runtime-error | 易学教程

Numpy error: invalid value encountered in power

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问题 I have the following code: import numpy def numpysum(n): a = numpy.arange(n) ** 2 b = numpy.arange(n) ** 3 c = a + b return c size = 3000 c = numpysum(size) When running, I get the error: D:\Work\programming\python\test_1\src\test1_numpy.py:6: RuntimeWarning: invalid value encountered in power b = numpy.arange(n) ** 3 Note that the following numpyless function works fine: def pythonsum(n): a = list(range(n)) b = list(range(n)) c = [] for i in range(len(a)): a[i] = i ** 2 b[i] = i ** 3 c

W/CameraBase﹕ An error occurred while connecting to camera: 0

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问题 There was a similar question but it went unresolved: W/CameraBase﹕ An error occurred while connecting to camera: 0 on camera.open() call I have an app which (naturally) is using the camera. Its been working fine. However with no code changes, between builds, the app started crashing (verified no code changes via Git commit history). To further verify the issue is somewhere in the hardware, I ran the same code on another phone and it works just fine. Somehow the camera is locked and won't open

Android - Could not find google-play-services_lib.apk! error

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问题 I am trying to use the new Google Play Services for Google Plus integration from this link: http://ankitthakkar90.blogspot.sg/2013/05/google-plus-integration-in-android.html I was able to get everything right except when i try to run it, it provide me with this error Android Launch! adb is running normally. Performing com.anky.googleplus.MainActivity activity launch Automatic Target Mode: using device 'CB5A1MQW4P' Uploading GooglePlusDemo.apk onto device 'CB5A1MQW4P' Installing GooglePlusDemo

PostgreSQL cannot begin/end transactions in PL/pgSQL

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问题 I am seeking clarification of how to ensure an atomic transaction in a plpgsql function, and where the isolation level is set for this particular change to the database. In the plpgsql function shown below, I want to make sure that BOTH the deletion AND the insertion succeed. I am getting an error when I try to wrap them in a single transaction: ERROR: cannot begin/end transactions in PL/pgSQL . What happens during execution of the function below if another user has added a default behavior

Recursion in Python? RuntimeError: maximum recursion depth exceeded while calling a Python object [duplicate]

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问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Maximum recursion depth? I have another problem with my code. I'm wrtiting my first program in Vpython and I have to make a simulation of mixing two gases. First i had a problem with borders, but now when the balls(that represents the gas particles) stay within the borders there is sth different wrong. After a few seconds i get an error, which is shown below the source code of my function. Code: def

OpenCV 2.1: Runtime error

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I have a program which uses OpenCV. I have a webcam and it captures color frames and I want to convert the color frames to gray-scale frames. So, I used the cvCvtColor(color_frame, gray_frame, CV_BGR2GRAY); to convert the color frames to BW frames. Upon using this color->Grayscale conversion function, I get a runtime error as: OpenCV Error: Null pointer (NULL array pointer is passed) in unknown function, file ..\..\..\..\ocv\opencv\src\cxcore\cxarray.cpp, line 2376 Anyone experienced this problem before? Any solutions how to fix this? Thanks My Program #include<stdio.h> #include<stdlib.h>

No Main class found in NetBeans

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问题 I have been working on an assignment for my class in programming. I am working with NetBeans. I finished my project and it worked fine. I am getting a message that says "No main class found" when I try to run it. Here is some of the code with the main: package luisrp3; import java.io.FileNotFoundException; import java.io.PrintStream; public class LuisRp3 { public static void main(String[] args) throws FileNotFoundException { java.io.File newFile = new java.io.File("LuisRamosp4.txt"); if

“IOError: [Errno 0] Error” error in Python

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I have a script that should append something to a file, but it is raising an error that I don't understand and not sure how it is being triggered. Here is the code: import re num_words = "four kiddiewinks|four children|four kids" words_list = num_words.split('|') def append_2synonym(words_list, num_words): with open('test2 words.txt', 'a+') as f: read_f = f.read() patt = r'^' + words_list[0] + '\|' result = re.search(patt, read_f, re.MULTILINE) if result == None: f.write("\n" + num_words) else: print "\nNo match found in '2 words.txt' file" append_2synonym(words_list, num_words) Here is the

What is the difference between Swift 2.0 do-try-catch and regular Java/C#/C++ exceptions

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问题 It seems that Swift 2.0 has changed from traditional ObjC (NSError returning) and Swift 1.X (Success/Failure optionals) conventions of runtime error handling, to something that looks very similar to exception handling in languages like Java/C#/C++/etc. Apple has traditionally emphasized use of NSError instead of throwing NSException for runtime errors (vs programmer errors), as NSException stack unwinding could cause memory leaks with default ObjC compiler settings. Now they have however

It says that TypeError: document.getElementById(…) is null

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问题 Althought I pushed a parameter to getElementById I wonder from where is this 'is null' error coming from? TypeError: document.getElementById(...) is null [Break On This Error] document.getElementById(elmId).innerHTML = value; Line 75 In addition to this i wonder why title and time did not show unless I click one of these playlist pictures? 回答1: All these results in null : document.getElementById('volume'); document.getElementById('bytesLoaded'); document.getElementById('startBytes'); document