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If I have the following code:ListLinePlot[ {{{0, 25}, {1, 200}, {2, 200}, {3, 0}}, {{2, 200}, {3, 0}, {4, 200}, {5, 200}, {6, 0}, {7,...
Asked on 04/26/2021
1 answerHow can I get a ternary density plot just like the plots from OriginLab? ContourPlot and DensityPlot seemingly can accept the [f, {x},...
Asked on 04/26/2021 by Scott Wang
8 answerI'm trying to make some numerical simulation with NDSolve. I have encountered a few problems. Here is a simplified version of the equations:Cwirk = 50 25 3;eq= {Q[tau] -...
Asked on 04/26/2021 by 407PZ
5 answerSum[((-1)^(i + 1)*Binomial[n, i]*(n - i)!)/n!, {i, 1, n}]This cause a Recursion problem.As the comment said, If simplify the formula and then sum it, problem vanished.((-1)^(i +...
Asked on 04/26/2021
0 answerI was trying to get the volatility value of a specific equity on a given day. Based on the Mathematica Help, the syntax is FinancialData["name","prop",{start,end,...}] gives a list of dates...
Asked on 04/26/2021
1 answerI have a list of rules such aslistofrules = {{1, 1, 2, 5, 14} -> 1, {1, 1, 2, 7, 12} -> 1, {137, 1, 2, 6, 16} ->...
Asked on 04/26/2021 by Hegel19
3 answerIntegrate[DiracDelta[1 - y]*DiracDelta[y - 5], {y, 0, 10}]this is divergent integral but thisIntegrate[DiracDelta[1 - y]*DiracDelta[y - 5], {y, 0, 3}]and thisIntegrate[DiracDelta[1 - y]*DiracDelta[y - 5], {y, 3,...
Asked on 04/26/2021
1 answerI have a 3 dimensional list of points which i would like to extrude in z coordinate with thickness n, i.e. z_{i} -> z_{i}+n for all points in z. There...
Asked on 04/25/2021
4 answerSo I have this function: $$ int_{-infty}^{infty} mathrm {sech}(x+s)^{2} {rm sech}(x)^{2}dx$$ And when I try to integrate it, I can obtain the indefinite integral:In[42]:= Integrate[Cosh[x + s]^-2*Cosh[x]^-2, x]Out[42]=...
Asked on 04/25/2021 by Dimitri_896
2 answerI'm trying to solve this second order D.E.eq[t_] = x''[t] - (D[Log[solx[t]], t] + D[Log[Abs[D[x[t], t]]^2], t]) (x'[t]^2 + Abs[x'[t]]^2)where:solx[t_] := -0.7 (0.0015 + t)^(-2)But both the analytic...
Asked on 04/25/2021 by Dr. phy
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