Halcyon Calc Lite

For students, engineers, scientists or people who fondly remember classic calculators, Halcyon Calc Lite is a great application for manipulating numbers and even symbolic expressions. 

Features: 
- Use this calculator on an iPhone, iPod Touch or an iPad 
- Use your finger to quickly scroll through the stack to review intermediate results 
- Copy and paste support 
- Over 225 built-in operations, including trig, logarithms, real functions, complex operations and more 
- Allows you to work with real, complex and integer numbers. 
- Real and complex numbers can be displayed in standard, fixed, scientific and engineering format 
- Integer numbers can be displayed in decimal, hexadecimal, octal and binary bases 
- Work with real and complex matrices and vectors
- Enter symbolic expressions and solve them for different values. Even better, solve quadratic formulas, collect and expand factors and terms, find minima, maxima and roots of any expression. 
- Plot symbolic expressions in X/Y coordinates. Pan the coordinate space by dragging the plot in any direction. Zoom in and out using a pinch gesture.
- Determine symbolic derivative, taylor series or numeric integral of an expression.
- Store numbers, lists, strings and expressions in symbols.
- Store statistical data and calculate totals, averages, standard deviations, linear regressions, etc over that data.
- Calculate the probabilities associated with standard distributions like the normal, F and T distributions.