Prism User's Guide - CSAIL People - MIT

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88 Prism User S Guide * Field Width - Type a value in this box to change the width of the field that Prism allocates to every data element. For the text representation, the field width specifies the number of characters in each column. If a number is too large for the field width you specify, dots are printed instead of the number. For dither, threshold, colormap, and vector representations, the field width specifies how wide (in pixels) the representation of each data element is to be. By default, dither, threshold, and colormap visualizers are scaled to fit the display window. Note, however, that for dither visualizers, the gray shading may be more noticeable with a smaller field width. For the graph representation, the field width specifies the horizontal spacing between elements. For the surface representation, it specifies the spacing of elements along both directions of the plane. Field Height - For graph and surface representations, changing this value affects the maximum height (in pixels) to which Prism scales every data value. * Precision - Type a value in this box to change the precision with which Prism displays real numbers in a text visualizer. The precision must be less than the field width. By default, Prism prints doubles with 16 significant digits, and floating-point values with 7 significant digits. You can change this default by issuing the set command with the $dprecision argument (for doubles) or $fprecision argument (for floating-point values). For example, set $d recision 11 sets the default precision for doubles to 11 significant digits. * Minimum and Maximum - For colormap representations, use these variables to specify the minimum and maximum values that Prism is to use in assigning color values to the data elements. Data elements that have values below the minimum and above the maximum are assigned default colors. For graph, surface, and vector representations, these parameters represent the bottom and top of the range that is to be represented. Values below the minimum are shown as the minimum; values above the maximum are shown as the maximum. Version 1.2, March 1993 Copyright © 1993 Thinking Machines Corporation
.) ------ p . ....................... ii--- Data------..------- Chapter 5. Vualizing Data By default Prism uses the entire range of values for all these representations. Threshold - For threshold representations, use this variable to specify the value at which Prism is to change the display from black to white. Data elements whose values are at or below the threshold are displayed as black; data elements whose values are above the threshold are displayed as white. By default, Prism uses the mean of the data as the threshold. Displaying a Ruler Choose Ruler from the Options menu to toggle the display of a ruler around the data in the display window. The ruler is helpful in showing which elements are being displayed. Figure 27 shows a 3-dimensional threshold visualizer with the ruler displayed. In the surface representation, the ruler cannot indicate the coordinates of elements in the vertical axis, since they change depending on the height of each element. However, you can press the Shift key and left-click as described above to display the coordinates and value of an element. Version 1.2, March 1993 Copyright 0 1993 Thinking Machines Corporation Figure 27. A threshold visualizer with a ruler. 89
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