Darn, I thought the automation would be simple, but I have an weird error I
can't figure out. The code below, in which the for loop automates what is
then commented out, doesn't work. If I bring the comment into play to
replace the automation however, I can go on to group the data to complete
the pivot and draw a table or chart fine. But as far as I can see, the
'columns' array from either implementation is identical to the other. Any
ideas?
var columns = [0];
var columnNames = data.getDistinctValues(2);
for (var i=0; i<columnNames.length; i++) {
name = columnNames[i];
columns.push({type:'number', label: name, calc: function (data, row)
{return (data.getValue(row, 1) == name) ? data.getValue(row, 2) : null;}});
}
/*
var columns = [0,
{type: 'number', label: 'Arg', calc: function (data, row) {return
(data.getValue(row, 1) == 'Arg') ? data.getValue(row, 2) : null;}},
{type: 'number', label: 'Bol', calc: function (data, row) {return
(data.getValue(row, 1) == 'Bol') ? data.getValue(row, 2) : null;}},
{type: 'number', label: 'Chi', calc: function (data, row) {return
(data.getValue(row, 1) == 'Chi') ? data.getValue(row, 2) : null;}}
]
*/
var view = new google.visualization.DataView(year_country_grouping);
view.setColumns(columns);
Thanks again,
Iain
On Friday, November 16, 2012 12:07:13 PM UTC, Iain wrote:
>
> Nice - I've written an implementation of that that works - now I just have
> to figure out how to automate it as I won't know what the data will be -
> some form of loop through the distinct values of the given column I expect.
>
> Any experience of the performance of this pivot function for real data
> sets?
>
> Thanks for your help, really appreciated.
> Iain
>
> On Thursday, November 15, 2012 8:25:52 PM UTC, asgallant wrote:
>>
>> You need to pivot your data, so you end up with one data series for each
>> country. There isn't any support for pivots in the API, but I wrote a hack
>> that shows you how to do a pivot manually:
>> http://jsfiddle.net/asgallant/HkjDe/
>>
>> On Thursday, November 15, 2012 1:45:18 PM UTC-5, Iain wrote:
>>>
>>> Hi, hoping to get some help with DataViews. My ultimate goal is to draw
>>> Pie Charts and Column Charts form one DataTable - my understanding is that
>>> I can create different DataViews from that DataTable to support this.
>>>
>>> I've created a DataTable with columns 'KGs', 'Year', 'Country', and
>>> 'Material'. I was able to create a pie chart that aggregated each
>>> country's KG's by year using the following code:
>>>
>>> var by_year = google.visualization.data.group(dt, [1], [{'column': 0,
>>> 'aggregation': google.visualization.data.sum, 'type': 'number'}]);
>>> var chart = new
>>> google.visualization.PieChart(document.getElementById('chart_year'));
>>> chart.draw(by_year, options);
>>>
>>> I then wanted to create a Column Chart with KGs on the y-axis, Year on
>>> the x-axis and Country in the Legend. I grouped the data as follows:
>>>
>>> var by_year_country = google.visualization.data.group(dt, [1,2],
>>> [{'column': 0, 'aggregation': google.visualization.data.sum, 'type':
>>> 'number'}]);
>>>
>>> Then I tried to tell the API what was data and what was grouping with
>>> the following code, which produced a Column Chart but one in which the
>>> x-axis repeats the year for every country, and the legend has just one
>>> entry with no label:
>>>
>>> var view = new google.visualization.DataView(by_year_country);
>>> view.setColumns([
>>> {sourceColumn:0, type:'string', role:'domain', label:'Year'},
>>> {sourceColumn:1, type:'string', role:'domain', label:'Country'},
>>> {sourceColumn:2, type:'number', role:'data'}
>>> ]);
>>> chart.draw(view, options);
>>>
>>> Can anyone provide any advice on how this is supposed to be implemented,
>>> or the appropriate terminology upon which to seek an answer?
>>>
>>> Many thanks in advance,
>>> Iain
>>>
>>
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