J. M. is back.
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 21h comment Absurd solution by LinearSolve It's not what you're thinking; otherwise you'd know that Interpolation[] is a built-in function. 21h revised Pollard's Rho algorithm edited tags 21h awarded Nice Answer 1d comment Fit a polynomial/curve to an NIntegrate result ...and you've looked at FindFit[]? 1d revised How to disable the small pop-up windows when mouse is over a Mathematica command in V10? edited tags 1d revised What methods does Maximize use like $\mathtt{Maximize}\left[\left\{3 x^2+2 \sqrt{2} x y,x^4+y^4=1\right\},\{x,y\}\right]$ edited body; edited tags; edited title 1d comment Is there a good way to check, whether a small value produced numerically is a symbolic zero? "constant terms of the characteristic polynomial." - that would just be (up to sign) the determinant, no? 1d revised Why Chop does not make the real part of machine complex numbers an exact zero? edited tags 1d comment Why Chop does not make the real part of machine complex numbers an exact zero? Ponder on the result of Complex[0, 2.]. 1d comment Plot a function for different parameters FWIW, the docs for Plot[] mention the use of Table[] also... 1d comment How do I determine the 15th Lucas term in the 3rd order? Can you not add the code in plain text? This would make people more likely to help you. 1d comment Plot a function for different parameters You've seen Table[]? 1d revised Is there a good way to check, whether a small value produced numerically is a symbolic zero? edited tags 1d comment Is there a good way to check, whether a small value produced numerically is a symbolic zero? What does NullSpace[] return for your matrix? 1d revised Autoregressive Process Question edited tags 1d comment Map a function of several arguments For the second, look up MapThread[]. 1d comment Attempting to use NDSolve to plot harmonic oscillator solutions …and that, folks, is why we try not to touch the code in questions asking for debugging assistance. 1d comment Attempting to use NDSolve to plot harmonic oscillator solutions The code in your question has three arguments (list of equations, dependent variable, iterator), doesn't it? If you're getting that error, then that wasn't what you exactly entered. 1d comment Attempting to use NDSolve to plot harmonic oscillator solutions Use == instead of = in your initial conditions. Clear everything first before doing this. 1d revised Hessian of function at many points edited tags