我试图运行一个单元测试,模拟一个子类,SQLiteOpenHelper但我收到以下错误.
java.lang.NoClassDefFoundError: android/database/sqlite/SQLiteOpenHelper
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
...
at org.dfhu.vpodplayer.util.JsonExporterTest.export(JsonExporterTest.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
...
我的Gradle文件看起来像
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion '25.0.1'
defaultConfig {
applicationId "org.dfhu.vpodplayer"
minSdkVersion 18
targetSdkVersion 24
versionCode 1
versionName "1.2"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
compileOptions {
targetCompatibility 1.7
sourceCompatibility 1.7
}
}
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
} …我正在尝试运行特定版本的couchdbon travis-ci我这样做是通过遵循官方的apt-get指示couchdb
部分安装是提示如何处理旧配置文件.请参阅以下内容:
Installing new version of config file /etc/logrotate.d/couchdb ...
Configuration file `/etc/couchdb/local.ini'
==> Deleted (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell …我正在实现sin三角函数的CORDIC算法.为了做到这一点,我需要硬编码/计算一堆反正切值.现在我的功能似乎可以工作(由Wolfram Alpha验证)到打印的精度,但我希望能够打印我的所有32位精度f32.我该怎么办？
fn generate_table() {
let pi: f32 = 3.1415926536897932384626;
let k1: f32 = 0.6072529350088812561694; // 1/k
let num_bits: uint = 32;
let num_elms: uint = num_bits;
let mul: uint = 1 << (num_bits - 2);
println!("Cordic sin in rust");
println!("num bits {}", num_bits);
println!("pi is {}", pi);
println!("k1 is {}", k1);
let shift: f32 = 2.0;
for ii in range(0, num_bits) {
let ipow: f32 = 1.0 / shift.powi(ii as i32);
let cur: …一旦我确定使用我的数据集离群无论是One-class SVM或Elliptic Envelope,我该如何使用这些模型从数据集中去除异常值？
这是我正在看的例子.
我看到
let s = String::from_str("hello");
let bytes = s.into_bytes();
assert_eq!(bytes, vec![104, 101, 108, 108, 111]);
但我想做的是
assert_eq!(s.something(), b"hello");
哪里.something()只是一个占位符,它可能是something(s)或类似的.
我这样做,所以我可以使用字符串
fn foo(mut stream: BufferedStream<TcpStream>, str: String) {
stream.write(str.something());
}
我试图获得pi/2我在官方文档和代码1中可以看到的"std"值.
我尝试了下面的变化,但没有运气
let p2: f64 = std::f64::FRAC_PI_2; // fixme
let p2: f64 = std::f64::frac_pi_2(); // fixme
let tmp: f64 = 1.0; // tmp variable
let p2: f64 = tmp.frac_pi_2(); // fixme
let p2: f64 = 3.1415926536897932384626/2.0; // what my current code does now
我认为有一些关于如何使用consts文字和std库的基本内容我并不是很吵.
PS
这是我第一次尝试实施cordic方法的生锈程序的一部分,因为我在SO上的最后几个问题,代码位于此处.
我在saucelabs example.py文件中找到了使用该import new模块的以下代码片段.
import new
# .. snip ..
def on_platforms(platforms):
def decorator(base_class):
module = sys.modules[base_class.__module__].__dict__
for i, platform in enumerate(platforms):
d = dict(base_class.__dict__)
d['desired_capabilities'] = platform
name = "%s_%s" % (base_class.__name__, i + 1)
module[name] = new.classobj(name, (base_class,), d)
return decorator
但阅读help(new)显示该模块已弃用.什么是非折旧方式new.classobj(name, (base_class,), d)