Eddie's Math and Calculator Blog

HP 41C and DM41L: Basic EKG Calculations Introduction The program calculates the following: *  Lead II magnification, in...

Working with Hyperbolic Sine and Cosine Definition of sinh and cosh Hyperbolic Sine sinh x = (e^x - e^-x) / 2 Hyperbolic Cosine c...

TI 84 Plus CE and HP Prime: Simplified Modulo Expressions I hope you are having a great, at least sane Thanksgiving. It's Turkey Day ...

HP Prime:  Hyperbolic CAS Transformations Introduction These CAS transforms some expressions involving hyperbolic functions, mainly sin...

TI 84 Plus CE, HP 42S/DM42:  Pairs of Multiples Introduction The program MULPAIRS displays all the multiplication pairs of a positive i...

HP 42S DM42 Smith Chart Conversions Smith Conversions Introduction The program SMITH brings generates a custom menu that allows t...

TI-84 Plus CE:  Simple Elliptic Curves Determined by Two Points Introduction The program ECURVE determines the coefficients of a simple...

TI-84 Plus CE:  Bucket Curve Analysis Introduction The program, originally presented by David Burch in the April & May 1985 edition...

HP 12C: Economic Ordering Quantity Introduction In inventory control, a business may try to determine the optimum level of inventory, w...

HP 35S: Determinant and Cramers Rule - 3 x 3 Matrices Determinant of a 3 x 3 Matrix The following program calculates a determinant of a...

HP 41C and HP 42S: Paired T Statistic Introduction The program PAIRT compares two means of two populations.  With this statistic, the p...

HP 12C: Error Function Approximation Introduction The program for the HP 12C calculator approximates the error function defined as er...

HP 12C and HP 41C/DM41L:  Rounding Numbers Introduction The following program rounds positive numbers to the desired decimal amount of ...

Casio fx-CG 50:  Impedance Calculations Introduction The program FX61IMP contains a suite of impedance calculations.  Why the unusu...