Question

以DataFrame格式使用Google价格的简单示例。 Gadfly图给出了以下错误：TypeError(u'There is no Line2D property "y"',)。也出于某种原因引用了matplotlib。

此处的代码：

using Quandl
using DataFrames

google = quandl("GOOG/NASDAQ_QQQ", format = "DataFrame")

date = google[1]

dt_str = Array(Any,length(date))
for i=1:length(date)
dt_str[i] = string(date[i]);
end

price = google[5]

using Gadfly

set_default_plot_size(20cm, 10cm)

p1 = plot(x=dt_str, y=price,
Geom.point, 
Geom.smooth(method=:lm),
Guide.xticks(ticks=[1:25]),
Guide.yticks(ticks=[1:25]),
Guide.xlabel("Date"), 
Guide.ylabel("Price"),
Guide.title("Google: Close Price"))

LoadError: PyError (:PyObject_Call) 
TypeError(u'There is no Line2D property "y"',)
  File "C:\Anaconda2\lib\site-packages\matplotlib\pyplot.py", line 3154, in plot
    ret = ax.plot(*args, **kwargs)
  File "C:\Anaconda2\lib\site-packages\matplotlib\__init__.py", line 1811, in inner
    return func(ax, *args, **kwargs)
  File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_axes.py", line 1424, in plot
    for line in self._get_lines(*args, **kwargs):
  File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 395, in _grab_next_args
    for seg in self._plot_args(remaining[:isplit], kwargs):
  File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 374, in _plot_args
    seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
  File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 281, in _makeline
    self.set_lineprops(seg, **kwargs)
  File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 189, in set_lineprops
    line.set(**kwargs)
  File "C:\Anaconda2\lib\site-packages\matplotlib\artist.py", line 936, in set
    (self.__class__.__name__, k))

while loading In[64], in expression starting on line 1

 in getindex at C:\Users\yburkitbayev\.julia\v0.4\PyCall\src\PyCall.jl:239

Answer 1

PyError的存在意味着我执行此示例的会话在加载Gadfly之前加载了PyPlot。 PyPlot和Gadfly都导出绘图函数，因此在加载了PyPlot和Gadfly的会话中使用plot需要使用包名称来限定函数名称（例如PyPlot.plot或Gadfly.plot）。

在尚未加载PyPlot的会话中执行您的示例，但加载了Gadfly，会生成一个Gadfly图，而不显示帖子中提供的错误消息。

在康达上运行IJulia。试图绘制Quandl数据

1 个答案: