How to Make Matlab Output Zero Coefficients in f=2x^2+1?

[motherh]

Take f = 2x^2 + 1. When I run coeffs(f) in Matlab it outputs [2,1]. However I want it to output all the zero coefficients as well, for example [2 0 1] here. How do I do that?

 

[eulergy]

Take f = 2x^2 + 1. When I run coeffs(f) in Matlab it outputs [2,1]. However I want it to output all the zero coefficients as well, for example [2 0 1] here. How do I do that?

My first thought would be that you'd need to have f = 2x^2 + 0x + 1 because with what you have f as right now, MATLAB doesn't know that the x coefficient is 0 if it's not explicitly typed.

Then again I'm no expert so there's a good chance I'm wrong, just a thought.

 

[kreil]

Does this have to be done symbolically?

If not you should probably just *start* with f = [2 0 1] and work from there.