#include?
#include?


//?Zero-phase?digital?filter?with?a?5?order?IIR?filter
void?filtfilt（float?*?b?float?*?a?float?*?rfData?float?*?psData?int?sampLength）
{
	//?Usage...
	//?b?----------?the?numerator?coefficients?of?the?filter
	//?a?----------?the?denominator?coefficients?of?the?filter
	//?rfData?-----?the?input?data
	//?psData?-----?filtered?data
	//?sampLength?-?length?of?the?input?Data?
	
	
	//?Using?digital?filter?coefficients?obtained?from?b?a?=?signal.butter（5?0.5）?in?python
	int?i;
	float?tData;
	//double?*tpData;
	//?Zero?initialization.
	psData[0]?=?+?（?b[0]*rfData[0]?）;

	psData[1]?=?-?（?a[1]*psData[0]?）
		????????+?（?b[0]*rfData[1]?+?b[1]*rfData[0]?）;

	psData[2]?=?-?（?a[1]*psData[1]?+?a[2]*psData[0]?）
		????????+?（?b[0]*rfDat