Taking LCM in a polynomial expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg95328] Taking LCM in a polynomial expression*From*: Srikanth <skt at xdtech.com>*Date*: Thu, 15 Jan 2009 06:13:57 -0500 (EST)

Hi I have a symbolic matrix that I invert. When I take each individual entry of the resulting matrix, I get an expression of the form: num1/den1 + num2/den1 + .... + num_n/den1 where den1 is the determinant of the matrix. I'd like to get an expression of the form: Num/Den. I tried using Simplify (as well as multiplying the matrix by its determinant), but it doesn't seem to help. Any suggestions? On a related note, the final Num is a polynomial in two variables - say x,y. I'd like to arrange it in decreasing powers of x - like f1(y) x^n + f2(y) x^n-1... + constant. What function should use? Is there any way to both in a single step? Thanks a lot Srikanth