Developer(s) DSP Development Corporation 1987; 27 years ago DADiSP 6.5 B05 / December 26, 2012; 20 months ago Active C, C++, SPL Microsoft Windows IA-32, x86 Technical computing Proprietary commercial software DADiSP
Paradigm(s) multi-paradigm: imperative, procedural, object-oriented, array Randy Race DSP Development Corporation late 1990s 6.5 / 2012 dynamic, weak APL, C, C++ Microsoft Windows .spl

DADiSP (Data Analysis and Display, pronounced day-disp) is a numerical computing environment developed by DSP Development Corporation which allows one to display and manipulate data series, matrices and images with an interface similar to a spreadsheet. DADiSP is used in the study of signal processing,[1] numerical analysis, statistical and physiological data processing.[2]

## Interface

DADiSP is designed to perform technical data analysis in a spreadsheet like environment. However, unlike a typical business spreadsheet that operates on a table of cells each of which contain single scalar values, a DADiSP Worksheet consists of multiple interrelated windows where each window contains an entire series or multi-column matrix. A window not only stores the data, but also displays the data in several interactive forms, including 2D graphs, XYZ plots, 3D surfaces, images and numeric tables. Like a traditional spreadsheet, the windows are linked such that a change to the data in one window automatically updates all dependent windows both numerically and graphically.[3][4] Users manipulate data primarily through windows. A DADiSP window is normally referred to by the letter "W" followed by a window number, as in "W1". For example, the formula W1: 1..3 assigns the series values {1, 2, 3} to "W1". The formula W2: W1*W1 sets a second window to compute the square of each value in "W1" such that "W2" will contain the series {1, 4, 9}. If the values of "W1" change to {3, 5, 2, 4}, the values of "W2" automatically update to {9, 25, 4, 16}.

## Programming language

DADiSP includes a series based programming language called SPL (Series Processing Language)[5] used to implement custom algorithms. SPL has a C/C++ like syntax and is incrementally compiled into intermediate bytecode, which is executed by a virtual machine. SPL supports both standard variables assigned with = and "hot" variables assigned with :=. For example, the statement A = 1..3 assigns the series {1, 2, 3} to the standard variable "A". The square of the values can be assigned with B = A * A. Variable "B" contains the series {1, 3, 9}. If "A" changes, "B" does not change because "B" preserves the values as assigned without regard to the future state of "A". However, the statement A := 1..3 creates a "hot" variable. A hot variable is analogous to a window, except hot variables do not display their data. The assignment B := A * A computes the square of the values of "A" as before, but now if "A" changes, "B" automatically updates. Setting A = {3, 5, 2, 4} causes "B" to automatically update with {9, 25, 4, 16}.

## History

DADiSP was originally developed in the early 1980s as part of a research project at MIT to explore the aerodynamics of Formula One racing cars.[4] The original goal of the project was to enable researchers to quickly explore data analysis algorithms without the need for traditional programming.

## Version history

• DADiSP 6.5 B05,[6] Dec 2012

## References

1. ^ Mahmood Nahvi. "Real-Time Digital Signal Processing Design Projects in an Undergraduate DSP Course and Laboratory". Texas Instruments. Retrieved June 1999.
2. ^ "User Interactive Software for Analysis of Human Physiological Data". Nasa Tech Briefs. Retrieved 15 February 1997.
3. ^ "DADiSP Makes Complex Data Analysis Faster and Easier". DSP Development Corp. Retrieved March 2014.
4. ^ a b "DADiSP 2002 Escape from the cell block". Scientific Computing World. Retrieved August 2003.
5. ^ "DADiSP SPL vs. MATLAB". DSP Development Corp. Retrieved March 2014.
6. ^ "DADiSP 6.5 B05 Release Notes". DSP Development Corp. Retrieved March 2014.
7. ^ "DADiSP 6.5". Scientific Computing World. Retrieved June 2010.
8. ^ DADiSP 2.0 Wiley Online Library, The Professional Geographer Volume 44, Issue 1, pages 103–108, February 1992