mean

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I noticed that the numpy masked-array mean method returns different types when it probably should not: import numpy as np A = np.ma.masked_equal([1,1,0], value=0) B = np.ma.masked_equal([1,1,1], value=0) # no masked values type(A.mean()) #numpy.float64 type(B.mean()) #numpy.ma.core.MaskedArray Other numpy.ma.core.MaskedArray methods seem to be consistent type( A.sum()) == type(B.sum()) # True type( A.prod()) == type(B.prod()) # True type( A.std()) == type(B.std()) # True type( A.mean()) == type(B.mean()) # False Can someone explain this?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to calculate the trimmed mean , which excludes the outliers, of an array. I found there is a module called scipy.stats.tmean , but it requires the user specifies the range by absolute value instead of percentage values . In Matlab, we have m = trimmean(X,percent) , that does exactly what I want. Do we have the counterpart in Python? 回答1: At least for scipy v0.14.0, there is a dedicated (but undocumented?) function for this: from scipy import stats m = stats.trim_mean(X, 0.1) # Trim 10% at both ends which used stats.trimboth

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In a dictionary like this: Dictionary openWith = new Dictionary (); openWith.Add("txt", "notepad.exe"); openWith.Add("bmp", "paint.exe"); openWith.Add("dib", "paint.exe"); openWith.Add("rtf", "wordpad.exe"); Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); The output is: For Key = "rtf" value = wordpad.exe What does the {0} mean? 回答1: You are printing a formatted string. The {0} means to insert the first parameter following the format string; in this case the value associated with the key "rtf". For String.Format, which

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I get the following error when running make , and I have no idea what it means or what to do about it. Can anyone illuminate me or point me in the right direction? ( cd libdvdnav - git && patch - p1 ) I'm trying to cross compile VLC for win32 (using linux). 回答1: It is an error generated by patch . If you would open the .patch file, you'd see that it's organized in a bunch of segments, so-called "hunks". Every hunk identifies corresponding pieces of code (by line numbers) in the old and new version, the differences between those

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When I went through Laravel Document about Eloquent ORM topic part, I got a new term Mass Assignment . Document show How to do Mass Assignment and the fillable or guarded properties settings. But after went through that, I didn't have a clearly understand about Mass Assignment and how it works. In my past experience in CodeIgniter, I also didn't hear about this term. Does anyone have a simple explanation about that? 回答1: Mass assignment is when you send an array to the model creation, basically setting a bunch of fields on the model in a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to find mean and standard deviation of 1st, 2nd,... digits of several (Z) lists. For example, I have A_rank=[0.8,0.4,1.2,3.7,2.6,5.8] B_rank=[0.1,2.8,3.7,2.6,5,3.4] C_Rank=[1.2,3.4,0.5,0.1,2.5,6.1] # etc (up to Z_rank )... Now I want to take the mean and std of *_Rank[0] , the mean and std of *_Rank[1] , etc. (ie: mean and std of the 1st digit from all the (A..Z)_rank lists; the mean and std of the 2nd digit from all the (A..Z)_rank lists; the mean and std of the 3rd digit...; etc). 回答1: I would put A_Rank et al into a 2D NumPy array,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What does mean in void someMethod() ? what return type does such function have? 回答1: is not a return type, void is. in this case represents a type variable which is used in this method only. For example, if I write this: T getFirstValue(List list) { return list.get(0); } this means that if I give the list containing objects of some specific type, it will return an object of this exact type. For example, if I give it a List , I know that I'll get back a String . The compiler guesses that T is actually a String so the method will act as String

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a bunch of measurements over time and I want to plot them in R. Here is a sample of my data. I've got 6 measurements for each of 4 time points: values The scale of these data is arbitrary, and in fact I'm going to normalize it so that the average of t=0 is 1. norm So far so good. Using ggplot , I plot both the individual points, as well as a line that goes through the average at each time point: require (ggplot2) p However, now I want to apply a logarithmic scale, and this is where my trouble starts. When I do: q The line does NOT go

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to compile openssl but encountering an error. The CFLAGS in use are: -O2 -fPIC -fno-strict-overflow Can someone explain to me please what is .rodata and what the following sentence means? /usr/bin/ld: libcrypto.a(wp_block.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC libcrypto.a(wp_block.o): error adding symbols: Bad value I am unsure what is libcrypto.a but apparently it is part of openssl. How could this possibly be fixed? 回答1: /usr/bin/ld: libcrypto.a(wp_block.o

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am new to R and keep getting errors with the following message: unable to find an inherited method for function ‘A’ for signature ‘"B"’ In most cases I've been able to solve my issues by finding alternate examples online, but I'd like to understand what the error message means so I can better understand how R works. For example, this code: library ( "RSQLite" ) con = dbConnect ( drv = "SQLite" , dbname = "database.db" ) Generates this warning: unable to find an inherited method for function ‘dbConnect’ for signature ‘"character"’