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acos in Matlab |
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acos
Inverse cosine; result in radians Syntax Y = acos(X) Description Y = acos(X) returns the inverse cosine (arccosine) for each element of X. For real elements of X in the domain [-1,1], acos(X) is real and in the range [0,pi]. For real elements of X outside the domain [-1,1], acos(X) is complex. The acos function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians. Examples Graph the inverse cosine function over the domain -1<=x<=1. x = -1:.05:1; plot(x,acos(x)), grid on 3_*__________________ ____*________________ ______*______________ ________*____________ __________*__________ ____________*_______ _____________*_______ ______________*______ 0_______________*____ -1________________*__1 Definition The inverse cosine can be defined as cos^(-1)(z)=-i*log(z+i(1-z^2)^(1./2)) Algorithm acos 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 acosd, acosh, cos Add by Pancho You can edit it here |
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