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MathWorks Application Support Engineer - EE Control电话面经

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zach 发表于 2015-4-14 23:43:17 | 显示全部楼层 |阅读模式
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2015(1-3月) 工程类 博士 全职@Zillow - 内推 - HR筛选 技术电面  | Pass | fresh grad应届毕业生

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总共两轮电面,第一轮HR,第二轮技术。拿到onsite了以后因为各种原因实在不想搬家到麻省,就withdraw了。. 一亩-三分-地,独家发布
Glassdoor上这个职位的面经一大把,而且重合度很高,说明不怎么换题……

我申的是EE-control方向,准备的时候基本就是去glassdoor把题目分类整理一下然后一个个准备。所以下面列的问题,不是我被问到的,而是我从glassdoor上搜集来的。实际被问到的问题我能想起来的都加粗了。下面详细说:

第一轮HR就是问些behaviour questions,why mathworks啊,describe a challenge啊之类的。. 围观我们@1point 3 acres
. more info on 1point3acres
第二轮技术面,问题分以下几类,有的题目我在括号里写了简短的答案:
1. 数学 - 微积分、微分方程、线性代数之类的
- Find eigenvalues and eigenvectors of a 2x2 matrix (列出eigenvector定义然后解二元一次方程组)
- Find the maximum area of a rectangle under a curve (写出面积表达式然后求导求二次导)
- Rank of matrix (the size of the largest collection of linearly independent columns of A (the column rank) or the size of the largest collection of linearly independent rows of A (the row rank). For every matrix, the column rank is equal to the row rank)
-Eigenvalues of a matrix
-Eigenvector of a matrix
-Inverse of a matrix
-definite integral and indefinite integral
-order of differential equation
-given a function, calculate left limit and right limit, whether the limit exists
-left inverse....

然后还有convolution、Fourier Transform、Nyquist Theorem,但我忘记是math里的问题还是signal processing的问题了。。。

2. 编程概念
- objects
- OOP
- recursive (写factorial或者fibonacci)
- Write pseudo code for any sorting algorithm. 一亩-三分-地,独家发布
- Write an algorithm to draw a section of an arc if the topmost is a point (y,0)
- Some inheritance questions
. 围观我们@1point 3 acres
3. 一种语言(C、C++、Java或者Python选一个,HR推荐C++和Java,我选的C)
C:
- Pointer questions like *++q and ++*q.1point3acres网
- definition of Typedef.1point3acres网
- malloc and calloc
- usage of <> and #
- They gave me a snippet of a code that copies one string to another and asked me what the function does
- Find the bug in a piece of code.

4. MATLAB基础知识 (都是很简单的基本操作,没有高级东西。只要用matlab写过一阵子程序的话不用复习基本也会)
-difference between function and script
-concatenate matrix ([,] [;]、horzcat、vertcat)
-load a file from command window (load path). Waral 博客有更多文章,
-Compute numerical length of an array (size(A))
-Difference between A.' and A' (no difference for real number,A.' is nonconjugate transpose,A' is conjugate transpose)
- meaning of @, %, ~ (function handler, comment, NOT)
-difference between A^2, A.^2 (dot means element wise operation)-google 1point3acres
-A = 1:1:100;, find every third elements (B=A([3:3:length(A)]))
-A = 1:1:100; find all elements divisible by 5 (find(mod(A,5)==0))
- what's path meaning? used for? (MATLAB's search path/directory)
- || vs. | (|| scalar level, | matrix level). more info on 1point3acres

5. Control (或者signal processing、embedded system,根据背景定)
- characteristic polynomial (defined by determinant)
- Draw the responses of differently damped systems for a 2nd order linear system
- What happens if there are zeros in the system
- Lead-lag compensators
- Lyapunov stability (internal stability)
A continuous-time linear time-invariant system is Lyapunov stable (internally stable) if and only if all the eigenvalues of A have real parts less than or equal to 0, and those with real parts equal to 0 are nonrepeated.
- Controllability and Observability
- Gain Margin and Phase Margin
- Control canonical form
- Why is negative feedback preferred?
- What is PID controller and signify all aspects
- Effects of poles on rise time
- difference between open/close loop control
- what is the criterion of an LTI system to be stable in the continuous time domain? Why?
- what is the criterion of an LTI system to be stable in the discrete time domain? Why?
. From 1point 3acres bbs

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dongxy90 发表于 2016-4-25 07:28:52 | 显示全部楼层
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感谢楼主分享,我也是做control的,拿到了technical phone interview。想请教下楼主,math二选一选了微积分线性代数之后,还会问algorithm的相关问题了吗?
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 楼主| zach 发表于 2016-4-25 12:00:30 | 显示全部楼层
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dongxy90 发表于 2016-4-24 18:28
感谢楼主分享,我也是做control的,拿到了technical phone interview。想请教下楼主,math二选一选了微积分 ...

math是math,编程是编程。。。。分开的
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