I have a task Z that can only be completed once either task X or task Y is completed. Also: % The length of task Z depends on which of X or Y is completed: % If task X is completed, task Z takes 4 hours % If task Y is completed, task Z takes 7 hours % Task X takes 5 hours to complete % Task Y takes 3 hours to complete % Task...
Hello all, I want to get some suggestions for my "find similar people" algorithm :). I have one database where I store the following entities: Person, article, keywords. So for each person I have a collection of keywords (with the number of mentions by the person) that have been compiled from person's articles keywords. So I need to get...
Dear all: I want to visualize a function of the form x^n such that n=1,2,...,10. I want these values of n to be generated by a loop and then plot the function as Plot[{x^n},{x,0,100}] and store the plot in an array. Then I want all of these arrays to be displayed into single plot. I tried to do this using Show function but with not much...
http://i51.tinypic.com/15wcw2d.jpg This is an animation I made using Mathematica. As can be seen by highlighting the image, the margins at both the left and right sides are too wide. I don't want to have to submit the image to another program just for the cropping, so what do I do to eliminate the whitespace? Looking at the documentati...
I am writing OCaml code. In part of it, I want to examine whether two arithmetic expression are equal (like x+2+y == x+2*y-y+2). Implemeting this in mathematica is straightforward, so all I want some help on executing Mathematica and get the result back in OCaml. My OS platform is Linux. Cheers, Z. ...
Hello guys, I was wondering how I could obtain the first element of a (already ordered) list that is greater than a given threshold. I don't know really well the list manipulation function in Mathematica, maybe someone can give me a trick to do that efficiently. Thanks ! ...
I am a bit at a loss how to do the following efficiently in Mathematica: a = { 1, 2, 3, 4, 5 }; (* list of integers *) b = { 2, 4, 6, 8 }; (* another list of integers *) filter = Table[MemberQ[b, element], {element,a}] Expected output is: {False, True, False, True, False} My lists a and b are big, so Mathematica is doing a kaz...
Why does the Roots function exist when you can do the same thing with Solve? ...
Hey, I have this little equation that I am trying to solve on Mathematica, but for some reason I cannot get it to work. Any help would be appreciated. Thanks f[x_, t_] = x^2 - x^3; eso = x[t] /. DSolve[{[t] == f[x_, t_], x[0] == 0.2}, x, t] I tried this next, but I keep getting an error f[x_, t_] = x[t]^2 - x[t]^3; eso = x[t] /. DS...
How would a function FunctionQ look like, maybe in a way I can even specify the number of arguments allowed? ...
An interesting 2d section is plane that goes through the center of a regular 3d simplex and 2 other points each of which is a centroid of some non-empty subset of vertices. It is defined by two subsets of vertices. For instance {{1},{1,2}} gives a plane defined by 3 points -- center of the tetrahedron, first vertex, and average of first ...
Hello The output to my mathematica cell is just a long algebraic equation produced from Solve[%, Subscript[u, i, j + 1]]. {{Subscript[u, i, 1 + j] -> (1/( 2 h^2))(-2 h^2 k Subscript[f, i, j] + 2 h^2 Subscript[u, i, j] + 2 b h^2 k Subscript[u, i, j] - h k Subscript[u, -1 + i, j] Subscript[\[Mu], i, j] + h k Subscrip...
I want to write formulas in Mathematica format in my blog, inside tag's formula. What js should I use (and what libary), to replace those tag's, with http://www.wolframalpha.com/ search result image, when Dom gets loaded? For example: <formula>Limit[((3 + h)^(-1) + -1/3)/h, h -> 0]</formula> gets replaced with: If it's to complex o...
I have yet to find a city or location or date, that gives me an answer other than Missing[NotApplicable] to the following query. WeatherData["Chicago", "Conditions", {2010, 8}] That syntax works for "Temperature" and "Pressure" and "WindDirection" But not "Conditions". In particular, if you want data returned for "Conditions" you nee...
I'm using Mathematica 7. I have an interpolated function, here's an example: pressures = WeatherData["Chicago", "Pressure", {2010, 8}] // DeleteCases[#, {_, _Missing}] & // Map[{AbsoluteTime[#[[1]]], #[[2]]} &, #] & // Interpolation; I'd like to compute it's derivative, which is straight forward: dpressures = D[pressur...
I'm trying to figure out how to use Mathematica from C via Mathlink. If I just want to compute the value of a built-in function, I can do MLPutFunction( lp, "RiemannSiegelZ", 1L); MLPutDouble(lp, val); and all is fine. Now, if I want the value of the derivative, things get worse: MLPutFunction( lp, "RiemannSiegelZ'"...
While I'm waiting for the sorting to finish, I would like to adjust a part of Mathematica graph I'm working on. The problem is that nodes are on top of edges, I wonder if there is a way to reverse that. In the image you can see that arrows are not showing proper... I'm doing a GraphPlot[] with custom VertexRenderingFunction and EdgeRend...
What's the inverse of f[x_]:=Flatten[x] where x is Array with dimensions dims? ...
Update: Incorporating suggestions below, here's the version I ended up using to plot feasible region of a system of linear inequalities (* Plots feasible region of a linear program in 3 variables, \ specified as cons[[1]]>=0,cons[[2]]>=0,... Each element of cons must \ be an expression of variables x,y,z only *) plotFeasible3D[cons_] ...
I have the following inequalities on 21 variables: http://pastebin.com/raw.php?i=FTU970Em When I run "Reduce[ineq,Integers]" on this, Mathematica hangs for a long time. That makes sense: there are MANY sets of values for x[1]..x[21] that satisfy the inequalities. All I really want is bounds for each variable (eg, "2 <= x[i] <= ...