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top n on bar chart
Wrap the expression within a Ranked If statement for example IF(Rank(expression)<11,expression) this should give you top 10 numbers for example providing this is what you were after.
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top n on bar chart
You have this option under chart properties->dimension Limits.
is that what your after?
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top n on bar chart
The Dimension Limits are only available on QlikView 11.
In case you have a previous version you can always Sort the bar chart in the way you wish (e.g. with and Expression... Sum(Sales)) and then limit the number of values that the X axis is showing (under the Presentation Tab).
Don't forget to uncheck the X-Axis scrollbar