To guard against erroneous data values, which can corrupt the fit obtained, the application then performs a number of iterations. It calculates a noise estimate for each bin according to the rms deviation of data values in the bin from the straight-line fit obtained previously. It then re-bins the data, omitting values which lie more than a specified number of standard deviations from the expected value in each bin. The straight-line fit is then re-calculated. You can specify the number of standard deviations and the number of iterations used.
A plot is produced after the final iteration showing the bin centres, with error bars representing the spread of values in each bin. The best fitting straight line is overlayed on this plot.
Optionally, an output NDF can be created containing a normalised version of the data array from the first input NDF.
For the special case of two-dimensional images, if IN2 spans only a single row or column, it can be used to normalize each row or column of IN1 in turn. See Parameter LOOP.
A comma-separated list of strings should be given in which each string is either an attribute setting, or the name of a text file preceded by an up-arrow character " ". Such text files should contain further comma-separated lists which will be read and interpreted in the same manner. Attribute settings are applied in the order in which they occur within the list, with later settings overriding any earlier settings given for the same attribute.
Each individual attribute setting should be of the form:
name = value
where name is the name of a plotting attribute, and value is the value to assign to the attribute. Default values will be used for any unspecified attributes. All attributes will be defaulted if a null value (!)--the initial default--is supplied. To apply changes of style to only the current invocation, begin these attributes with a plus sign. A mixture of persistent and temporary style changes is achieved by listing all the persistent attributes followed by a plus sign then the list of temporary attributes.
See Plotting Attributes for a description of the available attributes. Any unrecognised attributes are ignored (no error is reported).
The appearance of the best-fitting straight line is controlled by the attributes Colour(Curves), Width(Curves), etc. (the synonym Line may be used in place of Curves). The appearance of markers is controlled by Colour(Markers), Width(Markers), etc. (the synonym Symbols may be used in place of Markers). The appearance of the error bars is controlled using Colour(ErrBars), Width(ErrBars), etc. Note, Size(ErrBars) controls the length of the serifs (i.e. the cross pieces at each end of the error bar), and defaults to 1.0. [current value]
KAPPA --- Kernel Application Package