title: R: making tick marks at specified intervals on x-axis when number are large
body: <p>I know this seems trivial, but for some reason, I cannot figure out how to do this.</p>
  
  <p>I have made this plot</p>
  
  <p><img src="https://i.imgur.com/rZVOizm.png" alt="plot">  </p>
  
  <p>using these commands: </p>
  
  <pre><code>data1 &lt;- read.table("data_for_question.txt", sep="\t", header=TRUE)
  plot(data1, type="l", lwd=2)
  </code></pre>
  
  <p>from data I will add below.</p>
  
  <p>It's a nice enough plot but the tick marks and numbers are too far apart.  I would like to have a tick mark at every 4th data point, which would be in increments of 20,000 time points, rather than 50,00 as shown here.</p>
  
  <p>I apologize for the long list of data, but the number of data points being graphed appears to be relevant to my issues in tick marking.</p>
  
  <p>Thanks!</p>
  
  <p><strong><em>I know this seems like a duplicate, but I have checked, for hours, other questions like it and none of the solutions worked for me for some reason.</em></strong></p>
  
  <p>data:</p>
  
  <pre><code>Time    Counts
  0   29
  5000    68
  10000   55
  15000   34
  20000   61
  25000   47
  30000   42
  35000   39
  40000   25
  45000   3
  50000   30
  55000   2
  60000   36
  65000   29
  70000   13
  75000   13
  80000   17
  85000   11
  90000   10
  95000   29
  100000  20
  105000  8
  110000  0
  115000  1
  120000  1
  125000  1
  130000  1
  135000  0
  140000  6
  145000  0
  150000  0
  155000  0
  160000  0
  165000  0
  170000  0
  175000  0
  180000  4
  185000  0
  190000  0
  195000  0
  200000  0
  205000  0
  210000  0
  215000  0
  220000  0
  225000  0
  230000  0
  235000  0
  240000  0
  245000  0
  250000  0
  255000  0
  260000  87
  265000  0
  270000  0
  275000  0
  280000  0
  285000  0
  290000  0
  295000  0
  300000  0
  305000  0
  310000  0
  315000  1
  320000  1
  325000  0
  330000  0
  335000  1
  340000  0
  345000  0
  350000  0
  355000  2
  360000  0
  365000  0
  370000  1
  375000  0
  380000  0
  385000  0
  390000  0
  395000  0
  400000  0
  405000  2
  410000  0
  415000  3
  420000  0
  425000  0
  430000  0
  435000  0
  440000  0
  445000  0
  450000  1
  455000  0
  460000  0
  465000  2
  470000  0
  475000  1
  480000  3
  485000  0
  490000  0
  495000  1
  500000  0
  505000  0
  510000  0
  515000  1
  520000  0
  525000  0
  530000  0
  535000  0
  540000  0
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  555000  0
  560000  0
  565000  0
  570000  0
  575000  0
  580000  0
  585000  0
  590000  0
  595000  0
  600000  0
  605000  0
  610000  1
  615000  11
  620000  1
  625000  2
  630000  3
  635000  0
  640000  3
  645000  2
  650000  6
  655000  7
  660000  1
  665000  5
  670000  1
  675000  1
  680000  2
  685000  0
  690000  0
  695000  3
  700000  0
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  780000  0
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  790000  2
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  815000  4
  820000  0
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  830000  1
  835000  0
  840000  0
  845000  0
  850000  0
  855000  0
  860000  0
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  875000  0
  880000  0
  885000  1
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  930000  1
  935000  0
  940000  2
  945000  0
  950000  1
  955000  0
  960000  0
  965000  0
  970000  11
  975000  2
  980000  0
  985000  1
  990000  0
  995000  0
  1000000 0
  1005000 4
  1010000 0
  1015000 2
  1020000 0
  1025000 0
  1030000 2
  1035000 0
  1040000 0
  1045000 0
  1050000 0
  1055000 0
  1060000 0
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  1125000 0
  1130000 1
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  1235000 0
  1240000 22
  1245000 0
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  1325000 9
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  1970000 26
  1975000 4
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  1985000 9
  1990000 6
  1995000 1
  2000000 2
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  2035000 8
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  </code></pre>