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Posted: **Wed Apr 20, 2011 6:42 am**

Could someone explain what the problem is with this code:

%sample_string = @str({%date_project_begin}) + " " + _
                 @str({%date_project_bbox_end})
scalar mean_inventory_change = @mean(dbbinv, %sample_string)

As far as I can see

Code: Select all

%sample_string

is inserting two years and a space enclosed by quotations (i.e. "2010 2021"), which is what I think the coding should specify.

Posted: **Wed Apr 20, 2011 9:03 am**

The manual is somewhat misleading on this. The @mean function only accepts a sample string if you are assigning into a series. If you are assigning into a scalar or a matrix, you can not include a sample string. Yes this is odd.

The simplest work around is to set the workfile sample before calculating the mean:

Code: Select all


%sample_string = @str({%date_project_begin}) + " " + @str({%date_project_bbox_end})
smpl {%sample_string}
scalar mean_inventory_change = @mean(dbbinv)
smpl @all

Posted: **Wed Apr 20, 2011 10:38 am**

OK thanks!

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Inserting sample string in @mean

Inserting sample string in @mean

Re: Inserting sample string in @mean

Re: Inserting sample string in @mean