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: In AOSP9.0.0_r30 's build log, there are clang commands like this: prebuilts/clang/host/linux-x86/clang-4691093/bin/clang++ /OpenSource/Build/Android/9.0.0_r30/soong/.intermediates/bionic/libc/crtbegin_so/android_x86_64_core/crtbegin_so.o @/OpenSource/Build/Android/9.0.0_r30/soong/.intermediates/bionic/libm/libm/android_x86_64_core_shared/libm.so.rsp ...... FYI, it is a linking commmand. In short, it is like: clang++ path_to_file1 @path_to_file2 ...... What does the " @ " mean here? 文章来源: What does @ mean in this clang command in AOSP build

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 do some calculation in nested lists The example is [['Amy',2,3,4],['Jack',3,4,None]] , and I want to see the output like: [[3.0,'Amy'],[3.5,'Jack']] (3.0 is mean of 2,3,4 and 3.5 is mean of 3,4) My code: def compute_mean_pc(): students_pclist=[['Amy',2,3,4],['Jack',3,4,None]] mean_pc=[[[countMean(students_pclist[element][1:])]for element in enumerate(students_pclist)]+[element[0]]for element in students_pclist] print(mean_pc) def countMean(array): count=0 sumup=0 for i in range(len(array)): if array[i]!=None: count+=1 sumup+

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: the google page speed addon informs me: The following publicly cacheable, compressible resources should have a "Vary: Accept-Encoding" header: //some .js and .css files I don't understand what this means. I've already compressed these files like so: if (encodings.Contains("gzip") || encodings == "*") { app.Response.Filter = new GZipStream(baseStream, CompressionMode.Compress); app.Response.AppendHeader("Content-Encoding", "gzip"); } And this all seems to work. Why is having Vary: Accept-Encoding necessary? 回答1: It is allowing the cache to

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'm trying to do an update, in MySQL 5.0, of the form: update mytable.myfield t set f = 'blah' where t.id in (select v.id from myview v where ...); MySQL tells me: ErrorNr. 1443 The definition of table 'v' prevents operation UPDATE on table 't'. The MySQL docs list this error, but (as usual) don't say what it means. Can anyone shed some light on this for me? I only reference the view in the subquery, and I only reference the table in the main query, and I don't know why these would prevent the update. The only thing I found with google is 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 put together a VAE using Dense Neural Networks in Keras. During model.fit I get a dimension mismatch, but not sure what is throwing the code off. Below is what my code looks like from keras.layers import Lambda, Input, Dense from keras.models import Model from keras.datasets import mnist from keras.losses import mse, binary_crossentropy from keras.utils import plot_model from keras import backend as K import keras import numpy as np import matplotlib.pyplot as plt import argparse import os (x_train, y_train), (x_test, y_test) = mnist.load

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: When estimating the mean with a vector of all NA's we get an NaN if na.rm = TRUE . Why is this, is this flawed logic or is there something I'm missing? Surely it would make more sense to use NA than NaN ? Quick example below mean ( NA , na . rm = TRUE ) #[1] NaN mean ( rep ( NA , 10 ), na . rm = TRUE ) #[1] NaN 回答1: It is a bit pity that ?mean does not say anything about this. My comment only told you that applying mean on an empty "numeric" results in NaN without more reasoning. Rui Barradas's comment tried to reason this but was

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 running median, mean and std of a large array. I know how to calculate the running mean as below: def running_mean(x, N): cumsum = np.cumsum(np.insert(x, 0, 0)) return (cumsum[N:] - cumsum[:-N]) / float(N) This works very efficiently. But I do not quite understand why (cumsum[N:] - cumsum[:-N]) / float(N) can give the mean value (I borrowed from someome else). I tried to add another return sentence to calculate the median, but it does not do what I want. return (cumsum[N:] - cumsum[:-N]) / float(N), np.median

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'm trying to link a UILabel with an IBOutlet created in my class. My application is crashing with the following error. What does this mean? How can I fix it? *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key XXX.' 回答1: Your view controller may have the wrong class in your xib. I downloaded your project. The error you are getting is 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value

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: Looking to get the fundamentals on where the term VOID comes from and why it would be called void. The intention of the question is to assist someone who has no C experience and is suddenly looking at a C-based codebase. 回答1: Basically it means "nothing" or "no type" There are 3 basic ways that void is used: Function argument: int myFunc(void) -- the function takes nothing. Function return value: void myFunc(int) -- the function returns nothing Generic data pointer: void* data -- 'data' is a pointer to data of unknown type, and cannot be

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've seen some examples when constructing a heatmap of having the fill variable set to ..level.. . Such as in this example: library(MASS) ggplot(geyser, aes(x = duration, y = waiting)) + geom_point() + geom_density2d() + stat_density2d(aes(fill = ..level..), geom = "polygon") I suspect that the ..level.. means that the fill is set to the relative amount of layers present? Also could someone link me a good example of how to interpret these 2D-density plots, what does each contour represent etc.? I have searched online but couldn't find any