[cells-devel] Re: Cells: How to later set a formula for a cell ?

[Frank Goenninger]

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Am 03.04.2006 um 22:10 schrieb Ken Tilton:

> Goenninger, Frank wrote:
>
>> Hi Kenny,
>>
>> currently heavily playing wit Celtk...
>>
>> I have up to now only set a cell's formula by using directly  
>> (c? ...)  with default-initargs. Now I am stopped cold by the fact  
>> that I have  to be able to set the formula by some setf form. How  
>> to do that in a  conforming way ?
>
>
> Download KR from the Garnet system, they have a million backdoors  
> like that. :)

Don't get me tempted... You risk loosing a real Cells adict ;-)

>
> What's the big picture on this? Maybe there is a way to do it  
> without an alley-oop.

I certainly hope there is!

The big picture - and I begin wondering if phrased my original  
question as misleading  - is that I have laaarge code fragments being  
complex rules for a cell formula. I want to stick that in a separate  
function in order to code in a more readable way ?! When trying to  
achieve this I figured that c? does not much but I simply found that  
I need the context of the cell slot to stick some rule to it.

Second use case:

Imagine I have a knowledge base (using inference) that produces cell  
formulae based on facts and rules I have put into the knowledge base.  
So, I have to be able to act on lists of structure ( cell-id formula- 
form ) and stick those new formula-forms into the given cells with id  
cell-id.

> If you sell me on the need, and you can at least start the slot as  
> c-input, I imagine there is some way to do this.

Is the above enough ?

>
> If you do not sell me on the need, I will still give you some  
> pointers* on how to mess up the beauty of Cells yourself.:) But I  
> think you will still need to start with a c-input, or you will lose  
> the dependencies (Cells does not record dependencies on slots not  
> mediated by Cells.)
>
> ken (going out for groceries soon)
>
> * Look at c-install, md-awaken, c-awaken-cell, and their neighbors.

Looking, even staring at them ?!

Cheers
    Frank



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