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祈晴娃娃11銅蟲(chóng) (初入文壇)
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[求助]
fortran 復(fù)變函數(shù)的輻角主值的命令是什么啊? 已有1人參與
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| 求指點(diǎn),一時(shí)查不到,有熟悉的人嗎?多謝! |
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金蟲(chóng) (正式寫(xiě)手)
銅蟲(chóng) (初入文壇)
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7.17 ATAN2 — Arctangent function Description: ATAN2(Y,X) computes the arctangent of the complex number X + i Y. Option: f95, gnu Class: elemental function Syntax: X = ATAN2(Y,X) Arguments: Y The type shall be REAL(*). X The type and kind type parameter shall be the same as Y. If Y is zero, then X must be nonzero. Return value: The return value has the same type and kind type parameter as Y. It is the principle value of the complex number X + i Y. If X is nonzero, then it lies in the range -\pi \le \arccos (x) \leq \pi. The sign is positive if Y is positive. If Y is zero, then the return value is zero if X is positive and \pi if X is negative. Finally, if X is zero, then the magnitude of the result is \pi/2. Example: program test_atan2 real(4) :: x = 1.e0_4, y = 0.5e0_4 x = atan2(y,x) end program test_atan2 Specific names: Name Argument Return type Option DATAN2(X) REAL(8) X REAL(8) f95, gnu 你的CARG應(yīng)該是別的庫(kù)里的,你得自己找出問(wèn)題在哪哦。 用atan2試試吧f95標(biāo)準(zhǔn)函數(shù) |
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