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1h
comment parsed matrix not deleting elements in adjusted matrix
1) w is not defined in the first block of code. 2) In the second block delete is {7,9}. It looks like you want to map multiples of 49 and 81 to 0. However, it doesn't look like they are present in TrueMatrix. 3) w[_, Alternatives @@ delete] evaluates to (7 | 9)^2 _ not something that looks like anything in your matrix.
1h
comment solving singular matrix
See Basic Syntax Issues.
1h
comment Why is Likelihood / LogLikelihood not working?
@ChenStatsYu see edit
4h
comment Why is Likelihood / LogLikelihood not working?
Shouldn't that be 1-p1-p2-p3?
4h
comment import from Excel adds a point to each number …How to get rid of it?
You can find it in the answer linked to by Yves. To make a long story short: use Chop or (not as good) Floor. I would use Round.
1d
comment Can I define an axiomatic (Boolean algebra) system and prove theorems using Mathematica?
TautologyQ[([Not] (a [Or] b)) == ([Not] a [And] [Not] b), {a, b}]
1d
comment How to export a vector of vectors (Mathematica 8)?
Or Save or DumpSave
2d
comment Matrix form of complex numbers
In not talking about the numbers in one matrix diagonal, but about two different matrices. As far if I know if the diagonals differ the complex numbers differ. And you still haven't given the example we asked for...
2d
comment Matrix form of complex numbers
If the numbers on the diagonal are different the complex number they code for is different.
2d
comment Matrix form of complex numbers
As far as I know the matrix above uniquely codes for the complex number a + b i. See, e.g., this page. Please give an example or reference of the contrary as Daniel asked.
Dec
18
comment My matematica notebook dosen't work,its bring syntax error ,why?
Usually it is possible to copy quite some bits of useful code from a corrupt notebook using a simple tool as Notepad. And as to corruption: sometimes adding a } at the correct place may be all that is needed.
Dec
18
comment FullSimplify wont simplify to expression with lower SimplifyCount
@danielj I wouldn't really know how to do that.
Dec
18
comment FullSimplify wont simplify to expression with lower SimplifyCount
@DanielJ Exactly. You could guide Mathematica by changing the SimplifyCount to heavily tax expressions with elements that you find undesirable like powers or sines.
Dec
17
comment Manipulate plot
What's your problem with case i)? It works as expected. For your second case, you have to make the variables visible. Just define g[x_, s_, c_] = z /. rule outsize of the manipulate or with its Initialization option and use g[x, c, s] in the plot.
Dec
17
comment Manipulate plot
In your latest update you haven't put any visible references to x, c, and s in the expression, which is necessary. Again, this is explained in the link.
Dec
17
comment Manipulate plot
I may be missing something here, but if you have a well defined function f[x,c,s] all you have to do is put f[x,c,s] as Plots first argument. All the necessary variables are visible to Manipulate then and it it should just work as explained in Karsetn's link.
Dec
17
comment How to plot a projectile motion graph that changes with the different angles?
Could you try to format your code please? Instructions can be found at the top right of the edit box.
Dec
16
comment How to extract equations from WolframAlpha step-by-step solution programmatically?
I have been looking through the FullForm of the output, but it is a mess of various boxes for which I don't see an easy way to isolate just the equation parts. The problem is that strings may occur in equations and equations in the midst of text. The equations can be selected individually and copied, but I guess that's not what you want.
Dec
16
comment Bug in ArcLength?
Has this been reported to support@wolfram.com?
Dec
16
comment Using OpenRead to read an element from a list saved in .mx format
@SquareOne Good to know that the change is now officially confirmed.