matlab atan2
atan2
四象限反正切
P = atan2(Y,X)>> atan2(4,-3)
ans =
2.2143
>>
>> atan2(-5,-5)*180.0/3.1415926
ans =
-135.0000
>>
#######################
四象限反正切
P = atan2(Y,X)>> atan2(4,-3)
ans =
2.2143
>>
>> atan2(-5,-5)*180.0/3.1415926
ans =
-135.0000
>>
#######################