From: Intransition <transfire@...>
Date: 2012-01-26T03:53:14+09:00
Subject: Re: Microrant on Ruy's Math Skills

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I have tried this, but recently discovered the same issues arise.

To review, instead of:

    (b-d) <= a && (b+d) >= a

We use ratios:

    (a / b - 1).abs <= d

But try 1.1, 1.0 and d=0.1

  (1.1 / 1.0 - 1).abs <= 0.1

and it is false though it should be true b/c 

  (1.1 / 1.0 - 1).abs  #=> 0.10000000000000009

Which is exactly what instigated my micro-rant.

Any advice?


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I have tried this, but recently discovered the same issues arise.<br><br>To review, instead of:<br><br>&nbsp;&nbsp;&nbsp; (b-d) &lt;= a &amp;&amp; (b+d) &gt;= a<br><br>We use ratios:<br><br>&nbsp;&nbsp;&nbsp; (a / b - 1).abs &lt;= d<br><br>But try 1.1, 1.0 and d=0.1<br><br>&nbsp; (1.1 / 1.0 - 1).abs &lt;= 0.1<br><br>and it is false though it should be true b/c <br><br>&nbsp; (1.1 / 1.0 - 1).abs&nbsp; #=&gt; 0.10000000000000009<br><br>Which is exactly what instigated my micro-rant.<br><br>Any advice?<br><br>
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