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I am trying to solve a set of four coupled equations through NDSolve. However, I am getting the error "step size is effectively zero; singularity or stiff system suspected.." I...
Asked on 01/18/2021 by surujjd
1 answerptsTemp = {{-41.78387931007572`, 44.585268167221834`, -12.53827814970699`}, {-40.47813198820931`, 44.585268167221834`, -12.53827814970699`}, {-39.172384666342914`, 44.585268167221834`, -12.53827814970699`}, {-37.866637344476516`, 44.585268167221834`, -12.53827814970699`}, {-36.56089002261011`, 44.585268167221834`, -12.53827814970699`}, {-35.25514270074371`, 44.585268167221834`, -12.53827814970699`}, {-33.94939537887731`, 44.585268167221834`, -12.53827814970699`}, {-32.64364805701091`, 44.585268167221834`, -12.53827814970699`}, {-31.33790073514451`, 44.585268167221834`, -12.53827814970699`},...
Asked on 01/18/2021 by HyperGroups
0 answerI am developing an application containing a large number of functions divided into several independent subcontexts. Let's say I have a main context Main' (defining a few general symbols to...
Asked on 01/18/2021 by hlediks
0 answerData={{0,5678},{0,5654},{1,87675},{2,243},{2,257},{1,9790},{0,7688},{1,97779},{0,6858}}Given a data set similar to the above, how can I select rows where the first column entry is a number that I specify, and the following row is...
Asked on 01/17/2021 by Anonymouse2020
1 answerWhat is the cleanest/simplest way to use ItoProcess to solve the equation $$i text{d}boldsymbol{psi} = Hcdotboldsymbol{psi} text{d}t + boldsymbol{psi}^2text{d}t + text{d}mathbf{w},$$ where $H$ is a matrix, $boldsymbol{psi}$...
Asked on 01/17/2021
1 answerI am trying to plot the profit curve for optimal e(or effort)with respect to c.Profit[c_, e_, F_] := 2 e + c e^2 - (2 e^2)/(1 - e)...
Asked on 01/17/2021 by user74145
0 answerThis is a recurrent topic: replacing subexpressions. See for instance:v = {v1, v2, v3};expr = v/Norm[v] // Simplify[#, Assumptions -> _ [Element] Reals] &(* {v1/Sqrt[v1^2 + v2^2 + v3^2],...
Asked on 01/17/2021
1 answerI am trying to highlight the intersection point (point, dashed lines) in the bottom diagram and the the corresponding point in the top diagram. Unfortunately, I am creating lots...
Asked on 01/17/2021
1 answerI'm given two functionsf[x ,y ]=Cos[x]*Cos[y]/(6+x^2+y^2)anddf[x ,y ]=Grad[F[x,y],{x,y}]I was given a note thatF[1.0,2.0] and dF[1.0,2.0] both evaluate but when g={1.0,2.0} then neither F[g] nor dF[g] evaluate properly...
Asked on 01/17/2021 by imarben007
0 answerIn general, to define a function, we often use f[x_]. Another way is to use pure function (full form and shorthand). I want to test the performance of these function...
Asked on 01/17/2021
0 answerGet help from others!
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