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Jul
19
revised Suddenly mathematica is very slow when screen is calibrated on windows
edited title
Jul
19
comment Calculating a multiplication of large number of matrices takes a long time
Which version, and which exact syntax? When I evaluate Dot @@ RandomReal[{-1, 1}, {200, 4, 4}] the multiplication is rapid?
Jul
19
comment How can I get constant of integration?
In general you can use DSolve[{y'[x] == f[x], cond}, y[x], x], where cond is something like y[2] == 4 or y'[4] == 0
Jul
19
comment can I expand non-integer powers
FullSimplify[ExpandAll[(a w)^a (w - a w)^(1 - a)] , {w > 0 , 1 > a > 0}] gets the w outside.
Jul
19
comment Suddenly mathematica is very slow when screen is calibrated on windows
@SjoerdC.deVries You made my day, I did this: 1. Control panel -> Color management -> Advanced -> Unmark the setting "Use windows screen calibration" 2. Press Modify system standards, select the screen device, and remove all apparent profiles that are attached to it. Solved the problem
Jul
18
comment Suddenly mathematica is very slow when screen is calibrated on windows
@ciao Actually right before the first time mathematica behaved crap, I follow the instructions from Control Panel -> Screen -> Calibrate Screen, where i set the gamma, and four times choose which text is more readable.
Jul
18
asked Suddenly mathematica is very slow when screen is calibrated on windows
Jul
15
comment How to find the best fit for given input data?
f[t_] = Normal[NonlinearModelFit[top, a + b E^(-c t) - d t E^(-e t), {a, b, c, d, e}, t]] is more beautiful, but it doesn't evaluate to the exact values.
Jul
15
comment How to find the best fit for given input data?
Is this good enough? f = Interpolation[top, InterpolationOrder -> 2, Method -> "Spline"] and Plot[f[t], {t, 0, 100}]
Jul
9
comment Displaying a matrix with integral entries
Are all entries equal?
Jul
9
answered Sum of Products
Jun
24
answered Plotting 3D Intersections
Jun
21
revised Smoothing a unit step function
added 222 characters in body
Jun
21
answered Smoothing a unit step function
Jun
19
revised How to save the current configuration of preferences?
added 34 characters in body
Jun
19
asked How to save the current configuration of preferences?
Jun
18
comment Evaluate a expression split in a list
I have v10 but i didn't know this cool
Jun
18
comment Evaluate a expression split in a list
ToExpression[StringTake[StringReplace[ToString[{1, Plus, 2, Times, 3}/. {Plus -> "+", Times -> "*", Divide -> "/", Minus -> "-"}], "," -> ""], {2, -2}]]
Jun
18
comment MeshFunction at azimuthal angles for RegionPlot3D
Did you try ArcTan[Sqrt[#1^2 + #2^2], #3]?
Jun
18
revised Integrate and NIntegrate combined, giving MaxPrecision error
added 1 character in body