Custom Report > simply divide by 2

Drunal42 andreas_pinter at inode.at
Sun Jan 10 10:53:06 EST 2016


This is probably the dumbest question ever, but I'm not able to divde a given
value by two. 

I took the cash-flow report and added another option there, which should
basically do the following:
If the flag is set, divide the "incoming" by two. 

I managed to add the option
I managed to read the option
I managed to create my own commodity-collector
And I managed that it will be used instead of the money-in-collector from
the standard report if the flag is set. 

But for the sake of god I'm not able to fill my own commodity-collector with
half of what the money-in-collector contains. 
I tried 
(mycollector 'add report-currency (/ s-report-value 2))
or
(mycollector 'add report-currency (gnc-numeric-div s-report-value 2))
or
(mycollector 'add report-currency (gnc-number-div s-report-value
(gnc-numberic-create 2 100)))

where it originally said
(money-in-collector 'add report-currency s-report value)

all of the above give me an error in gnucash. 
It is really just a simple modification I need and I do not plan to create
any additional / more complex reports. Therefore I have not setup any
meaningful development environment yet. I assume it is simply a typing issue
with the s-report-value being one type and 2 something else (I thought it
should be a gnc-numeric as far as I understood it)

Alternatively I tried to get the gnc-numeric value from the
money-in-collector and then divide it by 2 before adding it to my own
collector: 
(set! temp (gnc:sum-collector-commodity money-in-collector report-currency
exchange-fn))
(set! temp(gnc:gnc-monetary-amount temp))
;; divide by two here, somehow.
(mycollector 'add report-currency temp)

Any help is appreciated. 



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