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| Maybe ListCorrelate can do what you require? |
| Since you already went to Technical Support, this is a situation where you could probably ask about it here without the moderators removing it. (If it turns out to be a simple misunderstanding then it may well get removed, but not before an... |
| Unfortunately I cannot replicate those spikes using version 13.2 or 14.0 on Ubuntu Linux. It might be platform dependent. |
| We'll look into it. |
| We take a derivative after that. Will the logs be off by something other than a constant in the variable `phi`? |
| Interesting method I guess. It is different from the one I'll show, but at least the similarities of being iterative and geometrically convergent. The (reasonably) well-known "power method" can be used to find the largest root. It amounts to... |
| A web search for “geometric algebra Mathematica package” turns up several hits. At least one was presented at a Wolfram Technology Conference, author being Terje Vold (I recall it being a good talk but I’ve not used the package). |
| That appears to be the series for `1/(2+x^2)`. In[5]:= Series[1/(2+x^2),{x,0,8}]//InputForm Out[5]//InputForm= SeriesData[x, 0, {1/2, 0, -1/4, 0, 1/8, 0, -1/16, 0, 1/32}, 0, 9, 1] |
| Ah. My mistake, I misread where the error message was located. |
| You are setting precision higher than that of the input. This means some bits are effectively junk. As for assessing the condition number, one way is like so. {vv, ss, ww} = SingularValueDecomposition[g]; sv = Diagonal[ss]; ... |