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Displaying large variance of values in bar chart [message #1059659]

Tue, 21 May 2013 06:51

Sachin Garg

Messages: 10
Registered: May 2013

Junior Member

Hi,

I have a large variance of data values to be plotted in a bar graph like some entries are only of KB's while others are in GB's. So when these values are shown in the bar graph, bars of lower values don't show up properly.
So, is there any way to skip some of the values in the Y axis to resolve the problem.

I have also go through the following post:
broken axis birt in birt-exchange.

which recommends to draw 2 charts but actually the gap between the 2 charts is very large, which don't fulfills the requirement.

Thanks in advance

Thanks a lot,
Sachin

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Re: Displaying large variance of values in bar chart [message #1059864 is a reply to message #1059659]

Wed, 22 May 2013 03:00

Michael Williams

Messages: 1925
Registered: July 2009

Senior Member

You could do a study chart:

BIRT Exchange DevShare - Study Chart

Michael

Developer Evangelist, Silanis

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Re: Displaying large variance of values in bar chart [message #1059933 is a reply to message #1059864]

Wed, 22 May 2013 08:37

Sachin Garg

Messages: 10
Registered: May 2013

Junior Member

In case of study charts, there are 2 series in Y axis, but I am having only 1 series in Y axis having lot of variance of data.

The problem is that when showing large variance of data in bar chart, bars having small values are of very small size. How to get those bar size up so that they can also be visible.

I have tried to use logarithmic scale but this doesn't meet the requirement as it is difficult to identify the gap between low and high values in logarithmic scale.

Would it be feasible in BIRT to show some break in the graph so that low values are also visible as in the image attached

index.php/fa/15004/0/

Attachment: axisbreak.png
(Size: 4.81KB, Downloaded 1388 times)

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Re: Displaying large variance of values in bar chart [message #1059954 is a reply to message #1059933]

Wed, 22 May 2013 10:39

4040 4040

Messages: 78
Registered: February 2013

Member

No Message Body

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Re: Displaying large variance of values in bar chart [message #1060083 is a reply to message #1059954]

Thu, 23 May 2013 02:44

Michael Williams

Messages: 1925
Registered: July 2009

Senior Member

This is what you could force with a study chart. You'd just use the same series twice and then set the scale of each chart to only show the tops of the bars for the tall bars and the lower half scaled back for the short bars. It would be similar to the two chart method you saw on BIRT Exchange.

Michael

Developer Evangelist, Silanis

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