<b>Number.</b> (name: <span class="tt wims_code_words">numeric</span>)<br>
Comparison of real numbers up to the precision
defined by the author
.<p>
Precision can be fixed in the field
<span class="tt wims_code_words">precision</span>,
by default 1000.
The error is by default relative : the difference between the correct answer and the
reply should be less in absolute value than
<span class="tt">M(prec)</span>
where
<div class="wimscenter">
!insmath M
(prec
)= \frac
{max(|\mbox
{reply
}|+|\mbox
{goodreply
}|,\frac
{1}{\mbox
{prec
}})}{\mbox
{prec
}} </div>
(replace
<span
class="tt">precision
</span
> by
<span
class="tt">sqrt(precision
)</span
> for a correct answer up to precision).
</p>
:option
<p>
If the word <span class="tt wims_code_words">comma</span> is in the option,
real numbers can be written with
a comma instead of the decimal point (but the correct answer must be with a
decimal point). In this case, if the answer is correct, the correct answer is written
with the same "decimal point" as the one of the student.
</p>
<p>
If the word <span class="tt wims_code_words">absolute</span> is in the option, the precision is absolute.
The answer is then correct up to precision if the difference is less than 10/precision.
</p>
:example
!distribute items good,bad,poor precision into name_good,name_bad,name_prec
!set name_header=Answer,Relative <br> precision,Absolute <br>précision <br>, Difference <br>with
!set example=0.42,0.4205,0.4192,0.4191,0.4190,0.4,0.39,500000
!set nb_ex=!itemcnt $example
!set precision=1000
!read help/anstype/table_numeric.phtml
!set example=505.42,505.4205,505.4192,505.4191,505.4190,505.4,505.39
!set nb_ex=!itemcnt $example
!set precision=1000
!read help/anstype/table_numeric.phtml