
Hi all,
I have two line graphs drawn with two different pairs of x and y vectors.
The sample dataset is given below. Here, I have two X vectors assuming positive values. 
Only one of the y vectors assumes positive values, while the other y vector assumes negative values.


    
        
            

            
                
                
                    
                        
X1
                        
Y1
                        
X2
                        
Y2
                    
                    
                        
35
                        
0.000534
                        
265
                        
-0.000534
                    
                    
                        
47
                        
0.000639
                        
281
                        
-0.000570
                    
                    
                        
65
                        
0.000744
                        
282
                        
-0.000572
                    
                    
                        
865
                        
0.001312
                        
283
                        
-0.000575
                    
                    
                        
1265
                        
0.001342
                        
284
                        
-0.000579
                    
                    
                        
1315
                        
0.001346
                        
285
                        
-0.000584
                    
                    
                        
1325
                        
0.001347
                        
885
                        
-0.001635
                    
                    
                        
1472
                        
0.001362
                        
886
                        
-0.001636
                    
                    
                        
1477
                        
0.001364
                        
887
                        
-0.001637
                    
                    
                        
1536
                        
0.001386
                        
888
                        
-0.001638
                    
                    
                        
1541
                        
0.001388
                        
889
                        
-0.001640
                    
                    
                        
2492
                        
0.001617
                        
890
                        
-0.001641
                    
                    
                        
2506
                        
0.001622
                        
920
                        
-0.001688
                    
                    
                        
2516
                        
0.001626
                        
970
                        
-0.001761
                    
                
            
            
I am able to plot them as separate graphs using :
pdf("plot.pdf", height=9, width=6)
par(mfrow=c(1,2))
plot(y=y1, x=x1, lwd=2, col="blue", type="l")
plot(y=y2, x=x2, lwd=2, col="red", type="l")
dev.off()
but would like to plot them on one graph in a X-Y coordinate system setup . 
The idea is to somehow flip one of the curves to the third quadrant of the X-Y coordinate space while the other curve is in the first quadrant. 
How do I plot the two graphs in one figure ??? 
Any help would be highly useful.

        
    

Rajat Tayal
Ph.D Economics Candidate
Indira Gandhi Institute of Development Research,
Gen A.K.Vaidya Marg, Filmcity Road,
Santosh Nagar, Goregaon (East),
MUMBAI- 400 065.
02228416285, 09987284080
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