formula values default to zero

I want to graph a range that is automatically updated, but
the range consists of formulae that do not have values
yet. I am doing a line chart, so I do not want these
values represented as zero, instead I would like to
essentially have them blank. For example, January and
February have values but the other months don't - how do I
graph or change the formulae to keep the other months from
showing up as zero on the graph.

I tried nested functions with "" as the False value, but
still get a zero value plotted on the graph.

Please help, I'm going nuts trying to figure this out.

Thanks

Look at dynamic chart example on my sie
www.stfx.ca/people/bliengme/ExcelTips.
Or in the empty cells type =NA()
Best wishes
Bernard
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"Roger" wrote in message
...
I want to graph a range that is automatically updated, but
the range consists of formulae that do not have values
yet. I am doing a line chart, so I do not want these
values represented as zero, instead I would like to
essentially have them blank. For example, January and
February have values but the other months don't - how do I
graph or change the formulae to keep the other months from
showing up as zero on the graph.

I tried nested functions with "" as the False value, but
still get a zero value plotted on the graph.

Please help, I'm going nuts trying to figure this out.

Thanks

use NA() instead of 0

"Roger" wrote in message
...
I want to graph a range that is automatically updated, but
the range consists of formulae that do not have values
yet. I am doing a line chart, so I do not want these
values represented as zero, instead I would like to
essentially have them blank. For example, January and
February have values but the other months don't - how do I
graph or change the formulae to keep the other months from
showing up as zero on the graph.

I tried nested functions with "" as the False value, but
still get a zero value plotted on the graph.

Please help, I'm going nuts trying to figure this out.

Thanks