Linpack is a benchmark program with a long history; this little app moves it to the iPhone.
I am not aware of any app that actually uses this type of math on a smartphone; most smartphone applications, even if they analyze huge sets of data, don't attempt the advanced statistical insights it could give. (That is, IF it worked against real data and reported any result other than how accurately it solved the linpack problem. This is JUST for benchmarking!)
I've used the math on desktop machines for an aggressive stat approach to investing, and the math has useful applications in almost all science, but a phone, especially due to its casual use patterns, is an unlikely home for these types of in-depth studies.
In that sense, Linpack is useful for getting a rough notion of the iPhone's power on math-intensive work and almost nothing else. I found it useful to compare to the old PCs that I used for my work (almost a hundred times faster!) or against other smartphones (similar to other what I see quoted for other ARM chips at similar clock speeds).
Maybe the developer will suggest other uses, or show how clever programming could speed up the direct way of solving the problem, but I've been happy with just this.
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