Many Web applications need to execute periodic
tasks. Some operating systems come with
programs, like cron or at, to execute scheduled
tasks. However, under some Web hosting
environments these programs cannot be used.
Virtual Cron provides an alternative solution that
can be used in more restricted hosting
environments. It uses files to keep track of the last
time when a periodical task was executed. The site
Web page scripts can use the class to check these
files. The class can tell when it is time to execute a
task again. When it is time, the same script can
execute the scheduled task without depending on
external programs.
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Ump is a program in which all sorts of
calculations can be done, from the simplest to the
more advanced. It handles complex numbers and
matrices of those. The complex numbers are built
up by either floating point values or ratios of
arbitrary sized integers. Ump also draws graphs,
ordinary, polar, and parameter, which is done
through an easy to use user interface. It's also
possible to write your own functions using the
built in editor.
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MoioChart is my Java library to draw function plots,
bar graphs, pie graphs, etc. It can work with
Swing, SWT, and SuperWaba.
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