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Maplesoft Document System Tue, 09 Jun 2026 14:10:24 GMT Tue, 09 Jun 2026 14:10:24 GMT The latest answers and comments added to the Question, How to not further convert to list when only contain one variable http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/143828-How-To-Not-Further-Convert-To-List-When http://www.mapleprimes.com/questions/143828-How-To-Not-Further-Convert-To-List-When?ref=Feed:MaplePrimes:How to not further convert to list when only contain one variable:Comments#answer143843 <p>To avoid unintended conversion of monomials, you can check if the expression is of type <strong>`+`</strong>.<strong> <br></strong></p> <p>Example:</p> <form name="worksheet_form"> <table style="width: 480px;" align="center"> <tbody> <tr> <td> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">p:= randpoly([x,y,z]);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/f6579c8374da853cebbed7eb49ecee41.gif" alt="-62*x^2*z^3+97*x*y^3*z-73*y*z^4-56*x*y*z^2+87*x*y" width="334" height="27"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">evalb(p::`+`);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/d2e397bb0066167a0ab2646203144b1d.gif" alt="true" width="30" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">`if`(p::`+`, nops, 1)(p);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/165e5135c02868ff968103f659b6fa8d.gif" alt="5" width="13" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">L:= `if`(p::`+`, [op], `[]`)(p);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a64e89326422f6425eed695ee0a2a80d.gif" alt="[-62*x^2*z^3, 97*x*y^3*z, -73*y*z^4, -56*x*y*z^2, 87*x*y]" width="320" height="27"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">tL:= indets ~ (L);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a8033bc97f0a467e9240d703b72a8082.gif" alt="[{x, z}, {x, y, z}, {y, z}, {x, y, z}, {x, y}]" width="278" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">nL:= nops ~ (tL);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a69d0eeab4a0d30667231beb26924611.gif" alt="[2, 3, 2, 3, 2]" width="123" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">[seq]({seq}(v=degree(L[k],v), v= tL[k]), k= 1..nops(L));</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -23;" src="/view.aspx?sf=143843/454587/fe9e0f2fa9ac190a442b1d2f03284b72.gif" alt="[{x = 2, z = 3}, {x = 1, y = 3, z = 1}, {y = 1, z = 4}, {x = 1, y = 1, z = 2}, {x = 1, y = 1}]" width="480" height="40" align="middle"></p> </td> </tr> </tbody> </table> <input type="hidden" name="sequence" value="1"> <input type="hidden" name="cmd" value="none"></form> <p>&nbsp;</p> <p><a href="/view.aspx?sf=143843/454587/poly.mw">Download poly.mw</a></p> <p>To avoid unintended conversion of monomials, you can check if the expression is of type <strong>`+`</strong>.<strong> <br></strong></p> <p>Example:</p> <form name="worksheet_form"> <table style="width: 480px;" align="center"> <tbody> <tr> <td> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">p:= randpoly([x,y,z]);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/f6579c8374da853cebbed7eb49ecee41.gif" alt="-62*x^2*z^3+97*x*y^3*z-73*y*z^4-56*x*y*z^2+87*x*y" width="334" height="27"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">evalb(p::`+`);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/d2e397bb0066167a0ab2646203144b1d.gif" alt="true" width="30" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">`if`(p::`+`, nops, 1)(p);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/165e5135c02868ff968103f659b6fa8d.gif" alt="5" width="13" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">L:= `if`(p::`+`, [op], `[]`)(p);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a64e89326422f6425eed695ee0a2a80d.gif" alt="[-62*x^2*z^3, 97*x*y^3*z, -73*y*z^4, -56*x*y*z^2, 87*x*y]" width="320" height="27"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">tL:= indets ~ (L);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a8033bc97f0a467e9240d703b72a8082.gif" alt="[{x, z}, {x, y, z}, {y, z}, {x, y, z}, {x, y}]" width="278" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">nL:= nops ~ (tL);</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -6;" src="/view.aspx?sf=143843/454587/a69d0eeab4a0d30667231beb26924611.gif" alt="[2, 3, 2, 3, 2]" width="123" height="23"></p> <table style="margin-left: 0px; margin-right: 0px;"> <tbody> <tr valign="baseline"> <td><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;"> &gt;&nbsp;</span></td> <td> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="left"><span style="color: #78000e; font-size: 100%; font-family: Courier New,monospace; font-weight: bold; font-style: normal;">[seq]({seq}(v=degree(L[k],v), v= tL[k]), k= 1..nops(L));</span></p> </td> </tr> </tbody> </table> <p style="margin: 0 0 0 0; padding-top: 0px; padding-bottom: 0px;" align="center"><img style="vertical-align: -23;" src="/view.aspx?sf=143843/454587/fe9e0f2fa9ac190a442b1d2f03284b72.gif" alt="[{x = 2, z = 3}, {x = 1, y = 3, z = 1}, {y = 1, z = 4}, {x = 1, y = 1, z = 2}, {x = 1, y = 1}]" width="480" height="40" align="middle"></p> </td> </tr> </tbody> </table> <input type="hidden" name="sequence" value="1"> <input type="hidden" name="cmd" value="none"></form> <p>&nbsp;</p> <p><a href="/view.aspx?sf=143843/454587/poly.mw">Download poly.mw</a></p> 143843 Sun, 24 Feb 2013 18:29:29 Z Carl Love Carl Love http://www.mapleprimes.com/questions/143828-How-To-Not-Further-Convert-To-List-When?ref=Feed:MaplePrimes:How to not further convert to list when only contain one variable:Comments#comment143895 <p>Great skill</p> <p>Great skill</p> 143895 Mon, 25 Feb 2013 19:22:56 Z williamov williamov