绘制直方图 [英] Plotting histograms
问题描述
我有一些存储在矢量中的值（比如-a到a），我想要
来绘制这些值的直方图。我怎样才能在python中完成它。
我已经安装并导入了Matplotlib软件包但执行了
代码
[N，x ] = hist（eig，10）#make a histogram
我收到错误提示NameError：name''hist''不是
defined"。
有没有其他方法可以在给定范围内绘制直方图？
谢谢
Amit
am*********** @ gmail.com 写道：
我有一些值（比如-a到a）存储在矢量中，我想要
来绘制这些值的直方图。我怎样才能在python中完成它。
我已经安装并导入了Matplotlib软件包但执行了
代码
[N，x ] = hist（eig，10）#make a histogram
我收到一条错误，上面写着NameError：name''hist''不是
defined。
我假设你做的是这样的：
来自matplotlib import pylab
[N，x] = hist（eig，10）
你真正想要的是：
来自matplotlib import pylab
[N，x] = pylab.hist（eig，10）
或者，如果您处于交互式提示符（但请记住，不建议使用
在模块中这样做）：
来自matplotlib.pylab的
导入*
[N，x] = hist（eig， 10）
如果您不了解差异，您可能想要查看导入
模块的教程部分。
-
Robert Kern
我开始相信整个世界都是一个谜，一个无害的谜
由于我们疯狂地试图解释它而变得可怕，好像它有一个潜在的真相。
- Umberto Eco
< am *********** @ gmail.comwrote：
hi，我有一些存储在向量中的值（比如-a到a），我想要
来绘制这些值的直方图。我怎样才能在python中完成它。
我已经安装并导入了Matplotlib软件包但执行了
代码
[N，x ] = hist（eig，10）#make a histogram
我收到一条错误，上面写着NameError：name''hist''不是
defined。
在程序开头使用来自pylab import *的语句。
其他当然，可能会发现它更有品味和Pythonic：
[N，x] = pylab.hist（eig，10）
ie ，使用包名称作为前缀。毕竟，不想让程序的
全局命名空间混乱。
祝你好运。我想我看到了高级线性
代数与''eig''（Eigen-？）的参考，我相信你明白比我更好
。 :)
- Theerasak
文章< ma ************* *****************************@python.o rg>，
Robert Kern< ro ***** **** @ gmail.com写道：
我假设你做的是这样的：
来自matplotlib import的
pylab
[N，x] = hist（eig，10）
你真正想要的是：
$ b来自matplotlib的$ b导入pylab
[N，x] = pylab.hist（eig，10）
或者，如果你在交互式提示（但请记住，这是不可取的
到
在模块中这样做）：
来自matplotlib.pylab import *
[N，x] = hist（eig，10）
您可能希望查看有关导入的教程部分<如果您不理解这些差异，请使用
模块。
pylab是matplotlib的一部分吗？我一直认为这是另一种方式
左右。作为scipy的一部分，我对numpy有类似的看法。也许我是
对依赖项感到困惑。我发现在实例中有些令人困惑
有时当更大时包是导入的（例如scipy）然后是
"子包"也是进口的。像这样：
来自scipi import *
来自scipi import numpy
我知道我见过这样的东西，但我不明白。依赖关系
让我感到困惑。
我搜索了导入教程，但没有找到答案。< br $>
- Lou Pecora（我的观点是我自己的）删除它给我发电子邮件。
hi, I have some values(say from -a to a) stored in a vector and I want
to plot a histogram for those values. How can I get it done in python.
I have installed and imported the Matplotlib package but on executing
the code
[N,x]=hist(eig, 10) # make a histogram
I am getting an error saying "NameError: name ''hist'' is not
defined".
Is there any other way to plot histograms over a given range?
thanks
Amit
am***********@gmail.com wrote:hi, I have some values(say from -a to a) stored in a vector and I want
to plot a histogram for those values. How can I get it done in python.
I have installed and imported the Matplotlib package but on executing
the code
[N,x]=hist(eig, 10) # make a histogram
I am getting an error saying "NameError: name ''hist'' is not
defined".I presume what you did was something like this:
from matplotlib import pylab
[N,x] = hist(eig, 10)
What you actually want is this:
from matplotlib import pylab
[N,x] = pylab.hist(eig, 10)
Or, if you''re at the interactive prompt (but remember that it is inadvisable to
do so in modules):
from matplotlib.pylab import *
[N,x] = hist(eig, 10)
You will probably want to review the section of the tutorial on importing
modules if you don''t understand the differences.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
On 16 Oct 2006 20:49:10 -0700, am***********@gmail.com
<am***********@gmail.comwrote:hi, I have some values(say from -a to a) stored in a vector and I want
to plot a histogram for those values. How can I get it done in python.
I have installed and imported the Matplotlib package but on executing
the code
[N,x]=hist(eig, 10) # make a histogram
I am getting an error saying "NameError: name ''hist'' is not
defined".Use the statement ''from pylab import *'' in the beginning of your program.
Others, of course, may find it more tasteful and Pythonic to do:
[N,x]=pylab.hist(eig, 10)
i.e., prefix it with the package name. Wouldn''t want to clutter the
global namespace of your program after all.
Good luck with it then. I think I see a reference to advanced linear
algebra with ''eig'' (Eigen-?) and I''m sure you understand that better
than I. :)
-- Theerasak
In article <ma**************************************@python.o rg>,
Robert Kern <ro*********@gmail.comwrote:
I presume what you did was something like this:
from matplotlib import pylab
[N,x] = hist(eig, 10)
What you actually want is this:
from matplotlib import pylab
[N,x] = pylab.hist(eig, 10)
Or, if you''re at the interactive prompt (but remember that it is inadvisable
to
do so in modules):
from matplotlib.pylab import *
[N,x] = hist(eig, 10)
You will probably want to review the section of the tutorial on importing
modules if you don''t understand the differences.
Is pylab part of matplotlib? I always thought it was the other way
around. I have a similar view of numpy as part of scipy. Maybe I''m
confused on the dependencies. I find it confusing in the examples
sometimes when the "bigger" package is imported (e.g. scipy) and then a
"subpackage" is also imported. Like this:
from scipi import *
from scipi import numpy
I know I''ve seen stuff like that, but I don''t get it. The dependencies
are confusing to me.
I did a search of the tutorial on ''import'' but didn''t find the answer.
-- Lou Pecora (my views are my own) REMOVE THIS to email me.
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