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The following parameters define how the X and Y axes are scaled and labeled. A separate set of parameters is provided for each axis.
Scale Method. The selected scale method determines the spacing of the axis primary and secondary tick marks as linear, logarithmic, or cyclic.
Assignment Method. The assignment method specifies how values at the primary tick marks are determined. The base point (the value at the first axis origin tick mark) and end point (the value at the last tick mark on the axis) are either entered by the user or automatically calculated. The base point is the lower end of the range and the end point is the upper end of the range. The assignment method also determines the number of primary tick marks as well as the increment between primary tick marks. Any of the following assignment methods can be selected:
• Automatic (linear scaling). The user specifies the number of primary tick marks. XY Plot calculates the base point, end point, and increment from the data point values of posted curves.
• Automatic (logarithmic scaling). XY Plot calculates the base point, end point, and number of primary tick marks (cycles) from the data point values of posted curves.
• Semi-Automatic (linear scaling). The user specifies the number of primary tick marks, the base point and the increment. These parameters define the end point.
• Semi-Automatic (logarithmic scaling). The user specifies the number of cycles (primary tick marks) and the integral power of 10 corresponding to the base point. These parameters also define the end point.
• Range (linear scaling only). The user specifies the number of primary tick marks and the lower and upper ends of the range. XY plot calculates the increment.
• Manual (linear scaling only). The user specifies the number of primary tick marks and enters the value that is to appear at each primary tick mark.
Label Format. The primary tick mark numeric labels can be displayed in either fixed-point, exponential, integer or power format. The exponential format uses a floating point representation consisting of a signed mantissa, the radix (base number) of 10, and a signed integral exponent of the base number. The power format produces labels of the form 10n, where n is a signed integer. The number of significant digits in the labels is also specified.
The scale method and assignment method parameters are on the
Modify Axis Scale Options, 51. Label format parameters are on the
Modify Axis Label Options, 52. Both of these subordinate forms are accessed from the XY Plot form when Modify is the selected action and Axis is the selected object.