HP50g spins circles around the TI-89

[Simone Cerica]

MATH- and ELECTRO-PACK by Heuson contain ZTRANSF: Z-transform, solution of difference equations...

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BODE 2.31
http://www.hpcalc.org/details.php?id=5825
Alain Robillard - Thomas Reitmayr

PDF manual http://download.devbase.at/hp48/bodee.pdf

* Detailed analysis of all zeros and poles of the given transfer function.
* Construction of the multiplied and the factored form of the transfer function.
* Graphical output of a linear approximation and the smooth characteristic of gain and phase.
* Axes of graphs labeled in powers of ten (frequency ), decibel (gain) und radiants (phase).
* Arbitrary dimension of the analysis protocol through organization in text pages and scrollable graphical pages.
* Easily understandable input format.
* Preservation of the last calculated data, which can be recalled at any time.
* Special menu entry for multiplying and factoring a polynomial.

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Bode-Routh
http://www.hpcalc.org/details.php?id=3176
Apolonio Francisco Gonzalez Herrero (APO)

Bode-Routh plotting program with many features. Requires NeoPolys to run.
* Simplicity: Almost the whole commands have been made with input forms with different fields,
whose default values are as often as not enough to obtain a nice result.
* Graphs diversity: In the same library the majority of the necessary tools for system analysis
and design (Bode diagrams, Nyquist, Nichols and Root Locus, as well as the system response to
different inputs -pulse, step, ramp, sine-) have been included.
* System types: Bode-Routh works with continuous and discrete time systems, including a tool that
discretize continuous systems by means of the two methods most commonly used (zero holder
and bilineal transformation).
* Accuracy: One of the main aspects considered when creating this library was to make the results
be as most exact as possible. In this connection some small routines have been programmed to
avoid problems related with the calculator such as rounding errors, angle limitation between 0º
and 180º and so on.

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LOGPLOT
http://www.hpcalc.org/details.php?id=6311
Takashi Matsubara

This library makes log-scale graphs for the 49G/49g+/50g. Plot types "Function", "Scatter" and "Parametric" are implemented. In the type "Function", TRACE and (X,Y) in the 49G plot menu are available. Non-uniform logarithmic tick, zoom-in, zoom-out and recenter are implemented. Faster than previous versions.

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FUMO - DSP Toolbox
http://www.hpcalc.org/details.php?id=4898
Przemyslaw Holubowski

FUMO contains functions allowing digital signal processing. It allows sampling typical or user defined signals, applying window functions, applying FFT (or DFT) transform, convolve, zeropad, and get frequency, phase or group delay responses. Documentation also in Polish. Now requires free registration.

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FFT with Plotter
http://www.hpcalc.org/details.php?id=6785
Frank G Baird

This is an FFT program taken from Oppenheim and Schafer's Digital Signal Processing. Also included is a neat little program PLFFT which plots the magnitudes the results of the FFT program.

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Fourier
http://www.hpcalc.org/details.php?id=6790
Dennis York

A set of programs for digital signal processing. Included are: Discrete Fourier Transform (also does inverse), Fast Fourier Transform, Inverse Fast Fourier Transform, Fourier Transform (selects FFT or DFT depending on size), Inverse Fourier Transform (selects FFT or DFT depending on size), Periodic Convolution, Aperiodic Convolution, Two Dimensional Fourier Transform, Inverse Two Dimensional Fourier Transform, and Axis Shifter for use with Two Dimensional Fourier Transforms.

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Neopolys
http://www.hpcalc.org/details.php?id=3169
Apolonio Francisco Gonzalez Herrero (APO)

A definitive polynomial library. Supports Laplace and Z transforms.