19 lines
310 B
Fortran
19 lines
310 B
Fortran
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!符号函数
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real*8 function FUNC_sign(A)
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implicit none
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real*8 :: A
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if(isnan(A)) then
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FUNC_sign = A
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elseif(A>0) then
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FUNC_sign = 1.0
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elseif(A<0) then
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FUNC_sign = -1.0
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elseif(A==0) then
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FUNC_sign = 0.0
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end if
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end function
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