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Estimates the sum of an alternating series. Three linear methods for convergence acceleration are implemented.EXAMPLES:% log(2) = 1 - 1/2 + 1/3 - 1/4 + ...altsum(1./(1:20))ans = 0.693147180559945 % pi = 4 - 4/3 + 4/5 - 4/7 +...
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