MACD vs MACD one bar ago

[Forex Trader]

How do I plot the macd versus the macd one bar ago in metatrader 4?

thanks,

[Forex Trader]

Here is the way I am trying to compare the macd versus the macd of one bar ago. Can anyone comment about the correctness of my code.

Thanks,
jpygbp


//+------------------------------------------------------------------+
//| macd vs macd[1] |
//+------------------------------------------------------------------+

#property link ""
#property indicator_buffers 4
#property indicator_separate_window
#property indicator_color1 Blue
#property indicator_color2 Red
#property indicator_color3 DarkGray
#property indicator_color4 Yellow

//---- buffers
double Buffer1[];
double Buffer2[];
double Buffer3[];
double Buffer4[];

extern int Fast = 12;
extern int Slow = 26;
extern int Signal = 9;


//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
//IndicatorBuffers(4);
SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,2);
SetIndexStyle(1,DRAW_LINE,STYLE_SOLID,2);
SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexStyle(3,DRAW_LINE,STYLE_SOLID,2);

SetIndexBuffer(0,Buffer1);
SetIndexBuffer(1,Buffer2);
SetIndexBuffer(2,Buffer3);
SetIndexBuffer(3,Buffer4);

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//---- TODO: add your code here

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//---- TODO: add your code here

for(int i=Bars;i>=0;i--){
Buffer1[i]=iMACD(NULL,0,Fast,Slow,Signal,PRICE_CLOSE,MODE_MAIN,i);
Buffer2[i]=iMACD(NULL,0,Fast,Slow,Signal,PRICE_CLOSE,MODE_SIGNAL,i);
Buffer3[i]=Buffer1[i] - Buffer2[i];
if (i > 0)
Buffer4[i]=iMACD(NULL,0,Fast,Slow,Signal,PRICE_CLOSE,MODE_MAIN,i-1);
else
Buffer4[i]=iMACD(NULL,0,Fast,Slow,Signal,PRICE_CLOSE,MODE_MAIN,i);
}
//----
return(0);
}
//+------------------------------------------------------------------+