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2018-08-09 14:17:29 +0200	commented answer	arrange an expression in powers of a variable Thanks! How to access the coefficients of each power? If you noticed, I am trying to use Sage for asymptotic analysis of DE's. Is there any guide/doc for this topic?
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2018-08-08 10:33:57 +0200	asked a question	arrange an expression in powers of a variable I have the following code: `f0 = function('f0')(x) f1 = function('f1')(x) var('ep') y = f0+epf1 de=epdiff(y,x,2)+diff(y,x) expand(de)` which gives the output: `ep^2diff(f1(x), x, x) + epdiff(f0(x), x, x) + epdiff(f1(x), x) + diff(f0(x), x)` How can I rearrange this expression in powers of "ep" parameter? i.e `ep^2diff(f1(x), x, x) + ep*( diff(f0(x), x, x) + diff(f1(x), x) ) + diff(f0(x), x)` Then I want to get the coefficient for each power (which is a differential eq) and then pass it to the desolve.