Thursday, September 21, 2017

Retro Review: Texas Instruments TI-35 PLUS

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Retro Review:  Texas Instruments TI-35 PLUS Essentials Company:  Texas Instruments Type:  Scientific Year: 1986 Batter...

Retro Review: Sharp EL-506G

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Retro Review:  Sharp EL-506G Essentials Company:  Sharp Type:  Scientific Year: 1992 Battery:  LR44 x 2, back case is ...
Saturday, September 9, 2017

Next Week... and Plans for October 2017

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I'm so excited, can't want for next week's HHC 2017 calculator conference in Nashville!  It is my annual calculator conference ...
Wednesday, September 6, 2017

Fun with the TI-80

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Fun with the TI-80 TI-80 Program D2DMS - Decimal to Degrees-Minutes-Seconds Variables: Decimal Format: D = decimal DMS...
Monday, September 4, 2017

Retro Review: Texas Instruments TI-80

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TI-80 TI-80 (left), TI-84 Plus CE (right) Look how thin the TI-80 is Retro Review: Texas Instruments TI-80 First, thank ...
Friday, September 1, 2017

TI-84 Plus CE: Fitting Points to an Ellipse

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TI-84 Plus CE: Fitting Points to an Ellipse Back to one of my favorite subjects: curve fitting. The program ELLIPFIT attem...
Wednesday, August 30, 2017

TI-84 Plus CE: Fitting a Parametric Line

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TI-84 Plus CE:  Fitting a Parametric Line The program PARLIN attempts to fit a parametric line for a collection of points (x(t), y(t))...
Friday, August 25, 2017

HP Prime: Shewhart X-Bar Chart (Quality Chart)

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HP Prime:  Shewhart X-Bar Chart (Quality Chart) Introduction and Calculation The program XCHART generates five variables that desc...