the mathworks - 1-18gtu why do i get an error in matlab 6_0 (r12) where i got a warning in r11 with reference to uninitialized variables.mht

英国Sheffield大学开发的基于matlab的遗传算法工具箱GATBX

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      <P></P><!--subject_begin-->
      <H3>Subject:</H3>
      <P>Why do I get an error in MATLAB 6.0 (R12) where I got a warning =
in R11=20
      with reference to uninitialized variables? =
</P><!--subject_end--><!--problem description begin-->
      <H3>Problem Description:</H3>
      <P><!--prob_desc_begin-->Why do I get an error in MATLAB 6.0 (R12) =
where I=20
      got a warning in R11 with reference to uninitialized=20
      variables?<BR><BR><CODE>a =3D [a,3];<BR></CODE><BR>In MATLAB 5.3 =
(R11) I=20
      received the following warning:<BR><BR><SAMP =
class=3Derror>Warning:=20
      Reference to uninitialized variable a.<BR></SAMP><BR>In MATLAB 6.0 =
(R12) I=20
      get:<BR><BR><SAMP class=3Derror>??? Undefined function or variable =

      'a'.<BR></SAMP></P><!--problem description end-->
      <P><!--solution_begin-->
      <TABLE>
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          <TD width=3D550>
            <DIV style=3D"LEFT: 0px; WORD-WRAP: break-word">
            <H3>Solution:</H3>
            <P>There are actually three cases to be considered with =
reference to=20
            uninitialized variables in MATLAB.<BR><BR>The first case is =
the one=20
            listed above where is a variable is used on the right hand =
side=20
            before being initialized.<BR><BR><CODE>function before1<BR>a =
=3D=20
            [a,3];<BR></CODE><BR><PRE><BR>MATLAB 5.3 (R11)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before1<BR>Warning: Reference=20
            to uninitialized variable a in before1 at line 2.<BR>&gt; In =

            d:\temp\before1.m at line 2<BR></SAMP><BR><PRE><BR>MATLAB =
6.x (R12.x)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before1<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before1.m<BR>On line 2 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR><PRE><BR>MATLAB 6.5 (R13)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before1<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before1.m<BR>On line 2 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR>The=20
            second case is where a variable is used on the right hand =
side after=20
            it first appeared on the left hand side of an assignment =
which was=20
            not executed. For example:<BR><BR><CODE>function =
before2<BR>if=20
            0<BR>a =3D 1;<BR>end<BR>a =3D =
[a,3];<BR></CODE><BR><PRE><BR>MATLAB 5.3 (R11)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before2<BR>Warning: Reference=20
            to uninitialized variable a in before2 at line 5.<BR>&gt; In =

            d:\temp\before2.m at line 5<BR></SAMP><BR><PRE><BR>MATLAB =
6.x (R12.x)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before2<BR>Warning: Reference=20
            to uninitialized variable a in before2 at line 5.<BR>&gt; In =

            d:\temp\before2.m at line 5<BR></SAMP><BR><PRE><BR>MATLAB =
6.5 (R13)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before2<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before2.m<BR>On line 5 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR>The=20
            third case is called undefined. It occurs when a variable =
first=20
            appears on the right-hand side of an assignment which was =
not yet=20
            executed. For example,<BR><BR><CODE>function before3<BR>if =
0<BR>z =3D=20
            a;<BR>end<BR>a =3D [a,3];<BR></CODE><BR><PRE><BR>MATLAB 5.3 =
(R11)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before3<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before3.m<BR>On line 5 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR><PRE><BR>MATLAB 6.x (R12.x)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before3<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before3.m<BR>On line 5 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR><PRE><BR>MATLAB 6.5 (R13)<BR>
</PRE><BR><SAMP class=3Derror>&gt;&gt; before3<BR>??? Undefined=20
            function or variable 'a'.<BR><BR>Error in =3D=3D&gt;=20
            d:\temp\before3.m<BR>On line 5 =3D=3D&gt; a =3D =
[a,3];<BR></SAMP><BR>The=20
            finalized behavior for this issue is that using an =
uninitialized=20
            variable is always an error.<BR><BR>There are various ways =
to deal=20
            with this new behavior. One alternative is to set the =
variable in=20
            question to empty at the beginning of the M-file. Since=20
            uninitialized variables were implicitly treated as empty =
matrices,=20
            this will preserve the semantics of the program. However, a =
better=20
            second-order fix would be to determine why the variable is =
being=20
            used before being assigned and correct the =
discrepancy.<BR><BR>An=20
            example: <BR><BR><CODE>function out =3D before(in) <BR>% x =
and out are=20
            undefined if in &gt;=3D 0 <BR>if (in &lt; 0)<BR>x =3D -in; =
<BR>out =3D x;=20
            <BR>end <BR>y =3D ones(x); <BR></CODE><BR>Another fix would=20
            be:<BR><BR><CODE>function out =3D before(in)<BR>if (in &lt; =
0)<BR>x =3D=20
            -in;<BR>out =3D x;<BR>else<BR>x =3D in;<BR>if nargout &gt;=20
            0<BR>error('Too many outputs requested for positive value of =

            IN');<BR>end<BR>end<BR>y =3D ones(x);<BR></CODE>
            <P></P></DIV></TD></TR></TBODY></TABLE><!--solution_end-->
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