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 Feb7 comment Is there a syntax to refer to the domain of a partial function? Thanks. Is $Dom(R)$ standard or do I have to define it as you did before I use it? Feb7 comment Is there a syntax to refer to the domain of a partial function? Thanks for clarifying that. What guarantees the uniqueness of the first element of the pair though with respect to the other pairs? And what is the way of referring to the set of first elements of each pair? Feb7 asked Is there a syntax to refer to the domain of a partial function? Feb7 accepted Can I use set operators on sequences? Feb7 comment Can I use set operators on sequences? Yes. I don't have the issue though in my case, I just want to state whether an element is in a sequence or not. I am not comparing sequences. Feb7 comment Can I use set operators on sequences? Thanks, yes I agree its clearer. Is there a way to say that an element is in a sequence though? Feb7 asked Can I use set operators on sequences? Jan19 comment Is there a standard way to obtain an approximation piecewise-linear function for a function Yes but its not what I want. I want a piecewise linear function, represented by a set of points. Jan19 comment Is there a standard way to obtain an approximation piecewise-linear function for a function @njuffa Not sure what's unclear. If I have a function $f(x)$ I want a vector of pairs $(, , ... )$ that represent a piecewise-linear approximation of the curve of $f(x)$. I do not know $x_0, x_1 ...$ for each function, so discovering them is part of the algorithm I am looking for, and they will be specific for each specific function, and not at regular intervals. I do not want a polynomial approximation though, just a piecewise-linear one. Jan18 comment Is there a standard way to obtain an approximation piecewise-linear function for a function Fair enough, changed to $g(x)$ :). Any idea how do I go about this, or from where do I start looking? Jan18 revised Is there a standard way to obtain an approximation piecewise-linear function for a function deleted 1 character in body Jan18 asked Is there a standard way to obtain an approximation piecewise-linear function for a function Dec20 awarded Caucus Dec20 accepted Computing the value of a function whose derivative is another function Dec19 comment Computing the value of a function whose derivative is another function Cheers. So if $g(t)$ itself is also a function dependent on $h(t)$, I should start at the bottom, integrate each, until I arrive to the integral of $g(t)$. Am I on the right track? Dec19 comment Computing the value of a function whose derivative is another function @KSmarts Well I might need to compute $g(t)$ depending on some other function, but in the simplest case they will all boil down to a constant rate linear function. Dec19 comment Computing the value of a function whose derivative is another function @AndrewSalmon By dependent variables I meant the functions on which $f(t)$ depends on. For example the state of charge of a battery depends on time spent charging and the temperature, but temperature also changes according to time. Dec19 asked Computing the value of a function whose derivative is another function Jul2 awarded Curious May10 accepted Biasing sigmoid curve