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1、FORTRAN90標(biāo)準(zhǔn)庫函數(shù)2009-07-2908:27符號(hào)約定：lI代表整型;R代表實(shí)型;C代表復(fù)型;CH代表字符型;S代表字符串;L代表邏輯型;A代表數(shù)組;P代表指針;T代表派生類型;AT為任意類型。ls:P表示s類型為P類型(任意kind值)。s:P(k)表示s類型為P類型(kind值=k)。l[…]表示可選參數(shù)。l*表示常用函數(shù)。表1數(shù)值和類型轉(zhuǎn)換函數(shù)函數(shù)名說明ABS(x)*求x的絕對(duì)值∣x∣。x:I、R,結(jié)果類型同x;x:C,結(jié)果:RAIMAG(x)求x的實(shí)部。x:C,結(jié)果:RAINT(x[,kind])*對(duì)x取整,并轉(zhuǎn)換為
2、實(shí)數(shù)(kind)。x:R,kind:I,結(jié)果:R(kind)AMAX0(x1,x2,x3,…)*求x1,x2,x3,…中最大值。xI:I,結(jié)果:RAMIN0(x1,x2,x3,…)*求x1,x2,x3,…中最小值。xI:I,結(jié)果:RANINT(x[,kind])*對(duì)x四舍五入取整,并轉(zhuǎn)換為實(shí)數(shù)(kind)。x:R,kind:I,結(jié)果:R(kind)CEILING(x)*求大于等于x的最小整數(shù)。x:R,結(jié)果:ICMPLX(x[,y][,kind]))將參數(shù)轉(zhuǎn)換為x、(x,0.0)或(x,y)。x:I、R、C,y:I、R,kind:I,結(jié)果
3、:C(kind)CONJG(x)求x的共軛復(fù)數(shù)。x:C,結(jié)果:CDBLE(x)*將x轉(zhuǎn)換為雙精度實(shí)數(shù)。x:I、R、C,結(jié)果:R(8)DCMPLX(x[,y])將參數(shù)轉(zhuǎn)換為x、(x,0.0)或(x,y)。x:I、R、C,y:I、R,結(jié)果:C(8)DFLOAT(x)將x轉(zhuǎn)換為雙精度實(shí)數(shù)。x:I,結(jié)果:R(8)DIM(x,y)*求x-y和0中最大值,即MAX(x-y,0)。x:I、R,y的類型同x,結(jié)果類型同xDPROD(x,y)求x和y的乘積,并轉(zhuǎn)換為雙精度實(shí)數(shù)。x:R,y:R,結(jié)果:R(8)FLOAT(x)*將x轉(zhuǎn)換為單精度實(shí)數(shù)。x:I,
4、結(jié)果:RFLOOR(x)*求小于等于x的最大整數(shù)。x:R,結(jié)果:IIFIX(x)*將x轉(zhuǎn)換為整數(shù)(取整)。x:R,結(jié)果:IIMAG(x)同AIMAG(x)INT(x[,kind])*將x轉(zhuǎn)換為整數(shù)(取整)。x:I、R、C,kind:I,結(jié)果:I(kind)LOGICAL(x[,kind])*按kind值轉(zhuǎn)換新邏輯值。x:L,結(jié)果:L(kind)MAX(x1,x2,x3,…)*求x1,x2,x3,…中最大值。xI為任意類型,結(jié)果類型同xIMAX1(x1,x2,x3,…)*求x1,x2,x3,…中最大值(取整)。xI:R,結(jié)果:IMIN(x
5、1,x2,x3,…)*求x1,x2,x3,…中最小值。xI為任意類型,結(jié)果類型同xIMIN1(x1,x2,x3,…)*求x1,x2,x3…中最小值(取整)。xI:R,結(jié)果:IMOD(x,y)*求x/y的余數(shù),值為x-INT(x/y)*y。x:I、R,y的類型同x,結(jié)果類型同xMODULO(x,y)求x/y余數(shù),值為x-FLOOR(x/y)*y。x:I、R,y的類型同x,結(jié)果類型同xNINT(x[,kind])*將x轉(zhuǎn)換為整數(shù)(四舍五入)。x:R,kind:I,結(jié)果:I(kind)REAL(x[,kind])*將x轉(zhuǎn)換為實(shí)數(shù)。x:I、R、
6、C,kind:I,結(jié)果:R(kind)SIGN(x,y)*求x的絕對(duì)值乘以y的符號(hào)。x:I、R,y的類型同x,結(jié)果類型同xSNGL(x)將雙精度實(shí)數(shù)轉(zhuǎn)換為單精度實(shí)數(shù)。x:R(8),結(jié)果:RZEXT(x)用0向左側(cè)擴(kuò)展x。x:I、L,結(jié)果:I表2三角函數(shù)函數(shù)名說明ACOS(x)*求x的反余弦arccos(x)。x:R,結(jié)果類型同x,結(jié)果值域:0~πACOSD(x)*求x的反余弦arccos(x)。x:R,結(jié)果類型同x,結(jié)果值域:0~180°ASIN(x)*求x的反正弦arcsin(x)。x:R,結(jié)果類型同x,結(jié)果為弧度,值域:0~πASI
7、ND(x)*求x的反正弦arcsin(x)。x:R,結(jié)果類型同x,結(jié)果為度,值域:0~180°ATAN(x)*求x的反正切arctg(x)。x:R,結(jié)果類型同x,結(jié)果為弧度,值域:-π/2~π/2ATAND(x)*求x的反正切arctg(x)。x:R,結(jié)果類型同x,結(jié)果為度,值域:-90~90°ATAN2(y,x)求x的反正切arctg(y/x)。y:R,x和結(jié)果類型同x,結(jié)果值域:-π~πATAN2D(y,x)求x的反正切arctg(y/x)。y:R,x和結(jié)果類型同x,結(jié)果值域:-180~180°COS(x)*求x的余弦cos(x)。
8、x:R、C,x取值弧度,結(jié)果類型同xCOSD(x)*求x的余弦cos(x)。x:R,x取值度,結(jié)果類型同xCOSH(x)求x的雙曲余弦ch(x)。x:R,結(jié)果類型同xCOTAN(x)*求x的余切ctg(x)
