I disagree that this answer is "wrong". If you want a mathematically correct 
answer you are going to have to obtain it by applying intelligence to the 
algorithm in which this calculation occurred. This is not a mailing list about 
numerical methods in general, so it probably isn't appropriate to pursue that 
conversation here.
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Sent from my phone. Please excuse my brevity.

CHEL HEE LEE <[email protected]> wrote:

>I have some trouble to deal the value of 'NaN'.  For example, 
>
>> exp(1e3)
>[1] Inf
>> exp(1e3)*0
>[1] NaN
>
>The correct answer should be 0 rather than NaN.  I will very appreciate
>if anyone can share some technique to get a correct answer.
>
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>PLEASE do read the posting guide
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>and provide commented, minimal, self-contained, reproducible code.

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