A different approach would be to use mathcell 
(http://mathcell.tiddlyspot.com/) that emulates spreadsheet-like abilities.

Good luck,
Mark

On Wednesday, August 2, 2017 at 1:05:14 PM UTC-7, Uwe wrote:
>
> Hello dear helpers,
>
> in some tiddlers I have some (< 20) fields with numbers in them, ie 
> {{!!field1}}=2, {{!!field2}}=4 and {{!!field3}}=5 and so on.
>
> I imported $:/plugins/mklauber/math.js 
> <http://mklauber.github.io/tiddly-mathjs/#%24%3A%2Fplugins%2Fmklauber%2Fmath.js>
>  
> from http://mklauber.github.io/tiddly-mathjs/
>
> Using <$calc>, I *cannot *add the sum of these three fields  
> {{!!field4}}=<$calc>{{!!field1}} + {{!!field2}} + {{!!field3}}</$calc> into 
> field4.
> What went wrong?
>
> I need a solution for automatically calculating with the values of my 
> fields (+, -, *, :, percent, average) and to store the result in an other 
> named field. Is there such a solution out there? (Statistical values 
> calculated about all tiddlers with these fields would be great.)
>
> The use case is to calculate the average points of students they got in 
> some tests (and to get the average of all students).
>
> Greetings,
>
> Uwe
>
>
>
>
>
>

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