For polynomial A, the function collect(A,v) will return a polynomial equal to A, but with coefficients of like powers of v collected.  

If the parameter v is omitted, then v is taken to be the default symbol given by findsym(A,1).

If A is an array, then collect(A,v) will return an array M with the same dimensions of A. For each element a of A, the corresponding element in M will have the value collect(a,v).

$\mathrm{with}\left(\mathrm{MTM}\right)\:$

$f≔a\ln \left(x\right)-\ln \left(x\right)x-x$

$f≔a\ln \left(x\right)-\ln \left(x\right)x-x$

$\mathrm{collect}\left(f\,\ln \left(x\right)\right)$

$\left(a-x\right)\ln \left(x\right)-x$

$\mathrm{with}\left(\mathrm{MTM}\right)\:$

$g≔\mathrm{int}\left(x^2\left(\exp \left(x\right)+\exp \left(-x\right)\right)\,x\right)$

$g≔-\frac{x^2}{{\ⅇ}^x}-\frac{2x}{{\ⅇ}^x}-\frac{2}{{\ⅇ}^x}+x^2{\ⅇ}^x-2x{\ⅇ}^x+2{\ⅇ}^x$

$h≔\mathrm{int}\left(x^3\left(\exp \left(x\right)+\exp \left(-x\right)\right)\,x\right)$

$h≔-\frac{x^3}{{\ⅇ}^x}-\frac{3x^2}{{\ⅇ}^x}-\frac{6x}{{\ⅇ}^x}-\frac{6}{{\ⅇ}^x}+x^3{\ⅇ}^x-3x^2{\ⅇ}^x+6x{\ⅇ}^x-6{\ⅇ}^x$

$A≔\mathrm{Vector}\left(\left[g\,h\right]\right)$

$A≔\left[\begin{array}{c}-\frac{x^2}{{\ⅇ}^x}-\frac{2x}{{\ⅇ}^x}-\frac{2}{{\ⅇ}^x}+x^2{\ⅇ}^x-2x{\ⅇ}^x+2{\ⅇ}^x\\ -\frac{x^3}{{\ⅇ}^x}-\frac{3x^2}{{\ⅇ}^x}-\frac{6x}{{\ⅇ}^x}-\frac{6}{{\ⅇ}^x}+x^3{\ⅇ}^x-3x^2{\ⅇ}^x+6x{\ⅇ}^x-6{\ⅇ}^x\end{array}\right]$

$\mathrm{collect}\left(A\,\exp \left(x\right)\right)$

$\left[\begin{array}{c}\left(x^2-2x+2\right){\ⅇ}^x+\frac{-x^2-2x-2}{{\ⅇ}^x}\\ \left(x^3-3x^2+6x-6\right){\ⅇ}^x+\frac{-x^3-3x^2-6x-6}{{\ⅇ}^x}\end{array}\right]$