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The NI Idea Exchange is a product feedback forum where NI R&D and users work together to submit ideas, collaborate on their development, and vote for the ones they like best. View all of the NI Idea Exchanges to post an idea or add your opinion on an existing one today!
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Wolfgang

'+' sign in numeric controls

Status: Under Consideration
by Active Participant Wolfgang on ‎11-01-2010 03:06 AM

As suggested about two years ago (http://forums.ni.com/t5/LabWindows-CVI/Is-it-possible-to-have-an-explicit-sign-in-numeric-controls/m...) I am still looking for a possibility to explicitly show the positive sign of a numeric value in numeric controls, i.e. the control should display '+6.789' instead of '6.789'.

 

Phrased differently I would like to have one more attribute 'SHOW_POSITIVE_SIGN' that could be set to

 

0: don't show the plus sign, i.e. display numbers as is implemented now, default

1: show plus sign for positive numbers

2: show plus sign for positive numbers and zero

 

 

Status: Under Consideration
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Comments
by Active Participant menchar ‎11-06-2010 02:36 PM - edited ‎11-06-2010 02:37 PM
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And while Wolfgang's on the topic,  how about allowing a default value of "not a number" (NaN) for numeric controls with a floating point type?

 

NaN is specific to the IEEE flt pt spec but I is CVI supported on any non IEEE flt pt platform?

 

NaN is very good for indicating a "no measurement" or impossible measurement value without using some additional context to let the user know he / she's not looking at a good value.

 

In the old days we used 'funny numbers" (e.g. a negative value for time, power" to flag this, but NaN is perfect for it.

 

Without the control NaN default, you have to be sure and hack it in at startup or whenever you default the control, something of a needless hassle.

 

And if NaN works, then how about +Infinity, -Infinity and some of the other non-numeric values supported by IEEE flt pt?

 

It would be nice if NI would more fully incorporate IEEE flt pt into CVI.  After all, it's hard to find a CVI app that doesn't use flt pt.

by Active Participant LuisG on ‎12-13-2010 11:03 PM
Options
Status changed to: In Development
 
by Active Participant Laura F. on ‎12-16-2010 08:44 AM
Options
Status changed to: New
prior status deleted, setting to default
by Active Participant LuisG on ‎12-17-2010 11:38 AM
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Status changed to: Under Consideration
 
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