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Extracting data from a matrix
Home Documentation Smile Computing Smile's maths Extracting data from a matrix  
  • To extract a sub-array from a matrix apply extractitem to the array of real of the matrix.

    For instance to extract a rectangular sub-array you would specify a step parameter equal to the matrix' ncols.
  • To extract rows from a matrix apply extractitem to the matrix itself.
  • To extract columns from a matrix apply extractcolumn to the matrix.
    By default, when applied to a matrix, extractcolumn will return one array of real if you extract one column, or one list of arrays of real if you extract more than one column.
  • To extract columns from a matrix and get the sub-array as a matrix, specify extractcolumn [...] as matrix.
  • To extract columns from a matrix and get the sub-array as a tabulated (tab- and return-delimited) string, specify extractcolumn [...] as string.
  • Use the skipping parameter (for instance: skipping 1) to skip the header row(s).
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