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Stock Traders Find Speed Pays, in Milliseconds

 
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Old 07-25-2009
Stock Traders Find Speed Pays, in Milliseconds

by CHARLES DUHIGG New York Times It is the hot new thing on Wall Street, a way for a handful of traders to master the stock market, peek at investors' orders and, critics say, even subtly manipulate share prices.* It is called high-frequency trading - and it is suddenly one of the most talked-about and mysterious [...]

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Spreadsheet::WriteExcel::Chart::Stock(3pm)		User Contributed Perl Documentation		Spreadsheet::WriteExcel::Chart::Stock(3pm)

NAME
Stock - A writer class for Excel Stock charts. SYNOPSIS
To create a simple Excel file with a Stock chart using Spreadsheet::WriteExcel: #!/usr/bin/perl -w use strict; use Spreadsheet::WriteExcel; my $workbook = Spreadsheet::WriteExcel->new( 'chart.xls' ); my $worksheet = $workbook->add_worksheet(); my $chart = $workbook->add_chart( type => 'stock' ); # Add a series for each Open-High-Low-Close. $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$B$2:$B$6' ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$C$2:$C$6' ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$D$2:$D$6' ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$E$2:$E$6' ); # Add the worksheet data the chart refers to. # ... See the full example below. __END__ DESCRIPTION
This module implements Stock charts for Spreadsheet::WriteExcel. The chart object is created via the Workbook "add_chart()" method: my $chart = $workbook->add_chart( type => 'stock' ); Once the object is created it can be configured via the following methods that are common to all chart classes: $chart->add_series(); $chart->set_x_axis(); $chart->set_y_axis(); $chart->set_title(); These methods are explained in detail in Spreadsheet::WriteExcel::Chart. Class specific methods or settings, if any, are explained below. Stock Chart Methods There aren't currently any stock chart specific methods. See the TODO section of Spreadsheet::WriteExcel::Chart. The default Stock chart is an Open-High-Low-Close chart. A series must be added for each of these data sources. The default Stock chart is in black and white. User defined colours will be added at a later stage. EXAMPLE
Here is a complete example that demonstrates most of the available features when creating a Stock chart. #!/usr/bin/perl -w use strict; use Spreadsheet::WriteExcel; my $workbook = Spreadsheet::WriteExcel->new( 'chart_stock_ex.xls' ); my $worksheet = $workbook->add_worksheet(); my $bold = $workbook->add_format( bold => 1 ); my $date_format = $workbook->add_format( num_format => 'dd/mm/yyyy' ); # Add the worksheet data that the charts will refer to. my $headings = [ 'Date', 'Open', 'High', 'Low', 'Close' ]; my @data = ( [ '2009-08-23', 110.75, 113.48, 109.05, 109.40 ], [ '2009-08-24', 111.24, 111.60, 103.57, 104.87 ], [ '2009-08-25', 104.96, 108.00, 103.88, 106.00 ], [ '2009-08-26', 104.95, 107.95, 104.66, 107.91 ], [ '2009-08-27', 108.10, 108.62, 105.69, 106.15 ], ); $worksheet->write( 'A1', $headings, $bold ); my $row = 1; for my $data ( @data ) { $worksheet->write( $row, 0, $data->[0], $date_format ); $worksheet->write( $row, 1, $data->[1] ); $worksheet->write( $row, 2, $data->[2] ); $worksheet->write( $row, 3, $data->[3] ); $worksheet->write( $row, 4, $data->[4] ); $row++; } # Create a new chart object. In this case an embedded chart. my $chart = $workbook->add_chart( type => 'stock', embedded => 1 ); # Add a series for each of the Open-High-Low-Close columns. $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$B$2:$B$6', name => 'Open', ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$C$2:$C$6', name => 'High', ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$D$2:$D$6', name => 'Low', ); $chart->add_series( categories => '=Sheet1!$A$2:$A$6', values => '=Sheet1!$E$2:$E$6', name => 'Close', ); # Add a chart title and some axis labels. $chart->set_title( name => 'Open-High-Low-Close', ); $chart->set_x_axis( name => 'Date', ); $chart->set_y_axis( name => 'Share price', ); # Insert the chart into the worksheet (with an offset). $worksheet->insert_chart( 'F2', $chart, 25, 10 ); __END__ AUTHOR
John McNamara jmcnamara@cpan.org COPYRIGHT
Copyright MM-MMX, John McNamara. All Rights Reserved. This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself. perl v5.10.1 2010-02-02 Spreadsheet::WriteExcel::Chart::Stock(3pm)

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