Octave CLI with AquaTerm on Mac OS X


I’m in need of AquaTerm to plot graphics using gnuplot with octave-cli. In other words, I need the following Octave command to produce a nice little graphical plot

octave:1> sombrero

sombrero.png

To install aquaterm using homebrew

brew cask install aquaterm

Check lib and headers are properly linked

ls /usr/local/lib/libaquaterm*
ls /usr/local/include/aquaterm/*

If that lists nothing, run

ln -s /Library/Frameworks/AquaTerm.framework/Versions/A/AquaTerm /usr/local/lib/libaquaterm.dylib
ln -s /Library/Frameworks/AquaTerm.framework/Versions/A/AquaTerm /usr/local/lib/libaquaterm.1.1.1.dylib
mkdir /usr/local/include/aquaterm
ln -s /Library/Frameworks/AquaTerm.framework/Versions/A/Headers/* /usr/local/include/aquaterm/.

Install gnuplot with aquaterm

brew install gnuplot --with-aquaterm

Run gnuplot and check whether terminal is set to aqua

$ gnuplot 

	G N U P L O T
	Version 5.0 patchlevel 6    last modified 2017-03-18

	Copyright (C) 1986-1993, 1998, 2004, 2007-2017
	Thomas Williams, Colin Kelley and many others

	gnuplot home:     http://www.gnuplot.info
	faq, bugs, etc:   type "help FAQ"
	immediate help:   type "help"  (plot window: hit 'h')

Terminal type set to 'aqua'
gnuplot> test

The test command should produce a nice little plot such as

gnuplot-test.png

Prior versions of octave-cli e.g. 3.8.0 use gnuplot, so you don’t have to do anything else. Newer versions of Octave e.g. 4.2.1 use a different graphics toolkit  that leverages OpenGL. You can switch to gnuplot as follows

octave:1> graphics_toolkit ("gnuplot")

 

PhotoMath


PhotoMath, by MicroBlink Ltd., is a neat little utility available from the iOS App Store, and Android Play Store, that can make solving elementary Math homework less of a chore. Besides giving the answer outright, it provides a detailed step-by-step procedure for arriving at the answer.

Try it while the following equation is displayed on a second screen

2x^2+3=11

It does have its limitations though. An equation such as the following is currently unsolvable

\frac{1}{1-\frac{1}{1+\frac{1}{1-\frac{1}{x}}}}=3

Wolfram Alpha makes short work of that equation when you query it using its \LaTeX representation.