Changing a value only for the currently selected filter category

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Hi – a question that has some similarities to one asked in the previous post “Addressing cells programmatically”.

I am writing a simple script to replicate an excel-style goal-seek functionality. The script is to work on a matrix with a filter category (‘PhaseName’). The idea is to change the value of a particular item ‘Decline Rate’ (incrementing it up or down), depending on the value returned by the model. Only the value of ‘decline rate’ for the ‘PhaseName’ currently selected in the filter should be changed, however.

I can use the .itemIndex property of the .getFilterItem method to obtain the index number of the currently selected ‘PhaseName’, and can get the particular value for the ‘Decline Rate’ of the currently selected ‘PhaseName’ as follows:

[code:6okzccdn]
int current = |Phase Details|.getFilterItem(|Phase Details::PhaseName|).itemIndex

|Phase Details::Combined Peak.Decline Rate|.values[current].value

[/code:6okzccdn]

However, it appears that using values with an index number in this way is a read-only property – one can’t set this to a new value.

In the earlier post “Addressing cells programmatically”, I found a useful code snippet from dom, achieving something similar by creating an ArrayList based on all of the different values of the item being changed, changing only that value corresponding to the currently selected filter category, and then writing the ArrayList back to the item. In my case, this would work as follows:

[code:6okzccdn]
def ArrayList<Item> declines = |Phase Details::Combined Peak.Decline Rate|.values

declines.set(current, |Phase Details::Combined Peak.Decline Rate|.values[current].value-increment)

|Phase Details::Combined Peak.Decline Rate|.values = declines
[/code:6okzccdn]

This does in fact work – but it seems an inordinately complicated way of doing something that users must surely want to do all the time. Is anyone able to suggest a better way of doing this?

On a related note, since when the model is complete, the filter category “PhaseName” will have several hundred ‘phases’ in it, I have a related question on the model.ensureCalculated() method. With only a few phases, calculation times for this model are generally under a second – so if the goal-seek algorithm I have put together takes 6-10 iterations to find an answer, and must calcuate each time, while it is slow, it is not unbearable. Once several hundered phases have been added to the model, a full recalc will almost certainly take well over 10 seconds, meaning 6-10 iterations will become painfully slow – frustrating since in this case, only one of those several hundred phases actually needs to be calculated. Is there any method that can be called that will calculate the model only for the currently selected phase, rather than for all of them? This would seem like an essential ability for anyone with a large, complex model…

Many thanks.

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Hi Janak,

In theory, you should be able to install 4.0 and 4.1 simultaneously as long as they are in different installation directories. However, the catch is that you won’t be able to open models edited in 4.1 using 4.0. Also, a large number of bugs and missing features in 4.0 were addressed in 4.1 and you may find that some of those issues hamper your efforts almost as much.

It sounds like your calculation issues are non-trivial, but we have some pretty clever people here who would like a chance to at least take a look at the model. Your concerns about confidentiality are completely understandable. I can contact you via e-mail and we can arrange a more secure transfer.

-Ben

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