On 27 March 2016 at 23:10, hiskennyness <[email protected]> wrote:
>
> On Saturday, March 26, 2016 at 8:53:24 PM UTC-4, James Reeves wrote:
>>
>> Have you considered modelling this as a functional problem first?
>>
>
> Well. I was doing that in Cells 0.1... Worked great but quickly failed on
> scalability as formula depended on formula so we quickly moved to caching
> calculated values and then a scheme to know when the cache was obolete.
>
Isn't that just a data structure problem?
I mean, I guess you'd have a function to update the data structure you're
keeping the cells in:
(set-cell cells :x 2) => cells'
So you know which cell is being directly updated, and if you use a
dependency <https://github.com/stuartsierra/dependency> graph, you can
quickly work out all the dependent cells as well. Then you recalculate all
the cells with formulae that are dependent upon the cell being updated.
- James
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