_charts/2006/06/illusion_of_suc.html
 http://junkcharts.typepad.com/junk_charts/2006/05/the_crossover_l.html
Perecptual Edge ( a more detailed analysis)
 
http://www.perceptualedge.com/articles/visual_business_intelligence/dual-scaled_axes.pdf
SMBC's tutorial on infographics (point 4).
 http://www.smbc-comics.com/?id=3167



On Mar 23, 2015, at 2:14 PM, Clint Bowman <cl...@ecy.wa.gov> wrote:

Agreed--I neglected to add the secondary y-axis (shouldn't hit send so fast.)

Clint Bowman                    INTERNET:       cl...@ecy.wa.gov
Air Quality Modeler             INTERNET:       cl...@math.utah.edu
Department of Ecology           VOICE:          (360) 407-6815
PO Box 47600                    FAX:            (360) 407-7534
Olympia, WA 98504-7600

       USPS:           PO Box 47600, Olympia, WA 98504-7600
       Parcels:        300 Desmond Drive, Lacey, WA 98503-1274

On Mon, 23 Mar 2015, Boris Steipe wrote:

... which is exactly what he shouldn't do because now it the plot falsely 
asserts that both curves are plotted to the same scale.


B.



On Mar 23, 2015, at 12:34 PM, Clint Bowman <cl...@ecy.wa.gov> wrote:

Try:
plot(Date,MORTSBu,lwd=2,lty="dashed",axes=F,xlab="",ylab="")



Clint Bowman                    INTERNET:       cl...@ecy.wa.gov
Air Quality Modeler             INTERNET:       cl...@math.utah.edu
Department of Ecology           VOICE:          (360) 407-6815
PO Box 47600                    FAX:            (360) 407-7534
Olympia, WA 98504-7600

      USPS:           PO Box 47600, Olympia, WA 98504-7600
      Parcels:        300 Desmond Drive, Lacey, WA 98503-1274

On Mon, 23 Mar 2015, varin sacha wrote:

Dear R-Experts,

I try to superimpose/present 2 curves/plots on the same graph. I would like the 
result/graph to be readable.
For that, I use the par(new=TRUE) argument but on the Y-axis there is a 
superposition of writings and the Y-axis becomes unreadable.
How can I solve this problem ?

Here is a reproducible example :
Date<-c(1970,1971,1972,1973,1974,1975,1976,1977,1978,1979,1980,1981,1982,1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010)

MORTSFr<-c(16445,17671,18113,17043,14738,14355,15028,14283,13229,13603,13672,13547,13527,13021,12737,11388,11947,10742,11497,11476,11215,10483,9900,9568,9019,8891,8541,8444,8918,8487,8079,8160,7655,6058,5593,5318,4709,4620,4275,4273,3992)

MORTSBu<-c(838,889,934,946,960,1030,1021,1040,1153,1149,1199,1219,1229,1123,1119,1113,1070,1153,1153,1280,1567,1114,1299,1307,1390,1264,1014,915,1003,1047,1012,1011,959,960,943,957,1043,1006,1061,901,776)

plot(Date,MORTSFr,type="l")
par(new=TRUE)

plot(Date,MORTSBu,lwd=2,lty="dashed")

Thanks for your time.
Best,
S

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