Thank you Harald. Actually, I think I do need the whole list/array with the function evaluated - either as a list or an array. (I am working the TriDiagonal Algorithm.). I am an "in-between" person. I have found that the students make no connection between their engineering classes that often use extremely sophisticated commands from MatLab or just recipes and their math classes with analytic solutions. So I am trying to teach them to do mathematics (or at least check their analytic solutions) with technology but in a way that the understand the steps. I need the simplest most intuitive format possible with the least number of commands. I am still deciding whether to go with Sage lists or NumPy arrays. I had already done the TDA with lists when I thought I should check numpy arrays (and got stuck on the function array). As I understand, arrays are faster as their size is pre-allocated and all elements must be of the same data type. Thanks again, Linda P.S. I see the way to "see" whether it is a list or an array in sage is to use print. If you get commas, it is a list; if you don't it is an array.
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