## Mathematica Q&A: Sow, Reap, and Parallel Programming

April 20, 2011 — Andrew Moylan, Technical Communication & Strategy

Got questions about Mathematica? The Wolfram Blog has answers! We’ll regularly answer selected questions from users around the web. You can submit your question directly to the Q&A Team using this form.

This week’s question comes from Patrick, a student:

How can I use Sow & Reap across parallel kernels?

Before we answer this question, a review of the useful functions Sow and Reap is in order.

Sow and Reap are used together to build up a list of results during a computation. Sow[expr] puts expr aside to be collected later. Reap collects these and returns a list:

The first part of the list is the regular result of the computation. The second part is everything that was “sown”.

Sow and Reap are ideally suited to situations in which you don’t know in advance how many results you will get. For example, suppose that you want to find simple initial conditions that lead to “interesting” results in Conway’s game of life, the famous two-dimensional cellular automaton:

## Mathematica Q&A: Plotting Trig Functions in Degrees

March 31, 2011 — Andrew Moylan, Technical Communication & Strategy

Got a question about Mathematica? The Wolfram Blog has answers! We’ll regularly answer selected questions from users around the web. You can submit your question directly to the Q&A Team using this form.

This week’s question comes from Brian, who is a part-time math teacher:

Trigonometric functions in Mathematica such as Sin[x] and Cos[x] take x to be given in radians:

## Mathematica Q&A: Excluding Points from Plots

March 14, 2011 — Andrew Moylan, Technical Communication & Strategy

Got questions about Mathematica? The Wolfram Blog has answers! Each week, we’ll answer a selected question from users around the web. You can submit your question directly to the Q&A Team.

For our first post in this new series of Mathematica Q&A articles, we’re going to address a very frequently asked question about plotting in Mathematica.

How can I control the appearance of discontinuities in a plot?

The short answer is, use the options Exclusions and ExclusionsStyle! Let’s see how they work.

By default, Plot shows the function 1 ⁄ sin(x) with lines joining its discontinuities: