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PLEASE USE ONE OF THE FOLLOWING DESCRIPTIONS WHEN UPLOADING DATAVIEWER: One-line, 41-character blurb: Open up a window on your ASCII datafiles! Three line, 159-character blurb: Open up a window on your ASCII datafiles! Take a quick look at the waveform of an entire data set in a full- screen plot, then zoom in with a sliding window. Four line, 228-character blurb: Open up a window on your ASCII datafiles! Take a quick look at the waveform of an entire data set in a full- screen plot, then zoom in with a sliding window that can be effortlessly moved and sized with standard editing keys.
******** DATAVIEWER 1.1 Copyright (c) 9/92 Ed Suominen*********** * * * Open up a window on your ASCII datafiles! Take a quick look * * at the waveform of an entire data set in a full-screen plot, * * then zoom in with a sliding window that can be effortlessly * * moved and sized with standard editing keys. * * * ***************************************************************** DATAVIEWER is shareware; if you find it useful please send $10.00 to: Ed Suominen 16529 28th Ave. W. Apt. A. Lynnwood, Wa 98037 This price was deliberately set low to encourage registration for ALL usages. Please see "Registering: Why ten dollars? " This software is copyright (c) 1992 Ed Suominen. All Rights Reserved. It may be freely copied for purposes of evaluation only, but no more than $5.00 may be charged for its distribution. NO WARRANTY IS EXPRESSED OR IMPLIED FOR DATAVIEWER; THE USER ASSUMES ALL RISKS AND LIABILITIES RESULTING FROM ANY INACCURACY IN PROGRAM EXECUTION, RESULTS, OR DOCUMENTATION. WINDOWS is a trademark of Microsoft Corporation. File Manager, PIF, and CLIPBOARD are features of Microsoft's WINDOWS operating system. C O N T E N T S I. Introduction . . . . . . . . . . . . . . . . . . . . . . . 2 II. Running Dataviewer from DOS or WINDOWS . . . . . . . . . . 2 III. View modes: overview . . . . . . . . . . . . . . . . . . . 3 IV. Color modes. . . . . . . . . . . . . . . . . . . . . . . . 4 V. View modes in detail . . . . . . . . . . . . . . . . . . . 4 a. Full-view mode b. Graphics window mode c. Text window mode VI. The sample datafiles included with Dataviewer. . . . . . . 6 VIII. Registration: Why ten dollars? . . . . . . . . . . . . . . 7 IX. Glossary . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1 - I N T R O D U C T I O N Dataviewer is designed to be a convenient window into large data sets of up to 8000 elements. The spreadsheets and mathematical calculation tools that create these numbers often fail to provide a way to quickly look at the results they generate. Creating plots is usually a tedious process emphasizing aesthetics over direct, immediate, and detailed information. With Dataviewer, insight into the most subtle nuances in these data sets is only a DOS command or mouse click (from WINDOWS File Manager ) away. The plots produced by Dataviewer are of high quality and can be exported by running under WINDOWS or using PRINT-SCREEN under DOS. This program can also be used to support high-end plotting software that is too top-heavy to move quickly around huge datafiles. Dataviewer can be used to monitor the data while it is being prepared, and to select what parts are of interest to plot. It functions well by itself or as a companion to the many excellent plotting programs available that may not have the same speed and agility. While Dataviewer is not a WINDOWS application, it is "WINDOWS-aware. " It was written and tested mostly under WINDOWS, and works smoothly in 386-enhanced mode. WINDOWS 3.1 offers active display of a graphics window, and this can be convenient when Dataviewer is run on a fast 386. "Inverse" color mode has been provided specifically to make it easier to copy plots from Dataviewer into WINDOWS applications. By remaining a native DOS application, however, Dataviewer can help more users gain insight into their work. Requiring just a VGA monitor and perhaps an optional boost from a math coprocessor, this compact program can be tucked into the DOS directory and run from anywhere to view ASCII datafiles. The file reading algorithm is very flexible, and will simply read past non-numeric characters. Any delimiters are acceptable between numbers; commas, spaces, returns, and tabs all work. Entire words can be included in the files and usually will not affect the results. R U N N I N G DATAVIEWER F R O M DOS O R WINDOWS The program's executable file takes up less than 64k of disk space; it will easily fit into the C:\DOS directory of any hard disk. This directory is on the DOS path and the programs in it can be run from anywhere on the hard disk. Dataviewer is meant to be run from the command line. It accepts the name of the datafile right after its program name. No fancy directory listings are provided from the program; use the DOS "dir" command to find the datafile of interest then type "DATA name.extension ". - 2 - If Dataviewer is in the DOS directory, DOS will look there for the executable and run the named datafile in the current directory. If the datafile is not in the current directory, a complete path can be named. For example, "DATA d:\data\sine.dat". If DATA.EXE is in the DOS directory, this is never necessary; just use the DOS "cd" command to go to where the data is. Running Dataviewer under WINDOWS is even simpler. File Manager provides a command "Associate" in the "File" menu. Select it and type "DAT" for the extension and "C:\DOS\DATA.EXE" in "Associate with. " Then, to look at a datafile, simply double- click on any file with the extension ".DAT" . THIS SECTION ASSUMES FAMILIARITY WITH WINDOWS Dataviewer is useful for viewing data in a temporary datafile to monitor work in a spreadsheet or mathematical software. Copy DATA.EXE to C:\DOS and create a program icon with properties: DESCRIPTION: Temp Data COMMAND LINE: C:\DOS\DATA.EXE C:\TEMP\DATA.DAT When working, create the datafile DATA.DAT in the C:\TEMP directory, then double-click on the icon "Temp Data". The temporary datafile will be viewed in a window. A PIF ( Program Information File ) is included which will run Dataviewer in a window in 386-enhanced mode. Copy it into the WINDOWS directory and give it a try. If your CPU is too slow to support windowed graphics, change the PIF to full-screen. V I E W M O D E S : O V E R V I E W All three viewing modes in Dataviewer are based on the idea of a "data window" into the overall data set. Usually the data set will be many times the size of the data window, which can be adjusted to a width of 5, 10, 15, 20, 30, and 60 samples. These three modes are described in greater detail later in this document. The program starts up with a view of the overall plot, "full-view" mode (F2 selects). The data window is represented by a dashed box; its borders will fill the screen when either the graphics or text data window is selected. Using the standard keyboard editing keys (arrows, Page up, Page down, Tab, Home, and End ) this box and the data window it represents may be quickly moved to any position. When "graph" (F3 selects) is selected, the data within the dashed box will fill a full-screen plot. This allows close inspection of the waveform. Scrollbars are provided to help keep track of the data window position in the entire data set. "Text" (F4 selects) is most useful for viewing the actual - 3 - numerical data. Both floating point and scientific notation are shown side by side. Extremely small or large numbers are simply represented as "~ 0" and "~ (infinity sign)." A vertically oriented text-symbol version of the graph plot is displayed in a window to the right of the data. C O L O R M O D E S All of these viewing modes can be displayed in either monochrome ("BW"), VGA 16-color ("Color"), or inverse monochrome ("Inverse"). monochrome is the fastest to display; it uses 2-color VGA mode and one fourth the video memory of 16-color VGA. It only gives an advantage when run full-screen, either under DOS or WINDOWS. It will as slowly as color in a WINDOWS graphics window, and will display everything as blue. Use monochrome mode in a full-screen to quickly move around or clarify a dim color of interest. Color is the best all-around mode, and is the default. It looks good in either full-screen or a WINDOWS graphics window, though windowed operation is too cumbersome for much movement in anything slower than a 386DX-33. Find the area of interest in full-screen, and then put it into a graphics window with the WINDOWS keystroke ALT-ENTER. Text view will display quickly in color either windowed or full-screen because it is character based. Inverse monochrome has been provided to make it easier to copy data from Dataviewer into WINDOWS applications with the CLIPBOARD. WINDOWS documents are black-on-white, and ordinary DOS graphics data will print out as white-on-black. Inverse mode will make the data look more like it came out of a WINDOWS application, and will save toner or ink in your printer. Inverse mode is NOT recommended for full-screen or DOS use; the numerics do not display in the graphics-based views. Text mode shows blue-characters on white in any display, and might seem preferable if you're used to WINDOWS text. F U L L - V I E W M O D E D E T A I L S One of the difficulties in mapping a big ( up to 8000 elements ) data set into a VGA screen ( 640 pixels ) is that much of the information must be thrown out ( "decimated" ). To help deal with this, full-view mode displays two plots when decimation takes place. The upper plot is called an AVERAGE plot. It plots a pixel at the AVERAGE y-position of all the data elements "stuffed" into it. With 8000 elements of data, each pixel is an average of twelve data points. This plot is useful for viewing low-frequency trends in a waveform because it filters out the high frequency variations. The lower plot only displays when there are more data elements than VGA pixels ( 640 ). It draws a line from the - 4 - minimum value "stuffed" into a pixel to the maximum. This creates an ENVELOPE plot; the maximum variations of the waveform at each pixel position are shown. This can mask low-frequency trends shown by the AVERAGE plot, but is essential for seeing that the waveform does have high-frequency variations that warrant closer inspection in a data window. The data window can be moved in full-view mode just as in the window modes; the dashed box will show where the window would be. If an interesting squiggle is seen, the box can be moved and sized so that it fits right around it; then graphics window mode will show the squiggle in a full-screen plot. G R A P H I C S W I N D O W M O D E D E T A I L S Graphics will likely be the most frequently used mode. It draws a full-screen plot of the data window and allows very detailed viewing of the data waveform. The data points are displayed with square symbols and are connected by lines. The first and last data points in the window are not given symbols, but are "attached" to the plot borders. The scrollbars below and to the right of the plot show the size and position of the data window in relation to the entire data set. The horizontal scrollbar is the easiest to understand; as the data window moves right and left along the entire data set, the scrollbox moves right and left along the scrollbar. Move the data window to the first element with the HOME key and the scrollbox will move to the left. Increase the size of the data window and the scrollbox will become bigger. The vertical scrollbar is less obvious. It also shows the size and position of the data window, but in the vertical direction. The vertical size and position of the data window is not something that can be adjusted manually. The vertical scaling and position of the data window is automatic, and changes with the waveform. If the waveform has its maximum amplitude at a particular position ( sample number ) in the data set, the data window will be full-size; the vertical scrollbox will fill the scrollbar. If the waveform is flat at a position, the scrollbox will be very small. The position of the scrollbar is simply the vertical offset of the data window at that particular sample position; it shows how "high up" the data window is on the waveform. The use of the scrollbars is best learned by moving around a waveform. The sample datafile GIBBS.DAT has many variations that will move the data window and vertical scrollbar all over at different sample positions. Exploring the waveform in detail and checking the scrollbars at each position will make their purpose more clear than can be explained here. - 5 - T E X T W I N D O W D E T A I L S The text window provides the actual numbers behind the waveform viewed in the other two modes. Floating-point format ( if the number isn't too big or small ) and scientific notation are displayed. Keeping track of the window position is aided by the symbol plot in the right window and a position scrollbar ( equivalent to the horizontal scrollbar in graphics mode ). This plot and scrollbar are vertically oriented to display side-by-side with the numbers. The graphics plot is simply turned on its side, with the y-axis labels expanded into greater precision. Since text mode only displays 25 rows, the data window size is forced to the 20-sample size. It will stay at this when another mode is entered to keep comparisons accurate. This can be confusing if the window is expanded to 60 samples and then text mode is entered; the window will be automatically shrunk to one-third its original size without warning. Since text mode is character-based, copied data from it will be pasted as plain text into WINDOWS applications and the PRINT SCREEN key will yield a character printout. It is also displays more quickly than the graphics mode. S A M P L E D A T A F I L E S Included with Dataviewer are seven sample datafiles. The first one to look at is "GIBBS.DAT". This shows one cycle of a non-ideal square wave. The overshoots and high-frequency variations are known as "Gibbs's phenomenon; " they result from a filtered square wave containing only a limited number of harmonics. Zoom in on the overshoots with the data window and observe the correlation between the size of the dashed box in full-view mode, the graphics data window, and the scrollboxes. The AVERAGE and ENVELOPE plots look the same for this plot because, although the datafile is decimated, there are not two data points per VGA pixel to draw lines between. The lower plot begins to be useful with datafiles of more than 1240 elements; it isn't even displayed when there are fewer than 620 ( the number of VGA pixels in the plot ). "AM.DAT" shows an amplitude-modulated waveform. The carrier frequency is very high and will only show up as white in the ENVELOPE full-view plot. Zoom in with the data window to see the carrier sine wave. Look at the smallest parts of the modulating envelope ( elements 1525-1545 ) with the text window and note the symmetry of the very small values on either side of zero. This is a bigger data set; use TAB and SHIFT-TAB to move the window in bigger jumps. "AM_S.DAT" is a spectral plot of the waveform of "AM.DAT; " it is included to show off Dataviewer's ability to look at a very wide range of values in a single data set. This datafile was created by running an FFT on AM.DAT. Since the FFT - 6 - was performed with a finite precision floating-point numbers, it has noise on either side of the actual signals. Take a look for yourself; you may never have seen such imperfections in an FFT before! "2TONE.DAT" was produced by superimposing two signals close in frequency. The varying envelope is a beat note; its frequency is the difference between the two signals. "DACOUT.DAT" shows the output of a simulated 3-bit digital-to-analog converter; only 8 discrete output levels are present. "DACOUT_F.DAT" shows the signal after it has been lowpass filtered ( with an FIR algorithm ). Zoom in with a window and note how the filtering in the second datafile has rounded off the square steps present in the first. These are smaller data sets; note that the full-view plot does not display, since there are fewer data elements than VGA pixels. Finally, to get a look at very big data numbers look at "EXP.DAT". This is a plot of the natural constant "e" to the power of x, also denoted as exp( x ). The full-view plot doesn't even show the curve on the left side because it scales to the gigantic numbers on the right side. Interestingly, The graphics and text windows will show the same exact plot for any position in the data set; this is because of calculus: d x x --- e = e d x The function grows by the same percentage at each position, so it looks the same everywhere. The labels show the huge size to which the function actually grows. R E G I S T R A T I O N : W H Y T E N D O L L A R S ? Dataviewer is priced low to encourage registration for all uses. Much of today's software is priced so high that occasional users and students are tempted to pirate it. It seems unreasonable to pay hundreds of dollars for a slick software package that will get used for a single college class or project. It is just as irritating to part with that money to get features that should have been built into programs already sitting on the hard drive. Paying a mere ten bucks for Dataviewer should provide relief from this frustration. Some example uses of Dataviewer that require registration of $10: 1. As a tool for use with high-end mathematical, spreadsheet, or plotting software 2. As a stand-alone plotter for casual use 3. For use in a single high school or college class or major project 4. Installation on the hard drive of an individual PC in a school computer lab - 7 - 5. Installation on an individual test station on a production line You get the idea. Use the software, but please pay for it. The only use of Dataviewer that does not require registration is evaluation on a single casual project or assignment to decide whether or not to use the program in the future. This author is sensitive to the plight of student users and the high prices they face in order to learn with modern software tools. The ten dollar registration for Dataviewer will likely be the smallest single software payout made over the course of a college education. Whatever your application, please help pay the author (me!) for my work. I'll need quite a few $10 registrations to just break even on my time spent developing Dataviewer for you. I hope to see your name among them. All that you will receive in exchange is a combination thank-you letter / official software license with a phone number for technical support, and another person's gratitude, but for ten bucks that might be a good deal all by itself. G L O S S A R Y data set: A one-dimensional array of data that can be plotted with a line graph. A common examples of a data set is a checking account balance over time. If the weekly balances were put into a datafile, a line graph could be drawn from the resulting "data set. " Scientific software and spreadsheets often produce huge data sets from mathematical functions. datafile: An ASCII text file containing numbers separated by any non-numeric character or group of characters. data window: A magnification of a section of the entire data set, viewed either in a graphics plot or text columns and plot. Can be sized and moved with standard editing keys. The "data window" is represented in full-view mode by a dashed box. graphics window: A box on the screen in which the program is run in graphics mode under WINDOWS or other windowing operating system. Dataviewer has an virtual 8086 processor all to itself and the graphics commands it sends to the video card are trapped and handled by the operating system. Works only with 386 processors, and fast ones at that. - 8 -
I N V O I CE Remit to: From: Ed Suominen _________________________________ 16529 28th Ave. W. Apt. A. Lynnwood, WA 98037 _________________________________ _________________________________ _________________________________ Contact individual: _________________________________ _________________________________ Qty Unit Price Total _____ Dataviewer license only $10.00 ____________ _____ Dataviewer license with $15.00 ____________ latest version software on disk Total ____________ I use 5 1/4" _________ 3 1/2" __________ disks Comments ________________________________________________________ _________________________________________________________________ _________________________________________________________________ Thank you for your registration! Upon receipt of this paid invoice, printed software license or licenses will be sent. If software on disk is requested, the latest version of Dataviewer will be sent. Please note that this may not have changed from the release included with this invoice document file.
Volume in drive A has no label Directory of A:\ READ ME 627 9-14-92 12:51p DATA EXE 61888 9-13-92 10:40p DATA PIF 545 9-14-92 11:52a DATA TXT 20263 9-14-92 1:31p INVOICE TXT 1300 9-13-92 10:51p BLURB TXT 627 9-13-92 10:55p GIBBS DAT 20021 8-18-92 12:16p 2TONE DAT 22500 9-14-92 11:37a AM DAT 46080 9-14-92 11:45a AM_S DAT 47239 8-31-92 1:03p DAC DAT 5760 9-14-92 10:01a DAC_FILT DAT 5615 9-14-92 10:21a EXP DAT 1931 9-05-92 8:31p GO BAT 36 10-05-92 3:14p SHOW EXE 2040 9-12-88 10:48a 15 file(s) 236472 bytes 79872 bytes free