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1d
comment Inequality involving Quantity stays unevaluated
Simplify also works.
Apr
22
comment Multiply out product of sums
is NN known, or does it need to remain as NN?
Mar
20
comment Turning a list of notes and timings into useful sheet music
You have 10 notes in your song, but 11 entries in your timing list. Should I think of this as: wait 1/4 d5 wait 1/4 d5 wait 1/4 e5 wait 1/4 ... a4 wait 1/2 c5 wait 1/2?
Mar
5
comment Find the volume & weight of a US$4,000,000 gold ingot
@kirma USA! USA! USA!
Mar
5
comment Please help translate regular expression to StringExpression
@Jeremy As Fred says, a~~b~~c is really StringExpression[a, b, c].
Feb
26
comment Ghost trails with Animate?
possible duplicate of Creating ghost trail effects
Feb
25
comment Why does Solve give a wrong solution to an equation?
You can also try the option MaxExtraConditions -> 1
Jan
29
comment Trouble using Manipulate and NDsolve for coupled ODE's
I should note (for clarity) that the proper syntax for Manipulate is: Manipulate[expr, 'controls'], where 'controls' can take various forms (like lists, Control[XXX], etc...). Arguments in WL are separated by commas, and the first argument to Manipulate is the expression to be manipulated. The problem in the OP was that the first argument was actually NDSolve[XXX] and not the CompoundExpression they actually wanted.
Jan
29
comment How to prevent tiny complex errors in Integrate?
Not addressing why you see this particular behavior, but if you want an exact analytic answer, you need exact inputs. 6.5 is not an exact number.
Dec
18
comment Module function corrupts string?
Unless an explicit Return is used, the value returned by For is Null.
Dec
18
comment Module function corrupts string?
it is not a hack to use proper syntax
Nov
25
comment What quantity is this “length” called?
Perhaps you really want a test for the result being a List or not? Then you might look at ListQ (undocumented tho).
Nov
7
comment Selection bugs make Mathematica 10 unusable
support.wolfram.com/kb/12464
Oct
2
comment Replacing columns of a matrix with zeros
I suppose you could do something like this then MapAt[#*0&,list1,{All,1;;3}]
Oct
1
comment Outputting numbers symbolically
Inactivate[Table[2^n, {n, 1, 5}], Power] (I am not obsessed with Inactive I promise)
Oct
1
comment Strange style conversion indicator appeared when type “a Pre”
From reference.wolfram.com/language/ref/CodeAssistOptions.html it looks like the option is "AutoConvertEnable".
Oct
1
comment How to regress negative log?
Something like NonlinearModelFit[data, -p2 Log[p1 x],{p1,p2},x] where p1 and p2 are parameters?
Oct
1
comment Spherical parametric plot
If you have version 9+ you can use: ParametricPlot3D[Evaluate[CoordinateTransform[ "Spherical" -> "Cartesian",{2 Cos[t]+Sin[t],t,Sin[10 t]}]],{t,0,Pi/2}]
Oct
1
comment How to simplify symbolic matrix multiplication using the associativity of scalar multiplication?
This may be too specific: Thread[(2 A).(3 B), Times] /. Dot[a_?NumericQ, b_?NumericQ] :> a b
Sep
12
comment Join decimal part
just beat me to it, yours is the same as mine (essentially):toDecimal[a_, b_] := N[a + (-1)^Sign[a] b 10^(-IntegerLength[b])]; list /. {a_, b_, c_, d_} :> {toDecimal[a, b], toDecimal[c, d]} (* {0.1, -2.259} *)