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What is shasta?

Mount Shasta is a 4317--meter somewhat active volcano in Northern California. Its snow--capped multiple--crater summit, pictured above, is a well-known california landmark as well as a ski resort. This page describes however shasta, an interactive interface to the Sum^it library that provides some efficient computations revolving around operators and systems in Q[n,E] or Q(n)[E] where E is the shift operator that sends n to n+1. In fact, the main goal of shasta is to provide access to selected functionalities of the Sum^it library to other computer algebra systems, or to users who do not own an Aldor compiler, or who feel more confortable with interactive access to a library. The functionalities currently provided by shasta are the ones that tend to be missing from several commercial computer algebra systems, namely: If you do not need any of the above computations, then you probably will not have much use for shasta. Otherwise, since shasta provides implementations of several recent algorithms for those computations, it is worth giving it a try.

What is the current version?

The current distributed version is 1.0.0, released September 4, 2002.

How do I get shasta?

You must download first the platform-independent part by clicking here, then download the executable for the operating system(s) and platform(s) you need:

How do I install shasta?

Issue tar -xvzf shasta.tar.gz to install the platform-independent parts. The executables can be installed anywhere. More installation details are in the README file and in the on-line documentation

Are there other Sum^it servers?

Yes, if you are interested in linear ordinary differential equations, you can take a look at the Bernina server, that provides similar functionalities for those equations.
Last update: 28 October 2002