CORDIC算法快速求反正切，迭代10次输出弧度误差<|0.002|,迭代15次输出弧度误差<|0.0001|,对电机矢量算法计算速度要求高非常有用；myarctan_cordic1.c输入输出为float,myarctan_cordic3.c输入输出为int，pdf文件为CORDIC算法原理。-CORDIC algorithm quickly find tangent, curvature of the output error iteration 10 < | 0.002 |, iterate 15 times the output arc error < | 0.0001 |, of the motor vector algorithm for high speed is very useful　myarctan_cordic1.c input and output for the float, myarctan_cordic3.c input and output for the int, pdf file for the CORDIC algorithm works.