New Editor's Choice Applications

Spectogram Generator

Samir Khan — Wed, 13 Mar 2013 04:00:00 Z

This application lets you load wave files, apply windows and IIR/FIR filters, and view the spectrogram, power spectrum and waveform. You can also set filter cut-off frequencies by clicking on the power spectrum plot.

Periodicity of Sunspots

Samir Khan — Wed, 13 Mar 2013 04:00:00 Z

This application finds the periodicity of sunspots with two independent approaches

a frequency domain transformation of the data,
and autocorrelation.

If implemented and interpreted correctly, both approaches should give the same sunspot period. The application uses routines from Maple 17’s new Signal Processing package, and uses historical sunspot data from the National Geophysical Data Center. Additionally, an embedded video component demonstrates how you can zoom into a plot.

Filtering Frequency Domain Noise

Samir Khan — Wed, 13 Mar 2013 04:00:00 Z

This application demonstrates how you can filter low-power noise from the frequency domain representation of experimental data.

Graph Theory Editor

Jeff Knisley — Sat, 29 Dec 2012 05:00:00 Z

A component for editing Maple Graphs, along with tools for visualization and for import/export from GraphML.

Gems 26-30 from the Red Book of Maple Magic

Dr. Robert Lopez — Tue, 04 Dec 2012 05:00:00 Z

In 2011, this column published five "Maple Magic" articles, each containing five "gems" gleaned from interactions with Maple and the Maplesoft programmers. Here are five more recent additions to the Red Book, every one of which contained something about Maple that was a surprise to me, experienced Maple user that I am.

Portfolio Optimization with the Omega Ratio

Samir Khan — Thu, 22 Nov 2012 05:00:00 Z

This application finds the asset weights that maximize the Omega Ratio of a portfolio of ten investments, given their simulated monthly returns and a target return. This is a non-convex problem, and requires global optimizers for a rigorous solution. However, a transformation of the variables (only valid for Omega Ratios of over 1) converts the optimization into a linear program.

This application implements both approaches, the former using Maple's Global Optimization Toolbox, and the latter using Maple's linear programming features. For the data set provided in this application, both approaches give comparable results.

SCRABBLE® Two-to-Make-Three Quiz

Dr. Paulina Chin — Wed, 07 Nov 2012 05:00:00 Z

Players of SCRABBLE® and similar word games find it useful to know all the valid three-letter words that can be formed from a valid two-letter word. For example, in the SCRABBLE® game, knowing these words allows you to find places where you can "hook" onto a word already on the board. This application below tests your knowledge of the hooks for two-letter words.

Pole Locations and Performance Characteristics

Maplesoft — Mon, 05 Nov 2012 05:00:00 Z

This control theory application explores how the behavior of a system is determined by the position of the poles and zeros.

This document is part of the collection of Classroom Content: Control Theory package.

The Hydrogen Atom Orbitals

Giulio Dujany — Fri, 08 Jun 2012 04:00:00 Z

Almost a century after their modeling in quantum mechanics as wave functions, hydrogen's orbitals have become a common subject in High school and even previous degree of education. In this worksheet is shown as Maple provides useful tools for studying and visualizing the hydrogen's orbitals. In particular interactive components can provide a useful didactic aid easily generating and visualizing the wave functions, and different probability plots (radial, orbital).

Statistics Enhancements in Maple 16