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*MODERATOR NOTE: coronavirus resources & updates:* https://wolfr.am/coronavirus ---------- Christos Papahristodoulou May 29, 2020 The three Nordic countries together, Denmark, Norway and Finland had in May 28, almost 200 deaths per... |
*MODERATOR NOTE: coronavirus resources & updates:* https://wolfr.am/coronavirus ---------- In this document I apply the standard SIRD model , using Italian COVID19 data. Up to date, May 23, there are 89 daily observations, starting from... |
Help please! I have a manipulated graph programmed in Version 11, which worked perfectly, but when I run it with version 12, it works, but a "red" area appears with the error "A tick position in the value of the Ticks option should be a number. ". I... |
I have parametrized a complex economic growth model and reduced it to a system of 5 linear & non-linear equations, including one parameter with bounds. All solvers (NSolve, FindRoot, FindInstance etc) fail to solve it within 5 minutes with various... |
The following function is positive, easy to see it, but Mathematica fails! Why? I have tried with Reduce, and Find Instance or the following. If one sets some parameters, such as T = 60 and S = 20 (in fact T > S) the =0?: Assuming[T > S && r... |
Hi! I have tried to solve the following non-linear integer max-problem, without setting some lower (positive) bounds on Q1, Q2 & Q3, just being positive. Mathematica fails to find the optimal solotion, unless I increase the lower bounds for Q2 & Q3... |
The data is given by: q = Flatten[ Table[{a, b, c, d}, {a, 0, 1}, {b, 0, 1}, {c, 0, 1}, {d, 0, 1}], 3]. Mathematica gives the following order: {{0, 0, 0, 0}, {0, 0, 0, 1}, {0, 0, 1, 0}, {0, 0, 1, 1}, {0, 1, 0, 0}, {0,... |
Hi everyone! I have tried to present my Mathematica documents (.nb or .cdf) to my students in class by connecting my laptop through a projector. Unfortunately I can't see in my computer simultaneously, what is being projected, no matter which... |
Hi, The attached file includes my own Demonstration and one found in Wolfram, both created by Mathematica 10 and worked perfectly. When I tried to use it with the new Mathematica 11, it does not work properly (it seems to be the "Epilog" that... |
In the following dynamic graph the red team (4-4-2) plays against the blue team (4-3-3). It is better when the red team plays with the slider(t) forward and the blue team backward. Enjoy it! [1]:... |