concave function

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concave function

[′kän‚kāv ′fəŋk·shən]
(mathematics)
A function f (x) is said to be concave over the interval a,b if for any three points x1, x2, x3 such that a <>x1<>x2<>x3<>b, f (x2)≥ L (x2), where L (x) is the equation of the straight line passing through the points [x1, f (x1)] and [x3, f (x3)].
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However, at present some limitations exist to applying the ROS analyses to data from subjects with hemiplegia: our ability to compute meaningful radii and arc lengths is compromised for flat shapes and concave-down shapes (leading to the exclusion of three subjects from this study).