http://www.mapleprimes.com/questions/102989-Substituting-Variables-Into-Matricies en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Thu, 11 Jun 2026 19:22:31 GMT Thu, 11 Jun 2026 19:22:31 GMT The latest answers and comments added to the Question, Substituting Variables into Matricies http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/102989-Substituting-Variables-Into-Matricies http://www.mapleprimes.com/questions/102989-Substituting-Variables-Into-Matricies?ref=Feed:MaplePrimes:Substituting Variables into Matricies:Comments#answer102990 <p>You are using a <strong>matrix</strong>, not a <strong>Matrix</strong>.&nbsp; The former is an older data structure.&nbsp; You can substitute into a matrix, but you have to eval it:</p> <pre>subs(a = 1, eval(A));</pre> <p>You could also do</p> <pre>eval(A, [a=1, b=2]);</pre> <p>However, you probably want to use a Matrix. Also, rather than <strong>linalg</strong> (which does use the matrix type), you should consider using <strong>LinearAlgebra</strong>, which uses the Matrix type.</p> <p>You are using a <strong>matrix</strong>, not a <strong>Matrix</strong>.&nbsp; The former is an older data structure.&nbsp; You can substitute into a matrix, but you have to eval it:</p> <pre>subs(a = 1, eval(A));</pre> <p>You could also do</p> <pre>eval(A, [a=1, b=2]);</pre> <p>However, you probably want to use a Matrix. Also, rather than <strong>linalg</strong> (which does use the matrix type), you should consider using <strong>LinearAlgebra</strong>, which uses the Matrix type.</p> 102990 Fri, 25 Mar 2011 21:09:46 Z Joe Riel Joe Riel