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 Apr20 answered Data plotting to estimate answers Apr20 comment Data plotting to estimate answers What you're talking about is trying to fit a function according to partial data. There are many ways to do it, but the most important step is to assume something about the structure of the function. Do you have any reason to believe that the function $t(n)$ (where $t$ is the time and $n$ is the stage) is polynomial (i.e. linear/quadratic...)? or exponential? or logarithmic? or what? Apr20 answered Cross-Correlation with TimeSeries Apr19 comment First Order Conditions This is a very complicated expression to decipher. If you could produce a minimal example that shows where you're stuck it would motivate users here to help you. Feb17 comment How to change the expressions in terms of a specific variable? Your question is unclear. Isn't the answer simply given by your third equation? That is, $$h=2y$$ Feb2 comment NDSolve with initial condition: initial conditions did not evaluate to an array of numbers of depth 1(for 1D) or 2 (for 2D) on spatial grid I would recommend to create a minimal example showing the problem. This way your pretty likely to find it yourself. For example, on my machine, if I delete the WhenEvent onwards, and work with the default options of NDSolve, the problem disappears. Feb2 awarded Yearling Feb1 answered How to filter acoustic signal Feb1 comment How to filter acoustic signal I don't quite understand. Isn't the output of FindPeaks exactly what you're looking for? Feb1 comment How to automate repetitive evaluation of a notebook from a parent notebook I think a more concrete example will help us greatly in helping you. Jan14 accepted Replace expression, but only “outside” of a function Jan14 comment Replace expression, but only “outside” of a function Thanks. But lists of replacement rules are executed consecutively, so this will not work. Jan14 asked Replace expression, but only “outside” of a function Dec11 answered Only show part of a cube below an intersecting plane Dec2 comment How to solve ReplaceAll problem inside Manipulate A good habit will be to create a ''minimal working example'', that is, reproducing the problem with as little superfluous code as possible. This greatly increases the chances that (a) people will take the time to answer your question (b) the answer will be relevant to other users, and (c) you'll solve it on your own by trying to reduce the code. Dec2 accepted How to “undo” SetOptions (restore defaults) Dec1 asked How to “undo” SetOptions (restore defaults) Nov25 answered List Manipulation Via Conditionals Nov15 answered ListPlot3D with small (but acceptable) precision Nov15 comment TransformedDistribution using n iid random variables iid[k_, dist_] := TransformedDistribution[Sum[a[i]^2, {i, k}], Table[Distributed[a[i], dist], {i, k}]]