blocks|key|2720382|text|你得到这个错误是因为你的一个变量实际上是一个因子变量。执行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2720383|str(df)+|code-block|syntax|javascript|2720384|来检查这个。然后执行此双变量更改，以保留年份编号，而不是转换为"1,2,3,4“级别编号：|2720385|df$year+<-+as.numeric(as.character(df$year))|2720386|编辑:看起来你的data.frame有一个“数组”类的变量，这可能会导致pb。然后尝试：|2720387|df+<-+data.frame(apply(df,+2,+unclass))|2720388|然后再策划一次吗？|2720389|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

You get this error because one of your variables is actually a factor variable
. Execute

<pre><code>str(df) 
</code></pre>

to check this.
Then do this double variable change to keep the year numbers instead of transforming into "1,2,3,4" level numbers:

<pre><code>df$year &lt;- as.numeric(as.character(df$year))
</code></pre>

EDIT: it appears that your data.frame has a variable of class "array" which might cause the pb.
Try then:

<pre><code>df &lt;- data.frame(apply(df, 2, unclass))
</code></pre>

and plot again?

blocks|key|146393|text|在一个新的会话中启动R，并将其粘贴到：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|146394|library(ggplot2)

df+<-+structure(list(year+=+c(1,+2,+3,+4),+pollution+=+structure(c(346.82,+
134.308821199349,+130.430379885892,+88.275457392443),+.Dim+=+4L,+.Dimnames+=+list(
++++c("1999",+"2002",+"2005",+"2008")))),+.Names+=+c("year",+
"pollution"),+row.names+=+c(NA,+-4L),+class+=+"data.frame")

df[]+<-+lapply(df,+as.numeric)+#+make+all+columns+numeric

ggplot(df,+aes(year,+pollution))+%2B
+++++++++++geom_point()+%2B
+++++++++++geom_line()+%2B
+++++++++++labs(x+=+"Year",+
++++++++++++++++y+=+"Particulate+matter+emissions+(tons)",+
++++++++++++++++title+=+"Motor+vehicle+emissions+in+Baltimore")|code-block|syntax|javascript|146395|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Start up R in a fresh session and paste this in:

<pre><code>library(ggplot2)

df &lt;- structure(list(year = c(1, 2, 3, 4), pollution = structure(c(346.82, 
134.308821199349, 130.430379885892, 88.275457392443), .Dim = 4L, .Dimnames = list(
 c("1999", "2002", "2005", "2008")))), .Names = c("year", 
"pollution"), row.names = c(NA, -4L), class = "data.frame")

df[] &lt;- lapply(df, as.numeric) # make all columns numeric

ggplot(df, aes(year, pollution)) +
 geom_point() +
 geom_line() +
 labs(x = "Year", 
 y = "Particulate matter emissions (tons)", 
 title = "Motor vehicle emissions in Baltimore")
</code></pre>

blocks|key|145060|text|您只需将group+=+1添加到ggplot或geom_line+aes()中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|145061|145062|对于折线图，必须对数据点进行分组，以便它知道要连接哪些点。在这种情况下，很简单--所有的点都应该连接在一起，所以group=1。当使用更多的变量并绘制多条线时，线的分组通常是通过变量来完成的。|blockquote|145063|145064|145065|参考：Cookbook+for+R,+Chapter:+Graphs+Bar_and_line_graphs_(ggplot2),+Line+graphs.|145066|试试这个：|145067|plot5+<-+ggplot(df,+aes(year,+pollution,+group+=+1))+%2B
+++++++++geom_point()+%2B
+++++++++geom_line()+%2B
+++++++++labs(x+=+"Year",+y+=+"Particulate+matter+emissions+(tons)",+
++++++++++++++title+=+"Motor+vehicle+emissions+in+Baltimore")|code-block|syntax|javascript|145068|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cookbook-r.com/Graphs/Bar_and_line_graphs_(ggplot2)/^0|4|9|0|0|0|0|0|3|23|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|16|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|18|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|N|3|O|5|6|7|1D|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1E|8|@]|D|@]|E|$S|T]]|$1|U|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

You only have to add <code>group = 1</code> into the ggplot or geom_line aes().

<blockquote>
 For line graphs, the data points must be grouped so that it knows which points to connect. In this case, it is simple -- all points should be connected, so group=1. When more variables are used and multiple lines are drawn, the grouping for lines is usually done by variable.
</blockquote>

Reference: <a href="http://www.cookbook-r.com/Graphs/Bar_and_line_graphs_(ggplot2)/" rel="noreferrer">Cookbook for R, Chapter: Graphs Bar_and_line_graphs_(ggplot2), Line graphs.</a>

Try this:

<pre><code>plot5 &lt;- ggplot(df, aes(year, pollution, group = 1)) +
 geom_point() +
 geom_line() +
 labs(x = "Year", y = "Particulate matter emissions (tons)", 
 title = "Motor vehicle emissions in Baltimore")
</code></pre>

blocks|key|142817|text|我在数据框架上也遇到了类似的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|142818|group+time+weight.loss
1+Control++wl1++++4.500000
2++++Diet++wl1++++5.333333
3++DietEx++wl1++++6.200000
4+Control++wl2++++3.333333
5++++Diet++wl2++++3.916667
6++DietEx++wl2++++6.100000
7+Control++wl3++++2.083333
8++++Diet++wl3++++2.250000
9++DietEx++wl3++++2.200000|code-block|syntax|javascript|142819|我认为x轴的变量应该是数字的，这样geom_line就知道如何连接点来绘制直线。|142820|在我将第二列更改为数字后：|142821|+group+time+weight.loss
1+Control++++1++++4.500000
2++++Diet++++1++++5.333333
3++DietEx++++1++++6.200000
4+Control++++2++++3.333333
5++++Diet++++2++++3.916667
6++DietEx++++2++++6.100000
7+Control++++3++++2.083333
8++++Diet++++3++++2.250000
9++DietEx++++3++++2.200000|142822|然后它就起作用了。|142823|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I had similar problem with the data frame:

<pre><code>group time weight.loss
1 Control wl1 4.500000
2 Diet wl1 5.333333
3 DietEx wl1 6.200000
4 Control wl2 3.333333
5 Diet wl2 3.916667
6 DietEx wl2 6.100000
7 Control wl3 2.083333
8 Diet wl3 2.250000
9 DietEx wl3 2.200000
</code></pre>

I think the variable for x axis should be numeric, so that geom_line knows how to connect the points to draw the line.

after I change the 2nd column to numeric:

<pre><code> group time weight.loss
1 Control 1 4.500000
2 Diet 1 5.333333
3 DietEx 1 6.200000
4 Control 2 3.333333
5 Diet 2 3.916667
6 DietEx 2 6.100000
7 Control 3 2.083333
8 Diet 3 2.250000
9 DietEx 3 2.200000
</code></pre>

then it works.

blocks|key|2720494|text|我得到了类似的提示。这是因为我以某个百分比指定了x轴(例如:+10%25A，20%25B，...)。因此，另一种方法是将这些值相乘，然后以最简单的形式编写它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2720495|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got a similar prompt. It was because I had specified the x-axis in terms of some percentage (for example: 10%A, 20%B,....).
So an alternate approach could be that you multiply these values and write them in the simplest form.

blocks|key|145113|text|我发现，如果绘制的大多数数据都在轴限制之外，也会发生这种情况。在这种情况下，请相应地调整轴比例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|145114|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I found this can also occur if the most of the data plotted is outside of the axis limits. In that case, adjust the axis scales accordingly.

With this data frame ("df"):

<pre><code>year pollution
1 1999 346.82000
2 2002 134.30882
3 2005 130.43038
4 2008 88.27546
</code></pre>

I try to create a line chart like this:

<pre><code> plot5 &lt;- ggplot(df, aes(year, pollution)) +
 geom_point() +
 geom_line() +
 labs(x = "Year", y = "Particulate matter emissions (tons)", title = "Motor vehicle emissions in Baltimore")
</code></pre>

The error I get is:

<blockquote>
 geom_path: Each group consist of only one observation. Do you need to
 adjust the group aesthetic?
</blockquote>

The chart appears as a scatter plot even though I want a line chart. I tried to replace <code>geom_line()</code> with <code>geom_line(aes(group = year))</code> but that didn't work. 

In an answer I was told to convert year to a factor variable. I did and the problem persists. This is the output of <code>str(df)</code> and <code>dput(df)</code>:

<pre><code>'data.frame': 4 obs. of 2 variables:
 $ year : num 1 2 3 4
 $ pollution: num [1:4(1d)] 346.8 134.3 130.4 88.3
 ..- attr(*, "dimnames")=List of 1
 .. ..$ : chr "1999" "2002" "2005" "2008"

structure(list(year = c(1, 2, 3, 4), pollution = structure(c(346.82, 
134.308821199349, 130.430379885892, 88.275457392443), .Dim = 4L, .Dimnames = list(
 c("1999", "2002", "2005", "2008")))), .Names = c("year", 
"pollution"), row.names = c(NA, -4L), class = "data.frame")
</code></pre>

ggplot2 line chart gives "geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?"

使用此数据帧("df")：year pollution1 1999 346.820002 2002 134.308823 2005 130.430384 2008 88.27546我试着创建一个这样的折线图： plot5 <- ggplot(df, aes(year, pollution)) + ...

问ggplot2折线图给出了"geom_path:每个组只有一个观察点。你需要调整组的美学吗？“
EN

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问ggplot2折线图给出了"geom_path:每个组只有一个观察点。你需要调整组的美学吗？“
EN