User Portlet
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| Is there a list of logical rectangular (over-determined) matrices where the pseudoinverse can be solved by a simple algorithm rather than the Mathematica Function PseudoInverse (Moore-Penrose method)? I seem to recall a page on Wikipedia that... |
| Thank you Kuba for your quick reply plus examples. So "& @" now makes sense, a prefixed pure function. NumberForm is a good idea too -- it gets to the heart of what I wanted. Quantity[] is also desirable, but upon export in tabular form does not... |
| "I would say PT is the geographic region that switches between PST and PDT". The actual definition has PDT as a zone to accommodate portions of PST that do/did/will not change during the year. But I endorse the idea returning a value other than a... |
| Hello all, What do you think about the values given by "Wolfram Alpha" in the cases: 1) sum_{k=n}^1 k = -9 for n=5 ? 2) sum_{k=5}^1 k =0 ? Thank you very much! Iulian |
| I won't confess to a "whim" but anything from 31 and on seems to provide a smooth enough prediction (a prediction much smoother than the observed data). Also using an odd number gets one the appropriate associated time (the middle of the time... |
| Hi Jeff. Thank you so much for your swift answer! Best, Per PS It is not on purpose, that my name is "Updating Name" and neither that my profile pic is missing. Must be something wrong with my community profile... |
| While browsing through the [FunctionRepository](https://resources.wolframcloud.com/FunctionRepository/) I came across [`PositionedCases`](https://resources.wolframcloud.com/FunctionRepository/resources/PositionedCases) which used a `Pattern` for... |
| Hello Guillermo > if someone can solve this PDE using DSolve > I think DSolve cannot solve it. > I found the solution using Laplace Transform > It seems that your solution is wrong: dgl[z/(E^((5 t^2 - 2 tz + z^2)/(4 t)) (2... |
| Thank you so much for your help. I will try my best to use your given link (although I have never used wolfram before). I am using the WOLFRAM alpha and trying to do this. |
| Murat, you are referring to the subject of Numerical Analysis as "Optimized Simulation". In my opinion this is an equivocation. |