Hi Alex,
> Do you think it would be worth creating a calcs tiddler with common calcs,
> such as squared, percent?
>
I think it would make sense to have topic-specific tiddlers wherever those
computed values are necessary. So, I don't think I'd want a generic "calcs"
tiddler, or know what to put in it and why.
1) Perhaps you'd rather want macros using the eval widget, but calculating
simple or sophisticated things in a parametric manner, e.g.:
\define ++(val) <$eval>{{$val$}}+1</$eval>
<<++ !!myfield>>
2) Also, what works quite well, and I didn't know it would, is to further
calculate with a field containing a computation.
So, let's say we take your field from the last example:
kcal-carbs: <$eval>{{Carbo-needs!!kcal-per-day}}*{{Carbo-needs!!carbs-
percent}}/100</$eval>
You can simply keep calculating with it:
<$eval>{{Carbo-needs!!kcal-carbs}}*2</$eval>
3) A third method would be to use templates, e.g.
title: $://total-price
<$eval>({{!!price}} + {{!!shipping}}) * (1+{{$:/finance/tax-rates!!vat}}/100
)</$eval>
And then:
title: Basket
total: {{||$://total-price}}
So, there's three ways to leverage the eval *widget*.
1. macros
2. fields containing the widget
3. templates
Best wishes,
Tobias.
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