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Making Graphs 19 SetText (title$, hlab$, vlab$) SetText sets the current text for the title, horizontal label, and vertical label. If any of these texts are null strings, that space is added to room for the data display. AskText (title$, hlab$, vlab$) AskText returns the current texts of the title, horizontal label, and vertical label. It returns the null string for those labels which don’t yet have values. Color Schemes Whenever you draw a graph, you must give a color scheme. It tells what colors to use for the graph’s title, frame, and data. Usually a color scheme gives at least three colors. The first is the title’s color. The second is the frame’s color. (The frame includes the horizontal and vertical labels.) And the remaining colors are used, in sequence over and over, for the data values. For example, a color scheme “white blue red yellow green” gives a white title, blue frame, and data colors which cycle from red to yellow to green and back to red again. If you give fewer than three colors, the last color is used to fill out the remaining colors. So the color scheme “red green” gives a red title, green frame, and green data. The color scheme “white” draws everything in white. The null color scheme ““ simply uses the current foreground color for everything. What Color Names Can You Use? You can use any True BASIC color in the color scheme. In particular, you might want to use “background” if you’ve used SetCanvas to change the graph’s canvas color. Then you can use the real background color to get a reverse-video effect. You can also use colors such as “1” or “13” to access any of your computer’s colors, even if they lack True BASIC names. For example, the color scheme “white 1 12” gives a white title, frame in color #1, and data in color #12. Canvas Colors The SetCanvas routine controls the canvas color. For example, call SetCanvas(“red”) gives you a red canvas. As in color schemes, you can use numbers like “13” as well as color names. Once you’ve set the canvas color, all graphs will use this color until your program stops or you call SetCanvas again. For more information, see the “Advanced Graph Control” section. 01/01
20 Statistics Graphics Toolkit Your Computer’s Modes Most computers have several graphics modes. You can use the Statistics Graphics Toolkit in any graphics mode. If you don’t pick a mode, the Toolkit will switch to mode “GRAPHICS” before it begins to draw. (Exception: it will use an EGA mode on IBM PCs and PS/2s with EGA cards.) To control the mode, use True BASIC’s set mode statement to switch to that mode before you call any Toolkit routine. For example, use the set mode “medres” statement on an IBM PC with EGA adaptor to draw in the medium resolution mode. Many graphs cannot be drawn in low or medium resolution. The textual labels don’t fit in the space allowed. Therefore, you may wish to switch to a high resolution before drawing a graph. On an IBM PC with a Color Graphics Adaptor, for instance, you may wish to set mode “hires” before you call any Toolkit routines. Point and Line Styles Point styles are used for graphing data points. The line styles can be used to connect data points, add confidence bands, or show fitted curves. You can also use GraphPoint and GraphLine to draw points and lines wherever you wish. They’re described in the “Advanced Graph Control” section. Available Point Styles Point styles are numbered from 1 to 13. You may also use style 0, which means that no point should be drawn. The visible styles are: Style Appearance Style Appearance 1 dot 8 down triangle 2 plus 9 diamond 3 asterisk 10 solid box 4 circle 11 solid up triangle 5 X 12 solid down triangle 6 box 13 solid diamond 7 up triangle 01/01
Page 2 and 3: TRUE BASIC REFERENCE SERIES: Statis
Page 4 and 5: Introduction 3 Two-Tailed Probabili
Page 6 and 7: Getting Started 5 Getting Started L
Page 8 and 9: Getting Started 7 scheme for this g
Page 10 and 11: Getting Started 9 the same data, sh
Page 12 and 13: Getting Started 11 Figure 43.07: Ou
Page 14 and 15: Getting Started 13 Figure 43.10: Ou
Page 16 and 17: Conversions Between Strings and Num
Page 18 and 19: Conversions Between Strings and Num
Page 22 and 23: Making Graphs 21 Available Line Sty
Page 24 and 25: Simple Statistics 23 Simple Statist
Page 26 and 27: Simple Statistics 25 PrintStats (#n
Page 28 and 29: Simple Statistics 27 BoxPlot (data(
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Page 32 and 33: Simple Statistics 31 KurtosisP (dat
Page 34 and 35: Frequency Distributions 33 Frequenc
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Page 38 and 39: Frequency Distributions 37 Relative
Page 40 and 41: Histograms and Frequency Polygons 3
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Scatter and Residual Plots 85 PlotM
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Box Plots of Observations 87 Figure
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Mixing Statistics, 3-D, Scientific
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Data Transforms 93 Data Transforms
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Data Transforms 95 AsinTran (x()) A
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Simulated Distributions 99 Simulate
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Sampling 103 Sampling This section
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Subscript Functions 105 Complete Li
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Subscript Functions 107 Regression
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Advanced Graph Control 109 Implicit
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Advanced Graph Control 111 and/or S
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Advanced Graph Control 113 SetGraph
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Advanced Graph Control 115 SetAxesT
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Customized Legends 117 Customized L
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Trouble-Shooting Graphics 119 There
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Trouble-Shooting Graphics 121 left
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Low-Level Control of the Frame 123
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Error Messages 135 Error Messages T
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Error Messages 137 736 Not enough d
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