# Andrew Horchler

Followers: 0 Following: 0

We're going to the Moon! I'm the Chief Research Scientist at Astrobotic heading their Future Missions and Technology team (https://astrobotic.com/technology). My Ph.D. in Mechanical Engineering at Case Western Reserve University was in the area of biologically inspired robotics with particular interests in mechanical design, soft robotics, dynamical systems, computational neuroscience, and numerical simulation. I have over 25 years of experience with Matlab and C.

**Programming Languages:**

Python, C++, C, Javascript, MATLAB, HTML, CSS, Arduino, Shell

**Spoken Languages:**

English, French

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CONTRIBUTIONS**17** Files

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**Feeds**

Solved

Toeplitz Matrix

For a given square matrix of order n-by-n check whether this is a Toeplitz matrix or not. Return true if it is.

2 months ago

Solved

Mysterious digits operation (easy)

What is this digit operation? 0 -> 0 1 -> 9 121 -> 9 44 -> 6 15 -> 5 1243 -> 7 ...

2 months ago

Submitted

SDETools

Matlab Toolbox for the Numerical Solution of Stochastic Differential Equations (SDEs)

3 years ago | 8 downloads |

Submitted

wrightOmegaq

Complex double-precision evaluation of the Wright omega function

7 years ago | 1 download |

Submitted

waittext

Display updating line of text or textual waitbar in Matlab Command Window

7 years ago | 1 download |

Submitted

quasicrystal

Generate movie, animated GIF, or image of a quasicrystal via sum of plane waves

7 years ago | 2 downloads |

Submitted

int2bin - bin2int

Convert integer datatype to a binary string and back

7 years ago | 5 downloads |

Submitted

char2hex - hex2char

Convert decimal integer string to hexadecimal representation and back

7 years ago | 3 downloads |

Submitted

circfit

Matlab function for least squares fitting of X-Y data to a circle

7 years ago | 54 downloads |

Submitted

cdiff

First- and second-order complex step derivative approximation

7 years ago | 1 download |

Submitted

DynamixelTools

Matlab Toolbox to control ROBOTIS Dynamixel actuators with the OpenCM9.04 microcontroller

7 years ago | 2 downloads |

Submitted

rigidtform

Optimal rotation and translation between corresponding points

7 years ago | 5 downloads |

Submitted

Passive-Dynamic-Walking

Simulation and animation of simple passive dynamic walking models

8 years ago | 4 downloads |

Submitted

hypergeomq

Fast evaluation of the generalized hypergeometric function

8 years ago | 8 downloads |

Symbolic math- substitute a derivative function with subs()?

A late answer, but maybe this will help others. See <http://stackoverflow.com/a/26998716/2278029 my answer here> on StackOverflo...

9 years ago | 2

Solved

Sum all integers from 1 to 2^n

Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

10 years ago

Solved

Create times-tables

At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

11 years ago

Solved

The Goldbach Conjecture

The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...

11 years ago

Solved

Pizza!

Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

11 years ago

Question

HARDCOPY slower with more figures open?

GETFRAME is slow. I'm using the HARDCOPY function as a faster alternative (it's still way too slow) in order to capture figures ...

12 years ago | 1 answer | 1

### 1

answerSolved

Back and Forth Rows

Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

12 years ago

Solved

Most nonzero elements in row

Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

12 years ago

Solved

Find the numeric mean of the prime numbers in a matrix.

There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

12 years ago

Solved

Remove any row in which a NaN appears

Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

12 years ago