Hi Nathan,
I am pretty sure the let filter operator from Tobias [1] will help you
out there. There are even some examples for calclulating averages [2].
/Andreas
[1] http://let.tiddlyspot.com
[2] http://let.tiddlyspot.com/#AVG
Am 06.03.2015 um 18:29 schrieb nathan.mcel...@gmail.com:
I've read over several posts regarding using some javascript macros to
manipulate fields as numerical values, but I haven't found an answer
to whether or not the following is possible:
I'm working on a wiki to publicly display results of water sample
analyses for a project. I create a tiddler for each sample, and each
tiddler has a number of custom fields (i.e., site ID, pH, total
dissolved solids, ppm chloride, etc.). Now, I've figured out a way to
create tables that brings in data from all tiddlers of a specific tag
(e.g., site ID, sample date, chemical parameter) and each time I add a
new sample, the table tiddlers automatically add that information.
Example of table:
''Summary of Field Data for Gaut Pad Site G-01 to Date''
<table>
@@.center
<tr><th>Year</th><th>Qtr</th><th>Date</th><th>Collector(s)</th><th>Time</th><th>pH</th><th>TDS
(ppm)</th><th>Cond. (μS)</th><th>Temp. °C</th><th
align="left">Comments</th></tr>
*<$list filter="[tag[Gaut]tag[G01]!tag[summary]sort[02a-yr]sort[03-qt]]">*
<tr><td>{{!!02a-yr}}</td><td>{{!!03-qt}}</td><td>{{!!02-yr}}/{{!!04a-mmdd}}</td><td>{{!!06-who}}</td><td>{{!!05-hr}}</td><td>_*{{!!08-ph}}*_</td><td>{{!!09-ftds}}</td><td>{{!!10-con}}</td><td>{{!!11-tem}}</td><td
align="left">{{!!07-note}}</td></tr>
</$list>
would like to then add a row where averages of each column could be
displayed (e.g., from each {{!!08-pH}} value from /n/ tiddlers tagged G01)
@@
</table>
What I want to find out here is ... during the $list call that
populates my table, is there a way (using Tiddly or javascript macro)
to set up a variable that will store information of a particular field
and do something with it.
Specifically, for a table that contains pH values, etc. for a host of
sample sites, is there a way as the list is sorted, to grab each pH
value and when the list is over, take those values and create an
average value that I can display at the bottom of the table?
I'm slowly learning JavaScript but have done lots of Python
programming ... I just don't know if it's possible to do this, and if
so, how do I grab/store individual values from the $list? to
manipulate them after </$list>
Thanks for reading.
Nate McElroy
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