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## every

The every keyword allows a periodic sampling of a data set to be plotted.

For ordinary files a "point" single record (line); a "block" of data is a set of consecutive records with blank lines before and after the block.

For matrix data a "block" and "point" correspond to "row" and "column". See matrix every.

Syntax:

          plot 'file' every {<point_incr>}
                              {:{<block_incr>}
                                {:{<start_point>}
                                  {:{<start_block>}
                                    {:{<end_point>}
                                      {:<end_block>}}}}}

The data points to be plotted are selected according to a loop from <start_point> to <end_point> with increment <point_incr> and the blocks according to a loop from <start_block> to <end_block> with increment <block_incr>.

The first datum in each block is numbered '0', as is the first block in the file.

Note that records containing unplottable information are counted.

Any of the numbers can be omitted; the increments default to unity, the start values to the first point or block, and the end values to the last point or block. ':' at the end of the every option is not permitted. If every is not specified, all points in all lines are plotted.

Examples:

          every :::3::3    # selects just the fourth block ('0' is first)
          every :::::9     # selects the first 10 blocks
          every 2:2        # selects every other point in every other block
          every ::5::15    # selects points 5 through 15 in each block

See simple plot demos (simple.dem) , Non-parametric splot demos , and Parametric splot demos .