d3.js - why does one chart not filter another in dc.js? -

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i not able understand how dc groups chart. change in 1 filter reflects in others. have simple code 2 series charts. when draw brush on one, not filter other. not sure why ? can please have quick @ small code , suggest. 

d3.csv("data/comparedata.txt", function(data) {    ndx = crossfilter(data);   rundimension = ndx.dimension(function(d) {return [+d3.time.format.iso.parse(d.timestamp), +d.meterid]; });   frequencygroup = rundimension.group().reducesum(function(d) { return +d.frequency; });   magnitudegroup = rundimension.group().reducesum(function(d) { return +d.magnitude; });    frequencychart     .width(768)     .height(480)     .chart(function(c) { return dc.linechart(c).interpolate('basis'); })     .x(d3.time.scale().domain([1366621166000, 1366621179983]))     .y(d3.scale.linear().domain([90, 100]))     .brushon(true)     .yaxislabel("measured speed km/s")     .xaxislabel("run")     .elasticy(true)     .dimension(rundimension)     .group(frequencygroup)     .mousezoomable(false)     .seriesaccessor(function(d) {return +d.key[1];})     .keyaccessor(function(d) {return +d.key[0];})     .valueaccessor(function(d) {return +d.value;})     .legend(dc.legend().x(350).y(350).itemheight(13).gap(5).horizontal(1).legendwidth(140).itemwidth(70));   frequencychart.yaxis().tickformat(function(d) {return d3.format(',d')(d);});   frequencychart.margins().left += 40;   magnitudechart     .width(768)     .height(480)     .chart(function(c) { return dc.linechart(c).interpolate('basis'); })     .x(d3.time.scale().domain([1366621166000, 1366621179983]))     .y(d3.scale.linear().domain([90, 100]))     .brushon(true)     .yaxislabel("measured speed km/s")     .xaxislabel("run")     .elasticy(true)     .dimension(rundimension)     .group(magnitudegroup)     .mousezoomable(false)     .seriesaccessor(function(d) {return  +d.key[1];})     .keyaccessor(function(d) {return +d.key[0];})     .valueaccessor(function(d) {return +d.value;})     .legend(dc.legend().x(350).y(350).itemheight(13).gap(5).horizontal(1).legendwidth(140).itemwidth(70));   magnitudechart.yaxis().tickformat(function(d) {return d3.format(',d')(d);});   magnitudechart.margins().left += 40;        dc.renderall();  });

you using same dimension group on both charts.

a grouping intersects crossfilter's current filters, except associated dimension's filter. thus, group methods consider records satisfy every filter except dimension's filter. so, if crossfilter of payments filtered type , total, group total observes filter type.

from crossfilter api doc

one solution create rundimension2 similar rundimension , second chart using dimension instead.


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