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NaN Problem Adding Numbers from NSTableView

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NaN Problem Adding Numbers from NSTableView

Subject: NaN Problem Adding Numbers from NSTableView
From: Philip Juel Borges <email@hidden>
Date: Wed, 21 Apr 2010 16:53:29 +0200

Hi,

I've googled this issue to no avail until now. In my application I have a tableview with 6 columns to enter numbers for statistic purposes. That works fine. Yet, I've run into a problem adding the numbers together. Under each column below the tableview I have placed an NSLabel to show the total amount. I bind that label under Value in the bindings panel like so:

Bind To: myArrayController
Controller Key: arrangedObjects
Model Key Path: email@hidden

But some times I need to leave a tableview cell blank and then it writes NaN in the label. If I type in 0 (zero) it adds up the numbers nicely. But I'd rather just leave the selection empty rather than typing in a zero.

Any ideas how to solve the NaN issue?

--Philip
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