Set value to a custom significance. (no display)

[Joris Spekreijse]

Hello,

I am trying to set my values in a specific significance. Format() is not a
good solution, it is still fixed in a predefined length. I want my values to
be stored (into memory) let's say with a significance of 2. Octave should do
then the following:

:> a = 0.499 / 2
a = 0.25

:> a * 2
a = 0.5

and not

:> a * 2
a = 0.49900 (assuming that format is set to short)

Is there a way to do this in Octave?
I tried something with
:> a = 0.499;
:> clear b; 
:> b = printf("%0.2f", a);
0.50b = 4

b has then the value of 4.
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