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DanielKeep/gist:580365

Created September 15, 2010 07:25
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"
Function to compute DPI from diagonal screen length
and pixel dimensions.
Written in MathEval: http://github.com/DanielKeep/MathEval
"
let dpi(phD, pxW, pxH) = pxW / (phD / sqrt((pxH/pxW)**2 + 1))
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