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 May 10 comment Optimizing a simple calculus using a list of matrices - Repeated dot product between a vector and a list of matrices Use /@ like {q1,q2}.#.{q1,q2}&/@A. May 9 comment Numerically solve 2nd order differential equation with singularity I will just quote "A powerful way of computing the twelve Jacobian elliptic functions for real or complex values of both the argument z and the modulus k is to use the definitions in terms of theta functions given in ..." as found in NIST Handbook of Mathematical Functions pg. 566 May 9 comment Numerically solve 2nd order differential equation with singularity Btw have you tried expressing your potential using theta functions? May 9 comment Numerically solve 2nd order differential equation with singularity I see, the think is that if you can use the transformation $Y(S)=\int F(s)\, ds,\ S= \frac{F(s)}{y}$ where $F$ a solution of the ODE you can reduce its order by one. But this is a reduction for this ODE and don't know if can be applied to your actual problem. May 9 comment Numerically solve 2nd order differential equation with singularity Do you know any special solution of this ODE? May 8 comment Solve for the intersection point of 3 surfaces If you want to turn them into the form $f_i(x,y,z)=0$ try using Eliminate. May 8 comment Solve for the intersection point of 3 surfaces @bills use ParametricPlot3D May 7 revised Symbolic manipulation of functional form added 134 characters in body May 7 revised Symbolic manipulation of functional form added 4 characters in body May 7 answered Symbolic manipulation of functional form May 7 comment Symbolic manipulation of functional form Take the Jacobian, zero everything as for the constant term just zero everything in the initial expression. May 3 awarded Enthusiast May 1 comment Why does this simple program leak memory? Have you tried inserting $HistoryLength=0 inside ParallelMap like ParallelMap[$HistoryLength=0;Export...] May 1 comment Why does this simple program leak memory? Have you tried removing the set of data used on every export? Something like data[[#]]={}? Apr 30 comment Extracting sequences from a list? @b.gatessucks yes the correct structure of the pattern will depend on the actual data, if the tags contain also in the data strings the OP should exclude just the xml tags. My opinion is that the XMLObject and XMLElement objects must be exploited instead of a flattened list. Apr 30 comment Extracting sequences from a list? If you don't Flatten the data from the xml Case will be a good alternative. Apr 30 answered Extracting sequences from a list? Apr 29 comment List plot 3D not showing correct data @soandos if you check the manual you will see that you gave him to make the 3D plot of an array of height values. Apr 29 comment List plot 3D not showing correct data In your data you give four elements $\{\{a_1,b_1,c_1,d_1\},...\}$ what's the last one for? Apr 29 comment iterate method to find roots @Keith use Most. Also check again the list its impossible to have such an expression [0,1,30].