How to apply an indicator on top of an indicator?

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When I am writing the code for an expert advisor, how do I apply an indicator on the data generated by another indicator? for example, putting bollinger bands on RSI. because in the iBands functions, you need to put the symbol name. Any help is greatly appreciated.
Bollinger Bands ®
Bollinger Bands ®
  • votes: 14
  • 2010.01.26
  • MetaQuotes Software Corp.
  • www.mql5.com
The Bollinger Bands ® Indicator (BB) is similar to Envelopes. The only difference is that the bands of Envelopes are plotted a fixed distance (%) away from the moving average, while the Bollinger Bands are plotted a certain number of standard deviations away from it.
 
1mathboy1:
When I am writing the code for an expert advisor, how do I apply an indicator on the data generated by another indicator? for example, putting bollinger bands on RSI. because in the iBands functions, you need to put the symbol name. Any help is greatly appreciated.
Read this, maybe that help you.
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