# Questions tagged [coefficients]

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### Comparison of Coefficients involving complex exponentials

I'm trying to solve a couple (independently) of equations of the following type $a_0 x + 3 a_1 y(1 + xe^{i3q} + e^{-iq + 2ip}) + ... = 0, \forall x, y, q, p$. Using SolveAlways doesn't work well. So ...
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### LogicalExpand to find coefficients in power series

I am attempting to use the LogicalExpand command to find an equation for each coefficient in a power series. The documentation gives the following example of this usage: ...
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### Collecting coefficient list of arbitrary polynomial

Say I have a polynomial like: 1+x^(n)+3x^(n+1)+3nx^(3n+4) I want to extract the coefficient list {1,1,3,3n}. I've been toying ...
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### Series coefficient not working for abstract powers

I'm trying to extract coefficients of some complicated polynomials. If I try to write SeriesCoefficient[1/(x-1)^4,{x,0,m}], this works fine, everything as expected. ...
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### Dft to evaluate Fourier coefficients

Use the DFT to evaluate the N Fourier coefficients cs of fp(t), derived by sampling the following periodic functions: (a) fp(t) = cos^2(t) and (b) fp(t) with unit cell φ(t) = rect(t) and period ∆t = 3....
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### How to find expansion coefficients in Fourier-Legendre

I am trying to find the coefficients for the Fourier-Legendre expansion of a potential. My goal was to obtain the coefficients as expressions in terms of x and y. I followed the example given on the ...
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### How to join the lhs and rhs of the rows of a matrix equation and solve for one of the variables?

The matrix equation m.{x,y}==b results in an awkward disjointed looking presentation but correct construction of a system of linear equations ...
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