is double precision float point supported in Labview 2012

[saketa]

Hi,

  when i used Xilinx COREGEN Float point multiplier (which is supposed to support double float point precision), and try to creat control on 1 operand only SGL appear,  

  is double precision float point supported within Labview 2012.?

 Regards,

SA

[GerdW]

Hi saketa,

LabVIEW supports DBL as long as I can think of.

But you seem to ask for the FPGA module (while not saying so): this one only supports SGL…

You might want to read this white paper!

[saketa]

Hi,

  Thank you.

  i think that SGL can support real number like 230.54458884 

 am i right?

 Thanks

SA

[crossrulz]

LabVIEW FPGA only supports Single Precision Floating Points.  But be sure to put this in as a suggestion in the LabVIEW FPGA Idea Exchange.

[GerdW]

Hi saketa,

no, you're wrong.

SGL has limited precision and will change your number to 230.5445861816406 when you try to input it in a control/constant…

[saketa]

Hi GerdW,

 I do not perfectly understand your answer,

so it increase the precision from   230.544588 to 230.5445861816406

Regards,

SA

[GerdW]

Hi saketa,

no I only increased the number of visible digits. That's completely different from precision…

Create a SGL control/constant in LabVIEW. Type in your number. Change number of visible digits in the control properties to 17+. See what happens…

[Yamaeda]

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@saketa wrote:

Hi,

  Thank you.

  i think that SGL can support real number like 230.54458884 

 am i right?

 Thanks

SA

---

Almost, a SGL has 7 decimals precision, so the ending ...84 will be ...8.

/Y

[GerdW]

Hi Yamaeda,

you need to count all digits of mantissa regardless of exponent, so the cut will be after "45"…

Btw. SGL only has 6.9 decimal digits! 😄

[Yamaeda]

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@GerdW wrote:

Hi Yamaeda,

you need to count all digits of mantissa regardless of exponent, so the cut will be after "45"…

---

Right, forgot about that. 🙂

My point was ofcourse that a SGL supports a real, as he asked for, but with limited precision.

/Y