COMSOL中的函数表达.doc

Mathematical Functions TABLE 3-4: MATHEMATICAL FUNCTIONSFUNCTIONDESCRIPTIONSYNTAX EXAMPLEabsAbsolute valueabs(x)acosInverse cosine (in radians)acos(x)acoshInverse hyperbolic cosine (in radians)acosh(x)acotInverse cotangent (in radians)acot(x)acothInverse hyperbolic cotangent (in radians)acoth(x)acscInverse cosecant (in radians)acsc(x)acschInverse hyperbolic cosecant (in radians)acsch(x)argPhase angle (in radians)arg(x)asecInverse secant (in radians)asec(x)asechInverse hyperbolic secant (in radians)asech(x)asinInverse sine (in radians)asin(x)asinhInverse hyperbolic sine (in radians)asinh(x)atanInverse tangent (in radians)atan(x)atan2Four-quadrant inverse tangent (in radians)atan2(y,x)atanhInverse hyperbolic tangent (in radians)atanh(x)besseljBessel function of the first kindbesselj(a,x)besselyBessel function of the second kindbessely(a,x)besseliModified Bessel function of the first kindbesseli(a,x)besselkModified Bessel function of the second kindbesselk(a,x)ceilRound up to nearest integerceil(x)conjComplex conjugateconj(x)cosCosinecos(x)coshHyperbolic cosinecosh(x)cotCotangentcot(x)cothHyperbolic cotangentcoth(x)cscCosecantcsc(x)cschHyperbolic cosecantcsch(x)epsFloating point relative accuracyepserfError functionerf(x)expExponentialexp(x)floorRound down to nearest integerfloor(x)gammaGamma functiongamma(x)i, jImaginary unitiimagImaginary partimag(u)infInfinityinflogNatural logarithmlog(x)log10Common logarithm (base 10)log10(x)log2Base-2 logarithmlog2(x)maxMaximum of two argumentsmax(a,b)minMinimum of two argumentsmin(a,b)modModulo operatormod(a,b)NaN, nanNot-a-numbernanpiPipipsiPsi function and its derivativespsi(x,k)rangeCreate a range of numbersrange(a,step,b)realReal partreal(u)roundRound to closest integerround(x)secSecantsec(x)sechHyperbolic secantsech(x)signSignum functionsign(u)sinSinesin