title: R is plotting a line way outside of the chart area
body: <p>I am simply plotting some forecast errors, however one of my lines is plotting way outside of the chart area when I am using R's <code>plot</code> function</p>
  
  <p>The data is as follows:</p>
  
  <pre><code>&gt; Errors
           1.week      2.weeks      4.weeks     8.weeks
  1    -0.8315842   -2.0770613   -1.5939279  -1.0221132
  2     2.3557692    1.6248861    3.7038422   5.1803585
  3     4.5628527    3.7731578    6.3575075   9.1854482
  4   -13.9020725  -13.8751169   -9.9692492  -5.7205310
  5   -26.2018878  -25.6789948  -19.6533859 -14.5865603
  6   -15.4871932  -15.2419860   -6.8434238  -0.8066797
  7   -14.1347094  -14.2751777   -4.5532670   2.5371869
  8     7.6573971    7.0516291   20.0454082  29.5035655
  9    14.2423208   11.7158540   26.8344705  38.9592733
  10   12.9404280   10.4012970   23.8946655  35.4711499
  11   13.5389572   11.8270242   22.4562988  32.0706150
  12  -16.0386215  -17.8927906   -9.0232955  -0.9692534
  13   -8.5479951  -11.4090786   -3.6729858   3.3122453
  14  -17.4529120  -21.1515732  -13.8185905  -7.4398603
  15  -26.7000634  -32.3277592  -23.1025683 -15.1729123
  16   -4.0032531  -12.2613379   -1.8825783   6.7213671
  17    8.8957503   -0.9585969    9.9365482  19.0748503
  18   32.0322364   19.9301513   34.8202923  46.4041208
  19   28.0687543   13.6083628   31.6832461  45.0969812
  20   -3.0728661  -16.5312407   -0.9657741  10.3036339
  21   11.7878788   -3.0478064   13.8424842  25.9771667
  22    9.9892550   -4.9871205   11.5740132  23.2690438
  23   22.8998538    6.0118306   22.7025023  35.3195641
  24    5.7808321  -10.5933649    4.4892100  17.1939799
  25   -6.0924242  -21.5923200   -9.2917299   2.1220339
  26  -11.7374904  -28.1082658  -15.9798464  -4.1112579
  27  -15.0147630  -29.3107975  -18.0836088  -6.8478348
  28  -24.9128044  -38.4231537  -27.1156275 -15.6860608
  29  -37.9817750  -51.6920999  -39.2222444 -25.5189189
  30  -13.6706635  -27.6301887  -12.9572997   4.1337481
  31   11.1107518   -1.6798887   12.6577970  30.1665708
  32   31.8661224   19.8344487   34.2043033  52.8466940
  33  -10.3451693  -20.2538434   -7.4683061   9.4857313
  34  -13.6655462  -25.3717809  -11.4776440   7.5315424
  35   11.2209802   -4.4268833   11.5400743  34.4884934
  36   17.5595027   -4.1725697   12.6989773  37.6937120
  37   72.3065693   41.3124760   61.7028494  93.0466741
  38   89.8718428   55.3121569   74.5758621 107.7117030
  39   63.0495238   35.4953908   50.1743506  77.7465922
  40    4.5273250  -13.0854353   -2.6323285  18.1108514
  41  -35.0096805  -48.1653640  -40.5522281 -23.7343486
  42  -38.8347996  -52.1927711  -44.3939981 -26.6579849
  43  -22.7564612  -40.4697479  -30.9755202  -8.8881556
  44  -13.3679435  -33.7536109  -23.0032210   2.4724771
  45  -21.5969388  -39.8752151  -29.9660974  -5.3971963
  46  -22.2257732  -40.7611160  -30.0873218  -2.5576712
  47   41.9854318   17.0388007   32.5581635  72.6495345
  48   -4.7979058  -22.0000000   -9.4891390  22.1506720
  49    0.8379237  -16.0771325   -2.3059105  31.0642555
  50  -48.0432432  -64.6712707  -52.6205779 -23.2243465
  51  -31.9405286  -50.1658080  -38.1287671  -6.7165479
  52   13.3228700   -6.7078972    5.6320178  39.4271923
  53   -9.9223744  -28.5279383  -18.3334270  10.8911537
  54  -53.0358796  -69.7852611  -60.7242951 -33.7608786
  55  -89.4042056 -106.8017795  -97.2221262 -66.1765325
  56 -103.2912736 -117.4078156 -109.6670551 -81.5685855
  57  -72.8317422  -89.7210127  -80.3448276 -46.6401129
  58  -10.6460606  -33.5872690  -21.9263346  23.1584507
  59   44.2416769   18.7887617   30.1124849  78.4170944
  60   44.5294118   20.8873684   30.3804447  73.9218079
  61   10.4536213  -11.1676424   -2.9950724  35.7541848
  62  -13.4498715  -33.8472297  -26.4354588  10.9618605
  63  -63.7424837  -83.6746464  -77.0424528 -42.0920245
  64  -48.7203166  -74.8127054  -65.6121866 -20.2087413
  65  -54.8806366  -77.7627958  -69.0863171 -28.6426332
  66  -23.3034759  -46.2179700  -37.3916828   3.1970803
  67   -0.4412955  -23.6060606  -14.4324853  28.0687361
  68  -39.1934605  -58.2712826  -50.0247934 -13.7366842
  69   -6.1793103  -26.9323006  -17.4225871  21.8382838
  70  -67.7006993  -86.3950260  -77.7722806 -44.0970399
  71  -95.0128023 -112.5663925 -104.3164426 -73.0256679
  72  -58.8480463  -81.8627685  -71.4795383 -31.1377660
  73  -31.9423077  -54.7657492  -45.3222698  -3.9940266
  74   19.1490964   -3.2852665    5.1545455  50.2359800
  75   11.1428571   -7.3954082    0.8880652  43.2303546
  76   36.2714724   16.8534538   27.1051243  74.8324168
  77  -18.1261682  -37.0353403  -27.1089450  18.6923529
  78   -4.6456693  -25.0848244  -14.1691176  37.1199284
  79  -55.9234450  -70.8848485  -61.7751479 -22.0358990
  80  -80.6779935  -92.1077763  -84.1910700 -54.3332299
  81  -63.1845140  -74.0436590  -66.2472325 -38.5645570
  82  -27.2136895  -45.7618041  -30.1320755  20.0032362
  83  -45.6570458  -61.3812950  -45.2886109   0.1458056
  84   59.9193825   35.7708029   65.4523810 142.0542107
  85   77.8921739   53.8424963   87.0364701 170.8487600
  86  191.6063269  163.8654573  209.0661157 321.5901464
  87   62.0849558   46.1521906   84.5931883 167.5243004
  88   92.6666667   81.5545171  126.6058394 210.9166035
  89    3.2517986   -2.0382166   30.7330657  87.3248731
  90  -19.4141049  -20.6461039    7.3760903  55.6041667 
  </code></pre>
  
  <p>Below is the code I have used to plot these.</p>
  
  <pre><code>x1 = rep(1:90)
  
  z1 = Errors[[1]]
  z2 = Errors[[2]]
  z3 = Errors[[3]]
  Z4 = Errors[[4]]
  
  plot(x1,z1,type="l",col="red", bty="L", xlab="Forecast Days",ylab="Error") #Plot first line
  points(x1,z2,type="l",col="blue") #Add second
  points(x1,z3,type="l",col="darkgoldenrod2") #Add third 
  points(x1,z4,type="l", lwd=3, col="green") #Add fourth
  </code></pre>
  
  <p>When the fourth line is plotted, it is way above the others, off the chart area and partially outside of the viewing window.  When I have plotted them in the reverse order (4th to 1st) the 4th line plots fine and the 3rd to 1st plot way below the chart area in a similar fashion.  I'm getting no sort of error message and I can't find any other examples of this to understand why this is happening.  </p>
  
  <p>I have used the same code and method to plot the original forecast data (the data the errors have been calculated for) and had no such issues.</p>
  
  <p>I know I can use ggplot2 also for charting, however I do still use this method sometimes. Any help is appreciated.</p>
  
  <p>Using some suggested changes to the code to include the <code>ylim</code> still produces a similar result:</p>
  
  <pre><code>plot(x1,z1,type="l",col="red", bty="L", xlab="Forecast Days",ylab="Error", ylim = c(min(Errors),max(Errors)))  #Plot first destination
  points(x1,z2,type="l",col="blue")                                                #Addition of second destination
  points(x1,z3,type="l",col="darkgoldenrod2")                                               #Addition of a third destination
  points(x1,z4,type="l", lwd=3, col="green")                                     #Addition of a third destination
  </code></pre>
  
  <p>The fourth line has come down but is still way off from where it should be as the data is all similar.</p>
  
  <p><a href="https://i.stack.imgur.com/kcHuN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kcHuN.png" alt="enter image description here"></a></p>