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18h
comment How to speed up NDSolve?
You aren't going to beat the performance of native machine precision by working at lower precision.
1d
comment How to calculate the slope in a data set plotted in ListPlot?
LinearModelFit[data[i-10;;i+10,..]] is part of it. You really have rolled too many questions into one here.
1d
comment Archimedes' Scheme to find $\pi$
i don't know that a numerical evaluation would be considered "proof"..
Apr
29
comment Integrate fortran function into Mathematica
try without the _
Apr
28
comment Change “ListPlot” to 16 bit accuracy?
your syntax is wrong, # should be some symbol, eg to16bits[x_] := Floor[2^16*x]*2.^-16 I cant see what that will accomplish though, i.m sure that tiny roundoff is too small to discern on a plot. (Or do you mean to do that rounding at every iteration?)
Apr
28
comment Simplify assuming $x$ is small
reference.wolfram.com/language/ref/Series.html#26978
Apr
27
comment Jump boundary conditions
I'm afraid you will need to work out your own finite difference scheme.
Apr
27
comment Jump boundary conditions
not sure why the downvote. Anyway NDSolve is not so general that it can handle any sort of bc you can dream up, even if mathematically valid. In this case the pde's look to be fully decoupled, so solve first for u, then use that solution as a bc as you solve for v and so on. Alternately formulate as a single unknown on domain x,0,4
Apr
27
comment Strange DiracDelta integration results in 10.4.1
do the assumptions matter? You should only need s!=0
Apr
26
comment Polynomial Equation/Function With Even Degree Order
start here, reference.wolfram.com/language/ref/NonlinearModelFit.html
Apr
26
comment Free-fall air resistance problem
Put your cursor on Exp and push F1 . You managed to invent two different incorrect expression syntaxes for the exponential.
Apr
26
comment Inconsistent Integrate behavior?
you can do this: Integrate[q0/(-1 + b q0^2), {q0, 0, A}] /. b -> 12 to get your conditional expression. I agree this is an inconsistency. You can also see the issue if you do Integrate[q0/(-1 + 12 q0^2), {q0, 0, 1}] you get a correct message that the integral does not converge while Integrate[q0/(-1 + 12 q0^2), {q0, 0, A}] /. A -> 1 gives an erroneous result.
Apr
26
comment Polynomial Equation/Function With Even Degree Order
"please write code for me" type questions are off topic. Show what you have tried. You should also clarify exactly what trig forms are permissible.
Apr
26
comment I'm trying to solve a system of complex equations
+1 note this works without converting to exact fractions, I think all that does for you is suppress a warning. ( You need parenthesis on (1735/10) btw )
Apr
25
comment NSolve won't act on very large powers
Its not about the exact integer, this gives null results too: Cases[Table[{v, NSolve[1/x == v, x]}, {v, RandomReal[10, 1000] 10^13}], {x_, {}}]
Apr
25
comment How to preview the notebook file in a file explorer just like the preview of pdf file
at one time I had a script set up to auto create pdf versions of every notebook. The main point for me was so that windows search would work on the pdf's. The clutter of all the extra files gets cumbersome though.
Apr
25
comment Use Map on a Function with two variables
aside, just do function[a_, b_] := a+b. Return is needed in mathematica very rarely and often does not behave as you might expect.
Apr
22
comment Exporting sharp corners in Bézier curves to pdf
my thinking is the blunt end is the mathematically correct form. To achieve that corner in eps/pdf you need to render two separate curves that are joined so that the behavior is controlled by linejoin . Sorry I don't know off hand how to do that from within mathematica.
Apr
22
comment How to Import This XYZ format file
from the wikipedia page en.wikipedia.org/wiki/XYZ_file_format "There is no formal standard and several variations exist"
Apr
22
comment How Do i Extract Only The Coordinates xyz (Number) From This Log file
use Import[ filename , "Table" ]. From there it is straightforward to extract the data you need.