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5.20 is quite old at this point.
The feature being asked about became part of AB with 5.23.0 Beta.
We are now up to 5.29.6 Beta.
A few comments:
Whenever code contains a feature newer than the version you are running, choices are:
1. upgrade to a newer beta which implements the feature
2. comment out the code lines which use the unrecognized syntax
3. wait for the next non-beta release
I've listed the options in my own order of preference. Desirable new features continue to be added to AB at a nice rate. Modern AB is a far more capable product than AB 5.20.
How many people are really trying to make it as traders with only a single machine? I recommend to keep your "stable" release version on one machine and install Beta version(s) on a different machine(s).
BTW, if you are stuck with one machine, the caveats associated with "Beta" software (have backups, etc.) always apply to any software upgrade, whether it is designated "Beta" or not.
I'll also add that if you don't participate in the Beta process, giving any needed feedback based on the code YOU run, then the ultimate "release" version could still fail to be compatible with that code.
All in all, I think there is much to be gained by participation in the future rather than clinging to the past.
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CHANGES FOR VERSION 5.23.0 (as compared to 5.22.0)
* AFL: SetOption("ExtraColumnsLocation", col) - this new option allows the user to change the location of custom columns added during backtest/optimization
"extra" columns mean:
a) any custom metrics added using custom backtester
b) any optimization parameters defined using Optimize() function
If both custom metrics and optimization parameters are present then custom metrics appear first then optimization parameters
This function is provided to allow the user to change the default "at the end" location of custom columns/optimization parameters.
For example
SetOption("ExtraColumnsLocation", 1 );
will cause that custom metrics and opt params will be subsequently added starting from column 1 (as opposed to last column default)
Note that this setting changes "visual" order of columns, not really in-memory order or export order, so exported data files or copy/paste format do not change.
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