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here we wish to find the rate of change of the function f(X)
with respect to distance moved l in a particular
direction S from a point Xi
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differentiating f(X) with respect to l we get
where xij is the jth component in the
ithiteration of X. But
where xij and sij are the jth
component in the ith iteration of X and
S
Hence
To find the minimum equate the above equation to zero