Mathematical Solutions.........

Regression analysis

Equation graph plotter

Desktop calculators

Conversion utilities

Generic applications


Independent, non-profitable software & charitable initiatives of Dr. Larry Nylund

Regression Analysis - Graphing - Scientific Calculator - Unit Conversion

Multivariable calculator - SimplexCalc v4.1.19 

Get solution for a mathematical expression quickly
SimplexCalc is a multivariable desktop calculator for Windows. It can be used as an enhanced elementary, scientific, financial or expression calculator. In addition to arithmetic operation, more than hundred built-in constants and functions can also be used in your expression.
SimplexCalc also has the unlimited ability to extend itself by using custom (user-defined) variables. You can add your own variables to SimplexCalc in order to tackle complex problems with ease and fun. Even you can compile formula once and then calculate the result many times with different variable values.

Simple and user-friendly interface
SimplexCalc is small and simple to use but with much power and versatility underneath. Features include:

  • Scientific calculations and unlimited expression length
  • Unlimited customizable variables
  • Parenthesis compatible and unlimited nesting for expression
  • Upper case and lower case can be freely used in expression
  • History of calculation sessions
  • You can do standard manipulation with "expression" edit-panel such as cut, copy and paste operations

For example in finance, the mortgage formula for calculating Fixed Monthly Payment P is expressed as:
P = L[c(1 + c)^n]/[(1 + c)^n - 1]
This formula is used to calculate the fixed monthly payment (P) required to fully amortize a loan of L dollars over a term of n months at a monthly interest rate of c. [If the quoted rate is 6%, for example, c is 0.06/12 or 0.005].

Formula: L*(((c/100)/12)*power((1+((c/100)/12));n))/(power((1+((c/100)/12));n)-1)
Assigning variables: L;c;n

Multipurpose calculator - MultiplexCalc v5.4.19 

Solve mathematical expression at high speed
MultiplexCalc is a multipurpose and comprehensive desktop calculator for Windows. It contains more than 100 mathematical functions and constants to satisfy your needs to solve problems ranging from simple elementary algebra to complex equations. Its underling implementation encompasses high precision, sturdiness and multi-functionality.
MultiplexCalc also has the unlimited ability to extend itself by using user-defined variables. You can add your own variables to MultiplexCalc in order to convenience your work. Any instance of a formula can be parsed once, and calculated many times with different variable values.
Features include:

  • Ease of use
  • Unlimited number of variable definitions
  • Scientific calculations and unlimited expression length
  • Parenthesis compatible and unlimited nesting for expression
  • Both expression editing and button-clicking functionality
  • Clipboard smart functionality (cut, copy and paste operations)

For example in finance, a general equation for calculating Future Value of Money is expressed as:
FVn = P * (1 + k/m)(m*n)
P is the initial principal, or present value (denoted as: principal)
k is the annual rate of interest (denoted as: rate)
n is the number of periods - typically years - over which money earns a return (denoted as: years)
m is the number of times per year interest is compounded (denoted as: compounding_times)

Formula: principal*power((1+rate/compouding_times);(compounding_times*years))
Assigning variables: principal;rate;years;compounding_times

Compact calculator - CompactCalc v4.2.19 

Solve algebraic, linear and nonlinear equations
CompactCalc is an enhanced scientific calculator for Windows with an expression editor. It embodies generic floating-point routines, hyperbolic and transcendental routines. With the brilliant designs and powerful features of CompactCalc, you can bring spectacular results to your calculating routines.
CompactCalc features include the following:

  • You can build linear, polynomial and nonlinear equation set
  • Scientific calculations and unlimited expression length
  • Parenthesis compatible and unlimited nesting for expression
  • High precision calculation - features up to 38 digits after the decimal point
  • Accurate result display - features up to 24 digits after the decimal point
  • Calculation range (1.79E-308, 2.22E308)
  • Comprehensive documentation
  • Possibility to enter mathematical formulas as with a keyboard as with button-panel
  • CompactCalc has almost hundred of physical constants and math formula built in, which can be easily accessed and used in calculations. No longer do you have to search the physic textbook for that common formula or physical constant data.

Nonlinear regression analysis- DataFitting v1.7.19 

Quickly Find the Best Equations that Describe Your Data
DataFitting gives engineers and researchers the power to find the ideal model for even the most complex data, by putting a large number of equations at their fingertips. DataFitting's built-in library includes a wide array of linear and nonlinear models from simple linear equations to high order polynomials. DataFitting has the following capabilities:

  • A 38-digit precision math emulator for properly fitting high order polynomials and rationals.
  • A robust fitting capability for nonlinear fitting that effectively copes with outliers and a wide dynamic Y data range.

Graphically Review Curve Fit Results
Once your data have been fit, DataFitting automatically sorts and plots the fitted equations by the statistical criteria of Standard Error. You can preview your graph and output publication-quality graphs in several different configurations. A residual graph as well as parameter output is generated for the selected fitted equation. Data, statistical and numeric summaries are also available from within the report-panel.

Innovative Calculator - InnoCalculator v1.1.19 

The software presented on these pages are for Save-the-Children charity.

Copyright 2017 Institute of Mathematics and Statistics
Helsinki, Finland
All Rights Reserved