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May
23
comment What are the most common pitfalls awaiting new users?
Shouldn't each instance of "function" be changed to "Function" above?
May
21
comment A better simplification function
It would be good if SuperFullSimplify had a MaxTime option. Once the maximum time has passed it should return the best answer it found so far. Also, it seems no ComplexityFuntion is full proof. There will always be cases where the expression deemed least complex isn't the one you like best. It would be good if we could get the 3,4,5 etc expressions have the lowest complexity based on the specified ComplexityFuntion.
May
21
comment What Mathematica features and idioms have $n^2$ complexity or worse
@Jacob Akkerboom you can change the question to anything you like. Also, I would very much like to have a list of coding practices that are shoe to lead to slow programs in Mathematica.
May
18
comment A better simplification function
I saw VOISimplify when it was posted in MathGroup years ago. Ever since, I have wanted WRI to make FullSimplify do this when the LeafCount and number of variables is not too large.
Apr
27
comment How to speed up solution of system of recurrence equations
These equations are unusual because the values of U, V, and Z depend only on future values of U, V and Z. In any case the right tool for this problem is the RecurrenceTable feature documented at reference.wolfram.com/language/ref/…
Sep
23
comment A problem about fixed point iteration theory
I didn't intend to say you are wrong. However, one who does not read carefully might think precision always decreases as computation continues. I wanted to make it clear that isn't always the case.
Sep
21
comment A problem about fixed point iteration theory
From the explanation above you might conclude that the result of a computation always has less precision than the precision than the numbers used in the computation. However, you increase precision in the next two examples. ------- In[1]:= x=SetPrecision[6.2,4.0]; Precision[Erf[x]] Out[2]= 19.9801 In[3]:= Precision[2+(x-62/10-10^-30)^6] Out[3]=19.5467
Sep
19
comment Ted's explanation for the 3rd argument of ListCorrelate doesn't apply to the {1, -1} case?
It looks like I did understand what ListCorrelate does with the third argument, but in that example above, I didn't use the right way of rotating the kernel. I wrote that a long time ago. I have to speculate that I didn't notice that the comparison returned False. I think I should use Mr. Wizard's way of rotating the kernel. When I make that change I will credit Mr. Wizard.
Sep
18
comment How do I evaluate only one step of an expression?
@Tangshutao, You can download the Mathematica notebook from library.wolfram.com/infocenter/MathSource/4557. It also includes a notebook of Graphics tricks, but they are quite out of date.
Aug
3
comment Problem setting up C compiler on a Mac
I evaluated that simple example. It compiles without problem, and it works. The problem is solved.
Aug
3
comment Problem setting up C compiler on a Mac
After doing that I see the clang file. Then I wrote the simple Compile function acl suggested below. It compiled without problem and it works. The problem is solved!
Aug
3
comment Problem setting up C compiler on a Mac
FileNames["/usr/bin/clang"] returns {/usr/bin/clang}. I downloaded and installed Xcode, registered with Apple as an xCode developer. I can open the xCode IDE, but there may be some other steps needed to get it working. Anyway, I thought xCode is an objective-C compiler. From what I read it sounds like you can't write a C program for OSX. It seems you have to write an objective-C program instead. However, Compile in Mathematica doesn't allow for CompilationTarget->"objective C". So what do I do next?
Jul
13
comment How to make use of Associations?
I have been a devoted Mathematica user since version 1.2, but I never picked up much CS education. As a result you always loose me when you talk about immutable, deep copy, shallow copy, bindings, semantics, etc.
Jul
13
comment Struct equivalent in Mathematica?
This comes up too often. If yo insist on using struct, program in C. If you decide to use Mathematica, read relevant portions of the documentation and you will see how the language is intended to be used. Then you should use it as Wolfram intended. You are like a Chinese person trying to use a knife and fork the same way they would use chop sticks.
Jul
13
comment Front End Find feature broken in Version 10 with OSX Mavericks?
@Szabolcs, problem is solved after holding down Sift-Command during startup. Post it as an answer and I will accept it.
Apr
24
comment Using KalmanFilter or KalmanEstimator
@bill s. I think you didn't understand what I am trying to do. I added a figure to clarify.
Apr
21
comment Using KalmanFilter or KalmanEstimator
@bill s: Thanks, but I wasn't able to find a variation of your code that does give something that resembles signalFunction@samplePoints. The first example under Applications at reference.wolfram.com/language/ref/… gives an example of doing this sort of thing. However, I don't know enough about the KalmanFilter to adapt that approach to my problem.
Apr
19
comment Using KalmanFilter or KalmanEstimator
I neglected to change [Omega]s to a number or provide a value. [Omega]s is a Symbol, not a product of symbols. That should be [Omega\s=130.0 (i.e. endpoints {130.0,188.0} )
Feb
22
comment Estimate parameters of the state space model
The function you want might be here. If that isn't what you want, go to the top of that page and look under "See Also".
Jul
21
comment Logarithmic slider
Amazing that you went so deep into undocumented functions!