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HP 39gs Graphing Calculator US$55

The HP 39gs is Hewlett-Packard's graphing calculator targeted at students in high school or junior high school. It is the successor to the 39g+, 39G, and 38G, and it is sold alongside the 40gs (equivalent without infrared but with CAS).

The 39gs is aimed directly at the TI-83 and TI-84 graphing calculators, but it is a much better choice, as it is cheaper, more powerful, and easier to use. It has a high-resolution screen and, unique among HP calculators, provides split-screen graphing and has electronic lessons known as "aplets".

Included Accessories

• Hard plastic slide-on case
• USB cable
• Batteries
• 314-page printed user's guide
• CD with Windows-based connectivity software and PDF with 366 pages of additional documentation

Physical Characteristics

• 184 mm by 87 mm by 23.5 mm (7.2" by 3.4" by 0.93"); slide-on case is 19 mm (0.75") thick
• 247 g (8.7 oz)
• White plastic faceplate with textured gray back
• Hard plastic keys with metal domes for fast and accurate typing
• 7 cm (2.7") display with anti-glare protective cover

Technical Specifications

• 131x64 pixel display with adjustable contrast, showing 7 lines with 22 characters
• 75 MHz 32-bit ARM920T processor
• 256 KB RAM
• 1 MB Flash ROM
• Four AAA batteries, providing 50 hours of typical use, and one CR2032 battery
• Piezoelectric beeper
• Powered by battery or USB
• Over 600 functions
• HP part number F2223AA (Data Sheet)

Calculating Environments

• EOS-style algebraic

Communications

• Infrared (for transferring data with another 39gs or 39g+)
• USB (cable included)
• RS-232 serial (cable available separately)

Programmability

• HP Basic programming language
• Write your own "aplets"
• Compilation and decompilation of code built-in
• Full access to all built-in commands, including branching, testing, graphics, matrices, statistics, input and output

Aplets

• Interactive history, notes, and sketch functions for aplets
• Symbolic, numeric, and graphic views available to aplets
• Built-in standard aplets: function, inference, parametric, polar, sequence, solve, finance, linear equation solver, triangle solver, statistics
• Built-in teaching aplets: Quadratic Explorer, Trigonometry Explorer

Applications

• Text editor (Notepad)
• Graphics editing (Sketch)
• Matrix editor
• Finance (time value of money and amortization)

Graphing

• 2-D function, polar, parametric, sequences, histogram, box and whisker plot, scatter plot
• Determine roots, intersections, slope, area, extrema
• Zoom, trace, find coordinates, and shade plots
• Plot multiple equations simultaneously
• Table of values

Probability and Statistics

• Σx, Σx2, Σy, Σy2, Σxy
• Sample standard deviation, population standard deviation, mean
• Curve fitting (linear, logarithmic, exponential, and power regression)
• Plot statistical data
• Hypothesis tests
• Confidence intervals
• Combinations, permutations, factorials, random number generation
• Upper-tail normal distribution, upper-tail chi-square distribution, upper-tail Snedecor's F-distribution, and upper-tail student's t distribution

Scientific

• Decimal hours/degrees to hours/degrees-minutes-seconds conversions
• Angle conversions
• Simple unit conversions
• Constants library, with 29 common physical constants

Mathematics

• Calculus, including derivatives, integrals, and Taylor polynomials
• Matrices, including cross product, determinant, dot product, eigenvalues/eigenvectors, identity, inverse, LQ factorization, least squares, LU decomposition, QR factorization, reduced row echelon form, Schur decomposition, condition number, transposition, and more
• Trigonometry, including hyperbolic and inverse sine, cosine and tangent
• Solving, including a quadratic equation solver, a root finder, a triangle solver, the Solve aplet, and a simultaneous linear equations solver
• Fractions, including modes for proper and improper fractions,
• Decimal functions, finding the integer and fractional parts, the floor and ceiling, the mantissa and exponent, the sign, and rounding or truncating to a specified number of decimal places or significant figures
• Lists, including calculating the sum, product, and differences, and sorting
• Complex numbers
• Summation

Software Library

• Pre-loaded with twelve aplets, and many more HP-provided aplets available as separate downloads
• Hundreds of third party aplets available for download
• Compatible at the binary level with software written for the 39g+, 40gs, 39G, and 40G
• Compatible at the source-code level with most software written for the 38G

Standardized Exam Support

• AP Calculus
• AP Statistics
• AP Chemistry
• AP Physics
• SAT Reasoning Test
• SAT Subject Tests in Mathematics Level 1 and Level 2
• PSAT/NMSQT
• ACT Mathematics Test
• PLAN
• EXPLORE

HP Provided Documentation

• HP 39gs User's Guide, 314 pages, provided in printed form with the calculator
• Mastering the HP 39gs and HP 40gs, 366 pages, provided in electronic form with the calculator
• Thirty Training Modules, totaling 130 pages, provided as a separate download

Warranty and Support

• 1 year limited warranty in the US, provided by HP America
• Toll-free technical support in the US, at 800-HP-INVENT (800-474-6836)

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