# Andrew Horchler

### Astrobotic

We're going to the Moon! I'm the Principal 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 20 years of experience with Matlab and C.

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**Content Feed**

Submitted

SDETools

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

1 year ago | 11 downloads |

Submitted

wrightOmegaq

Complex double-precision evaluation of the Wright omega function

5 years ago | 1 download |

Submitted

waittext

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

5 years ago | 3 downloads |

Submitted

quasicrystal

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

5 years ago | 1 download |

Submitted

int2bin - bin2int

Convert integer datatype to a binary string and back

5 years ago | 4 downloads |

Submitted

char2hex - hex2char

Convert decimal integer string to hexadecimal representation and back

5 years ago | 4 downloads |

Submitted

circfit

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

5 years ago | 8 downloads |

Submitted

cdiff

First- and second-order complex step derivative approximation

5 years ago | 3 downloads |

Submitted

DynamixelTools

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

5 years ago | 4 downloads |

Submitted

rigidtform

Optimal rotation and translation between corresponding points

5 years ago | 1 download |

Submitted

Passive-Dynamic-Walking

Simulation and animation of simple passive dynamic walking models

5 years ago | 2 downloads |

Submitted

hypergeomq

Fast evaluation of the generalized hypergeometric function

6 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...

7 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.

8 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...

8 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 ...

8 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...

8 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 ...

9 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...

10 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...

10 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...

10 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...

10 years ago

Solved

Swap the first and last columns

Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

10 years ago

Solved

Weighted average

Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

10 years ago