为什么它们会被连接在一起？这些值是不同的。

huangapple
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英文:

Why are they getting joined? The values are different

问题

  1. X <- c('1.07', '2.14', '3.22', '4.29')
  2. Y <- c(0.298, 0.272, 0.271, 0.270)
  3. Y1 <- c(0.274, 0.269, 0.255, 0.249)
  5. par(mar = c(0.1, 0.1, 0.1, 0.1) + 2)
  7. plot(X, Y, xlab= "VG高度（毫米）", ylab= "阻力系数（Cd）",
  8.       main = "VG高度 vs. 阻力系数", type= "o", pch = 20,
  9.       lwd = 2, col = "red")
  11. par(new = TRUE)
  13. plot(X, Y1, xlab= "", ylab= "", main = "", axes = FALSE, type= "o",
  14.     pch = 20, lwd = 2, col = "blue")

我尝试生成两个Y轴。但是，两条线都连接在一起，尽管它们具有不同的值。

英文: 
  1. X &lt;- c(&#39;1.07&#39;, &#39;2.14&#39;, &#39;3.22&#39;, &#39;4.29&#39;)
  2. Y &lt;- c(0.298, 0.272, 0.271, 0.270)
  3. Y1 &lt;- c(0.274, 0.269, 0.255, 0.249)
  5. par(mar = c(0.1, 0.1, 0.1, 0.1) + 2)   
  7. plot(X, Y, xlab= &quot;Height of the VG (in mm)&quot;, ylab= &quot;Drag Co-efficient (Cd)&quot;, 
  8.       main = &quot;Height of the VG vs. Drag Co-efficient&quot;, type= &quot;o&quot;, pch = 20, 
  9.       lwd = 2, col = &quot;red&quot;)
  11. par(new = TRUE) 
  13. plot(X, Y1, xlab= &quot;&quot;, ylab= &quot;&quot;, main = &quot;&quot;, axes = FALSE, type= &quot;o&quot;, 
  14.     pch = 20, lwd = 2, col = &quot;blue&quot;)

I'm trying to generate two y axes. But, both the lines are getting joined, even though with different value.

答案1

得分: 1

问题出在y轴限制上，图表未使用相同的数值。首先创建一个名为 ylim 的向量，其中包含 Y 和 Y1 的常用值，然后在图表中使用它。

  1. X &lt;- c('1.07', '2.14', '3.22', '4.29')
  2. Y &lt;- c(0.298, 0.272, 0.271, 0.270)
  3. Y1 &lt;- c(0.274, 0.269, 0.255, 0.249)
  5. # 保存默认值
  6. old_par &lt;- par(mar = c(0.1, 0.1, 0.1, 0.1) + 2)
  8. # 定义y轴限制
  9. ylim &lt;- range(c(Y, Y1))
  11. plot(
  12.   X, Y, 
  13.   # 设置y轴限制
  14.   ylim = ylim,
  15.   xlab = "VG的高度（毫米）", 
  16.   ylab = "阻力系数（Cd）", 
  17.   main = "VG高度与阻力系数", 
  18.   type = "o", 
  19.   pch = 20, 
  20.   lwd = 2, 
  21.   col = "red"
  22. )
  24. par(new = TRUE)
  26. plot(
  27.   X, Y1,
  28.   # 设置y轴限制为
  29.   # 与上述相同的值
  30.   ylim = ylim,
  31.   xlab = "", 
  32.   ylab = "", 
  33.   main = "", 
  34.   axes = FALSE, 
  35.   type = "o", 
  36.   pch = 20, 
  37.   lwd = 2, 
  38.   col = "blue"
  39. )
英文:

The problem is in the y axis limits, the plots are not using the same values. Below I first create a vector ylim with values common to Y and Y1, then use it in the plots.

  1. X &lt;- c(&#39;1.07&#39;, &#39;2.14&#39;, &#39;3.22&#39;, &#39;4.29&#39;)
  2. Y &lt;- c(0.298,0.272,0.271,0.270)
  3. Y1 &lt;- c(0.274,0.269,0.255,0.249)
  5. # save the default values
  6. old_par &lt;- par(mar = c(0.1, 0.1, 0.1, 0.1) + 2)   
  8. # define the y axis limits
  9. ylim &lt;- range(c(Y, Y1))
  11. plot(
  12.   X, Y, 
  13.   # set the y axis limits
  14.   ylim = ylim,
  15.   xlab = &quot;Height of the VG (in mm)&quot;, 
  16.   ylab= &quot;Drag Co-efficient (Cd)&quot;, 
  17.   main = &quot;Height of the VG vs. Drag Co-efficient&quot;,
  18.   type= &quot;o&quot;,
  19.   pch = 20, 
  20.   lwd = 2, 
  21.   col = &quot;red&quot;
  22. )
  24. par(new = TRUE) 
  26. plot(
  27.   X, Y1,
  28.   # set the y axis limits to the
  29.   # same value as above
  30.   ylim = ylim,
  31.   xlab= &quot;&quot;, 
  32.   ylab= &quot;&quot;, 
  33.   main = &quot;&quot;, 
  34.   axes = FALSE, 
  35.   type = &quot;o&quot;, pch = 20, 
  36.   lwd = 2, 
  37.   col = &quot;blue&quot;
  38. )

为什么它们会被连接在一起？这些值是不同的。<!-- -->

  2. # restore default values
  3. par(old_par)

<sup>Created on 2023-06-12 with reprex v2.0.2</sup>

huangapple
  • 本文由 发表于 2023年6月13日 03:20:21
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