MQL4 Reference 
Timeseries access iHighest
| int iHighest( |
string symbol, int timeframe, int type, int count=WHOLE_ARRAY, int start=0) |
Returns the shift of the maximum value over a specific number of periods depending on type.
Parameters:
| symbol |
- |
Symbol the data of which should be used to calculate indicator. NULL means the current symbol. |
| timeframe |
- |
Timeframe. It can be any of Timeframe enumeration values. 0 means the current chart timeframe. |
| type |
- |
Series array identifier. It can be any of the Series array identifier enumeration values. |
| count |
- |
Number of periods (in direction from the start bar to the back one) on which the calculation is carried out. |
| start |
- |
Shift showing the bar, relative to the current bar, that the data should be taken from. |
Sample:
double val;
// calculating the highest value on the 20 consequtive bars in the range
// from the 4th to the 23rd index inclusive on the current chart
val=High[iHighest(NULL,0,MODE_HIGH,20,4)];
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