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Overall, PSEs create a framework that is all things to all people: they solve simple or complex problems, support rapid prototyping or detailed analysis, and can be used in introductory education or at the frontiers of science."
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PSEs can be traced to the 1963 proposal of Culler and Fried for an "Online Computer Center for Scientific Problems".
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Important examples of PSEs are:
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Matlab, which has been a popular commercial system in the linear algebra and signal processing fields.
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Khoros is another well-known PSE in the latter field.
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Purdue also produced a high level interface PDElab to solving 2D and 3D partial differential equations.
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The current set of PSEs are built around observation that Yahoo is a "PSE for the World's Information"
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