Math Minion was originally written to be a sophisticated calculation tool that let me explore thoughts I had on the modelling of numerical problems. It has evolved into a program that I more commonly use to develop little pseudo apps for things like tracking my stock portfolio, weather information and recently my daily steps. It has also been used for more sophisticated stuff like implementing the IAPWS Steam 97 tables and dynamic simulation problems as well as some surprisingly complex string processing.
It combines a mind map style representation of the relationships between expressions, with a formula system that operates transparently on scalars, arrays and matrices. A hierarchical model system helps encapsulate calculations in logical and easily duplicated units and a flexible unit conversion system tracks the fundamental property types through calculations. This allows it to know, for instance, that some fathoms divided by a few days is in fact a velocity that should not be added to a kilogram.
If desired, HTML5 can be used to create advanced interfaces to supplement or even hide the calculation models.
Some interesting features include:
• equations that work equally well with scalars, arrays and matrices
• a function library that in addition to the usual suspects includes:
- matrix multiplication, inversion, eigenvalues, eigenvectors, transpose and redimensioning
- comparison (eq, ne, lt, ge, if etc)
- string functions (split, join, regular expressions, etc.)
- interpolation, indexof, select
- complex number and statistical functions
- time, sorting, random, web reading and many more
• an innovative unit conversion system with automatic dimensional analysis
• data tables for storing and manipulating tabular data whether numeric or string
• models and model arrays for information and calculation encapsulation
• a solver for one or more nonlinear equations
• an optimizer
• an ordinary differential equation solver
• an iterator tool.
• 2D and 3D graphs.
• share sessions between iOS and Mac devices using iCloud
• Can store and retrieve sessions from Dropbox
• Is simply being shared with no advertising, data harvesting or other commercial aspirations.
• Improvements to the ODE solver, including the ability to supply it with table values instead of arrays for Y0, Y and DY/DT. This makes integrating values with different unit types easier.
• Changed the model information panel, so that after using the info button to examine an input or output expression, closing the expression view returns to the original model information panel.
• The split function can now be used without a separator, in which case the first element of the string will be split into an array containing the individual characters, one per element.
• The substr function can now take a negative start value, in which case it will be the position from the end of the string. Thus -1 would be the last character in the string. This makes obtaining the rightmost elements easier.
• Added a utf8 function which will convert back and forth between arrays of byte values and a string value.
• Added a baseunit function which returns a unit value in the base units of the argument.
• Fixed a problem with Copy Of a session menu, where the session immediately following a subfolder wasn’t included in the menu.
• The iterator would not record string values. It now will.
• Minor error reporting improvements.
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- Last changed:
- Jun 09, 2014
- RedTree Development Inc.
- 1.8 MB
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