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Tutorial 121 | Introduction to the Dictionary class

Store, check and update information in a Dictionary object

The Dictionary Class defines the structure of an object as a collection of key/value pairs that let you save values for use by a single EasyLanguage analysis techniques (indicator, paintbar study, showme study etc) or strategy. The structure is similar to a real dictionary where the word that we are searching the meaning for is the key and the definition of the word is the value.

Using Dictionary objects to store data is relatively straightforward and, arguably, more efficient with computer resources. A potential disadvantages is that, whereas with Arrays you can query what the value was for a particular element of an array a number of bars ago, you cannot do this with a dictionary.

Summary of tutorial 121

In this tutorial we look for high pivots on a chart. Each time a high pivot is confirmed we plot a dot on the pivot and add pivot information to a dictionary. As the key we use the bar number (converted to a string) and for the value we use the price of the pivot. At the close of each bar we check if the high of that bar is greater than any of the pivot values stored in the dictionary. If so, the pivot key/value pair are be deleted from the dictionary. Finally we do another plot of all the pivots that remain in the array at the time that the program was first applied to a chart.

Programming lessons

The tutorial demonstrates how to:

  • Create a dictionary and vector
  • Add a key/value pair to the dictionary
  • Delete a key/value pair from the dictionary
  • Use a for loop to go through the dictionary
  • Copy to keys into a key vector and copy the values into a values vector
  • Count the number of elements in the dictionary
  • Avoid ‘Vector is empty or invalid index’ errors

[download_box]If you wish to save yourself some time typing in the code, the UNPROTECTED TradeStation showme study (_Tutorial121) containing tutorial program (i.e. the TradeStation EasyLanguage is fully functional and you can see the source code) is available for IMMEDIATE download for $19.95- by clicking the ‘add to cart’ button. The program works with TradeStation but not with Multicharts.

The code is available free to Gold Pass members (see below).

After download the programs can be opened, you will be able to see the program code and modify it if you wish.

After purchase you will be redirected to a download page, so don’t close the browser.[/download_box]

 Video explanation of tutorial 121

 Video explanation of tutorial 121 – a typical error

Gold Pass area

This content is for members only.

[download_box]If you wish to save yourself some time typing in the code, the UNPROTECTED TradeStation indicator (_Tutorial121) containing tutorial program (i.e. the TradeStation EasyLanguage is fully functional and you can see the source code) is available for IMMEDIATE download for $19.95- by clicking the ‘add to cart’ button. The program works with TradeStation but not with Multicharts.

The code is available free to Gold Pass members (see above).

After download the programs can be opened, you will be able to see the program code and modify it if you wish.

After purchase you will be redirected to a download page, so don’t close the browser.[/download_box]

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