Mathematica: Delete constant term of f(z,w)

[jackmell]

Hi,

I have a messy expression as a polynomial in z and w:

a+bz+czw+dz^2w+...+kz^n w^m

How can I delete the constant "a" term?

Here's the function. The constant terms are dispersed throughout the expression. I know I can extract the coefficient list first in w then in z to actually get the constant expression but I don't know how to remove it from the expression:

Edit: Ok, that was dumb. Just use Coefficient to get at it then just subtract it out. Sorry. Can't delete it. Nevermind.

 

[NateD]

To delete the constant term, you can use the Coefficient command to extract it from the polynomial. Then, subtract it from the expression. For example, if the polynomial is: a+bz+czw+dz^2w+...+kz^n w^mYou can use the Coefficient command like this:coefficient[a+bz+czw+dz^2w+...+kz^n w^m,z^0,w^0]which would return "a", the constant term. Then you can subtract it from the expression by doing: a+bz+czw+dz^2w+...+kz^n w^m - aThis should delete the constant term from the expression.