A free app for Android, by Michael Neuroth.
Do you ever get tired of opening a document to find out what you wrote down last time? Or having to re-create a graph you want to show your professor? It is time to write a program that can generate any kind of plot from your text!
Gnuplot is a free, interactive plotting program. It allows you to enter text commands in a simple, intuitive way and get the exact results you are looking for. It can read both numbers and letters and supports a wide range of mathematical functions. You can use it to generate pretty much any plot you can think of, from the simplest ones to the most complex. You can use it to generate graphs, charts, and even 3D plots.
All you have to do is write down your plot, select the function you want to use, and generate your plot. It is very easy to use and you can enter as many commands as you want in a single script.