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Re: Comparison operators and floating-point errors [message #70553 is a reply to message #70552]

Mon, 19 April 2010 14:45

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Apr 19, 6:24 pm, Ed Hyer <ejh...@gmail.com> wrote:
> On Apr 19, 1:36 pm, Craig Markwardt <craig.markwa...@gmail.com> wrote:
>
>> Right. Try setting NAN=0.0/0.0 or NAN=!values.f_nan.
>
> OK, so for the purpose of masking an array with a binary mask, I had
> been using
>
> MASKED_DATA = DATA / FLOAT(MASK)
>
> and should instead use
>
> MASKED_DATA = (DATA * MASK) / FLOAT(MASK)
>
> in order to ensure that the masked values are all NaN.

Or

w=where(~mask,nw)
if (nw gt 0) then masked_data[w]=!values.d_nan

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[Message index]

		Re: Comparison operators and floating-point errors By: R.G.Stockwell on Mon, 19 April 2010 15:23
		Re: Comparison operators and floating-point errors By: penteado on Mon, 19 April 2010 14:45
		Re: Comparison operators and floating-point errors By: MarioIncandenza on Mon, 19 April 2010 14:24
		Re: Comparison operators and floating-point errors By: Craig Markwardt on Mon, 19 April 2010 13:36
		Re: Comparison operators and floating-point errors By: penteado on Mon, 19 April 2010 12:18

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