m_goldberg
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 Jan 25 reviewed Leave Open What is wrong with my user-defined ordering function? Jan 25 revised What is wrong with my user-defined ordering function? edited title Jan 25 reviewed Leave Open How to evaluate Boolean expression and get an answer in bitwise form? Jan 25 revised Handling of Temporal Data Added more details Jan 25 answered Handling of Temporal Data Jan 25 comment Issues with PlotRange! I have tagged this question with bugs for the reasons I give in my answer below. Jan 25 revised Issues with PlotRange! edited tags Jan 25 answered Issues with PlotRange! Jan 25 revised How to demonstrate a limit without having to pre-calculate certain points edited title Jan 25 revised How to demonstrate a limit without having to pre-calculate certain points Improved formatting Jan 25 revised Confining/Periodic boundary conditions implementation for 2D Random Walker Cleaned kruff out of code Jan 25 revised Confining/Periodic boundary conditions implementation for 2D Random Walker deleted 8 characters in body Jan 25 revised Confining/Periodic boundary conditions implementation for 2D Random Walker Small improvement to user interface Jan 24 answered Confining/Periodic boundary conditions implementation for 2D Random Walker Jan 24 comment Problem in trying to solve a differential equation The error message is telling you didn't give any initial conditions in your NDSolve expression. Jan 24 revised Problem in trying to solve a differential equation Routine clean-up Jan 24 comment How do I write a function that returns the atomic mass given an element's symbol? @1234. I can supply such a function, but i don't see any use for it. The density of a solid is not related to the atomic mass of its constituent elements in any simple way. For example, Au has a lower atomic mass than Pb, but it is denser. Jan 24 awarded core-language Jan 24 revised Confining/Periodic boundary conditions implementation for 2D Random Walker Routine clean-up Jan 23 comment How do I write a function that returns the atomic mass given an element's symbol? @1234. I'll give a hint. Write a function that takes Fe73B13Si9 as a string and use built-in string and list processing functions to make two lists: {"Fe", "B", "Si"} and {73, 13, 9}. Map atomMass over the 1st list, then do a dot product.