HMC5883磁力计使用前必须进行校准，这个matlab程序用来拟合磁力计的数值，然后得出补偿值-HMC5883 magnetometer must be calibrated before use, the procedure used to fit the numerical matlab magnetometer, and then come to the compensation value

能够对hmc5883三轴磁力数据进行非线性拟合，输出拟合后的数据，完成磁力计的校准(The hmc5883 three axis magnetic data can be nonlinear fitted, and the output data can be adjusted to accomplish the calibration of magnetometer)