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<body><span class="vcard"><a class="email" href="mailto:sgougeon@free.fr" title="Samuel GOUGEON <sgougeon@free.fr>"> <span class="fn">Samuel GOUGEON</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - An GOOD compatibility bug :~))) Should be mentioned in Help/Doc Matlab (code"
href="http://bugzilla.scilab.org/show_bug.cgi?id=6729">bug 6729</a>
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---------- Bug Summary ----------- <br>An GOOD compatibility bug :~))) Should be mentioned in Help/Doc Matlab (code <br><br>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">URL</td>
<td>no error message
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<td style="text-align:right;">Assignee</td>
<td>vincent.couvert@scilab-enterprises.com
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<td>bugzilla.admin@scilab.org
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - An GOOD compatibility bug :~))) Should be mentioned in Help/Doc Matlab (code"
href="http://bugzilla.scilab.org/show_bug.cgi?id=6729#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - An GOOD compatibility bug :~))) Should be mentioned in Help/Doc Matlab (code"
href="http://bugzilla.scilab.org/show_bug.cgi?id=6729">bug 6729</a>
from <span class="vcard"><a class="email" href="mailto:sgougeon@free.fr" title="Samuel GOUGEON <sgougeon@free.fr>"> <span class="fn">Samuel GOUGEON</span></a>
</span></b>
<pre>(In reply to Vincent COUVERT from <a href="show_bug.cgi?id=6729#c1">comment #1</a>)
<span class="quote">> I'm not sure it is an associativity problem:
> - First example: (int16(1)+0.4)+0.4 is equivalent to (int16(1)+int16(0.4))+int16(0.4) ==> (int16(1) + 0) + 0 ==> 1
> - Second example: int16(1)+(0.4+0.4) is equivalent to int16(1)+int16(0.4+0.4) ==> int16(1) + int16(0.8) ==> 2</span >
Which version were you commenting: The Matlab or Scilab one?
In Octave 4.2.1, we still get:
<span class="quote">>(int16(1)+0.4)+0.4 returns 1, but
>int16(1)+(0.4+0.4) returns 2 (In Matlab addition is not associative!)</span >
The difference between Scilab and Octave is that Scilab int() decimal numbers when casting them into encoded integers:
--> int8(-1.2)
ans =
-1
--> int8(1.2)
ans =
1
While Octave rounds them:
<span class="quote">>> int8(-1.6)</span >
ans = -2
<span class="quote">>> int8(-1.5)</span >
ans = -2
<span class="quote">>> int8(-1.4999)</span >
ans = -1
<span class="quote">>> int8(1.4999)</span >
ans = 1
<span class="quote">>> int8(1.6)</span >
ans = 2
The status of Matlab versus Octave should be checked before fixing mtlb_int#() implementations</pre>
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