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- A kind of interesting discrete random variable is introduced, its mathematical expectation and variance are equal to 1, and further we obtain some summation formulas. 摘要介绍了一类有趣的离散型随机变量,它的均值和方差都是1,并由此得到了几个求和公式。
- On the basis of building the ship radiated-noise model, the mathematical expectation expressions of ship radiated-noise demodulation spectrum harmonic clan feature were educed. 在建立舰船辐射噪声仿真模型的基础上,推导了单、双螺旋桨舰船辐射噪声调制谱谐波族幅值特征的数学期望表达式。
- Markov chain monte carlo simulation (MCMC) was taken to sample the posterior distribution to get the marginal posterior probability function of the parameters, and the statistical quantities such as the mathematic expectation were calculated. 通过马尔科夫链蒙特卡罗模拟对后验分布进行了采样,获得了参数的后验边缘概率密度,并在此基础上获得了参数的数学期望等统计量。
- The change of coal thickness caused by geological structure is nonlinear and revulsion, but in a certain range, the mathematical expectation of coal thickness distribution is a fixed value. 由构造引起的煤厚变化具有非线性特征和突变性,但在一定的范围内,煤厚分布的数学期望为一个固定值。
- His new book did not come up to expectation. 他的新作没有达到预期水平。
- He is reputedly brilliant at mathematics. 据说他在数学方面很有才能。
- The dog wags its tail in expectation of a bone. 那条狗摇著尾巴,巴望吃肉骨头。
- It is a complexity of higher mathematics. 这是一道高等数学的难题。
- The elemental mathematics is very easy. 初等数学很简单。
- He did it in expectation of nothing. 他做这件事并不期望得到什么。
- Mathematics arose from the need of men. 数学是由于人们的需要而产生的。
- His mind was throbbing with expectation. 他的心因期待而柁柁地跳着。
- I'll have to rub up my mathematics. 我得把数学复习一下。
- I'm afraid I'm quite hopeless at mathematics. 我担心我的数学怎么也学不好。
- The shop expect to make a small profit this year. 这家店铺期望今年能赚点钱。
- I found then in tears contrary to my expectation. 我出乎意料地发现他们在哭。
- He is superior to his brother in mathematics. 他的数学比他兄弟好。
- He taught mathematics for many years. 他教数学已很多年了。
- She surpassed her brother in mathematics. 她在数学方面超过了她的兄弟。
- How in the world do you expect me to know him? 你究竟怎么会想到我认识他呢?