# User Portlet

Miguel Olivo-V
Discussions
I'm trying to specify rules for my plot, but they seem to be ignored by Mathematica: GeoRegionValuePlot[{ Entity["AdministrativeDivision", {"Arkansas", "UnitedStates"}] -> 1, Entity["AdministrativeDivision", {"California",...
I have a list of strings of the form list={str1,str2,strx,str3,...,str10} each string contains both letters and numbers, except for strx which does not contain numbers, what I want to do is attach strx to the element that immediately...
Nevermind, just realized Mathematica can handle Table[f[x,y],{x,1,T},{y,1,Min[x,K]}]
Thanks Frank, what does that mean? The system has no solution (at least with the restriction that the values must lie in [0,200])? If you think about it, it must have a solution given that it can be viewed as a system of recursive equations with...
Hi, I'm trying to solve the system  \begin{align*} &V(m)=\alpha + \beta V(m+1)+\beta \sum_{f=1}^4 Z(m+1,f)\\ &U(f)=\gamma +\beta U(f+1)+\beta \sum_{m=1}^4 Z(m,f+1)\\ &Z(m,f)=\zeta + \beta (Z(m+1,f+1)+U(f+1)+V(m+1))\\ ...
Hi, I was wondering if I can improve on this method for solving a particular system of coupled recurrence equations. I have attached a pdf file with the system of equations and a notebook file with the solutions. Notice that I have to solve for...
I'm in Canada, got the email notifying me of the updated site licence a few hours ago. However we got 10.0.2 about 6 or 7 days later, I had to download a trial to satiate my curiosity!
Hey Marco, I saw you profile and it seems that you also work with data. I have used Mathematica since version 4 for symbolics and for simple data analysis using matrices but now I feel outdated with respect of these new objects that Mathematica has...
You can write the time subscripts as arguments, i.e. type p[t], p[t+1], etc. As for other subscripts, you can just type y1, y2. One more thing, you have to either write the expressions in different cells or separate them using semicolons instead...
Hi, I'm trying to define the derivative of a function H to be positive. I'm using H/:Positive[H'[x]]=True But I get the error TagSetDelayed::tagpos: Tag H in Positive[H'[x]] is too deep for an assigned rule to be found. I also...