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interp

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• name:
  interp
• synopsis:

  interp inputfile [-nowarnings] [-order= integer] [-format=" format-string"] [-swap_input_columns] [-swap_output_columns] [-branch= integer] { -range= file,n_pts[ ,lower,upper] [-periodic] | -at_values= value_to_interp_at[ ,value...] | -transform= original-data,transformed-data,abscissa_column,interp_column[ ,new_label] }

• description:
  

  interp does polynomial interpolation on a data set, using whatever order of polynomial the user requests, with options for creating a new data set with interpolated values at equispaced points and for transforming one variable of a data set via interpolation on the first data set.

• files:
  inputfile contains the data set that will be interpolated. The data set should have monotonically ordered abscissae; if not, the first branch will be taken unless the user specifies another branch.
• options:

  nowarnings

  
  By default, if an attempt is made to interpolate outside the domain of inputfile, a warning is given. This output requests that such warnings be suppressed.

  order

  
  Specifies the order of the interpolating polynomial. The default is 1, indicating linear interpolation using the two nearest points.

  format

  
  Specifies a C-style format string for printing the data to the output file.

  swap_input_columns, swap_output_columns

  
  These options request that interp interchange the roles of the columns in the input and output files, respectively.

  branch

  
  For data sets that are multivalued, this option specifies the branch to use. The default is 1, for the first branch.

  range

  
  Requests interpolation at a specified number of equispaced points. By default, the lower and upper limit of the points corresponds to the domain of the data being interpolated.

  periodic

  
  Specifies that the data being interpolated be considered a periodic function with period equal to the length of the data set in inputfile. Valid only with the range option.

  at_values

  
  Requests interpolation at a series of specified points, with output to the terminal.

  transform

  
  Requests transformation of a specified data set using interpolation. original-data is the name of the file containing the data set to be transformed, the result being placed in transformed-data. abscissa_column is either 0 or 1, and specifies which column of original-data will be used as the abscissa for transformed-data. interp_column is either 0 or 1, and specifies the column of original_data that gives the values at which inputfile will be interpolated to obtain the ordinates for transformed_data.