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How to dynamically define an array

  • Post #1
  • Quote
  • First Post: Edited 4:35pm Jan 22, 2011 3:46pm | Edited 4:35pm
Hi, everyone,

Could anyone tell me how I should correct my following code so that it works? Many thanks!

Inserted Code
extern int NumOfTestBar=100;

int start()
{
   double EMA13[NumOfTestBar];
   ....
}
Arrays have to be declared with fixed sizes as in:

Inserted Code
Double EMA13[9]
They can be dynamically re-sized by using ArrayResize() at some point later in the code. In your case, it would look something like:

Inserted Code
ArrayResize(EMA13, NumOfTestBar);
Many thanks! Should the resized array smaller than the declared size? Or it can be resized to a larger array?

Many thanks!


Quoting CodeMeister
Arrays have to be declared with fixed sizes as in:

Inserted Code
Double EMA13[9]
They can be dynamically re-sized by using ArrayResize() at some point later in the code. In your case, it would look something like:

Inserted Code
ArrayResize(EMA13, NumOfTestBar);
Quoting dogberry
Many thanks! Should the resized array smaller than the declared size? Or it can be resized to a larger array?

Many thanks!
I don't have much experience with it other than seeing it in others code, but I think I remember reading it could be used for both purposes. That makes sense if you need to vary the size according to the amount of data to analyze.
Just leave the size blank :-

Inserted Code
Double EMA13[]
  • Post #6
  • Quote
  • Last Post: Jan 22, 2011 11:56pm Jan 22, 2011 11:56pm
I wrote a little something couple of years back that may be helpful for you in learning Arrays in MQL.

Article: Effective usage of Arrays in MQL

Hope it helps.

regards,
Zen
Programming for a better future.
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