[Jprogramming] Overflow, underflow, floats

[Raul Miller]

I would start by better understanding the specific problem I was
trying to solve.

(As opposed to coming up with a solution and then looking for a
problem that fits to it...)

Thanks,

-- 
Raul


On Thu, Sep 21, 2017 at 9:35 AM, Erling Hellenäs
<erling at erlinghellenas.se> wrote:
> Hi all!
>
> I made a mistake when trying to get an error obviously caused by a platform
> exception.
> Databases are full of fields without data. Doesn't R handle this in a good
> way?
> What is your proposed way of handling this missing data?
> You consider NaNs, positive and negative infinity as unknown values too?
> Would you prefer an error instead of getting these? Or you just look for
> them in the tests and make sure they never happen in production?
>
> /Erling
>
>
> Den 2017-09-21 kl. 14:41, skrev Don Guinn:
>>
>> Did you mean?
>>
>>     1/0
>> |domain error
>> |   1    /0
>> |[-0]
>>     1%0
>> _
>>
>> What made me think of sparse arrays is that it does much of the leg work
>> to
>> identify some number, like zero, to remove. It keeps an index list of
>> elements not removed and has tools to extract only those elements not
>> removed. It's really not what sparse ($.) is intended for, but I thought
>> it
>> might be useful in this case.
>>
>> In my thinking, unknown values should never be put in an array. Having
>> them
>> in an array leads to so many problems, only a few have been mentioned in
>> this thread.
>>
>> If "unknown values" are generated as part of the computation then it seems
>> to me it is time to go back and look at the problem analysis.
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