# 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)

ungefär ett år ago | 12 downloads |

Submitted

wrightOmegaq

Complex double-precision evaluation of the Wright omega function

mer än 4 år ago | 1 download |

Submitted

waittext

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

mer än 4 år ago | 1 download |

Submitted

quasicrystal

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

mer än 4 år ago | 2 downloads |

Submitted

notify

Display OS X notification message window from Matlab

mer än 4 år ago | 2 downloads |

Submitted

int2bin - bin2int

Convert integer datatype to a binary string and back

mer än 4 år ago | 1 download |

Submitted

char2hex - hex2char

Convert decimal integer string to hexadecimal representation and back

mer än 4 år ago | 3 downloads |

Submitted

circfit

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

mer än 4 år ago | 16 downloads |

Submitted

cdiff

First- and second-order complex step derivative approximation

mer än 4 år ago | 1 download |

Submitted

DynamixelTools

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

mer än 4 år ago | 5 downloads |

Submitted

rigidtform

Optimal rotation and translation between corresponding points

mer än 4 år ago | 1 download |

Submitted

Passive-Dynamic-Walking

Simulation and animation of simple passive dynamic walking models

mer än 5 år ago | 2 downloads |

Submitted

hypergeomq

Fast evaluation of the generalized hypergeometric function

mer än 5 år ago | 3 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...

nästan 7 år 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.

nästan 8 år 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...

ungefär 8 år 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 ...

mer än 8 år 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...

mer än 8 år 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 ...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år ago