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asec in Matlab |
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asec
Inverse secant; result in radians Syntax Y = asec(X) Description Y = asec(X) returns the inverse secant (arcsecant) for each element of X. The asec function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians. Examples Graph the inverse secant over the domains 1<=x<=5 and -5<=x<=1. x1 = -5:0.01:-1; x2 = 1:0.01:5; plot(x1,asec(x1),x2,asec(x2)), grid on Definition The inverse secant can be defined as sec^(-1)(z)=cos^(-1)(1./z) Algorithm asec uses FDLIBM, which was developed at SunSoft, a Sun Microsystems, Inc. business, by Kwok C. Ng, and others. For information about FDLIBM, see http://www.netlib.org. See Also asecd, asech, sec Add by Pancho You can edit it here |
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| Frog Killer Caught in the Act
A killer has been caught in the act: the first before-and-after view of an infectious disease that led to an amphibian die-off has been released by the scientists who tracked it. The results are published this week in the journal Proceedings of the National Academy of Sciences (PNAS). Like a wave, incidence of the fungal disease that wipes out Central American frogs--chytridiomycosis--advances through the region's highlands at a rate of about 30 kilometers ...
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