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converting floats to doubles [message #44106]

Fri, 20 May 2005 12:14

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

Hi computation gurus,

is dblarr(n) equivalent in precision to double(fltarr(n))? I know that
in a case like sqrt(dblarr(n)) vs. double(sqrt(fltarr(n))), they are not
equivalent (the second version is not true double precision). But I
thought when I start with whole numbers anyway, it might be the case.

In other words, when a floating point number is converted to double, are
the additional digits always set to zero, or is it possible that they
aren't? I tried it out by printing some numbers, and it looks like they
add only zeroes, but I would be happy if the experts could confirm.

Thanks for any insight,

Benjamin

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