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bio website verbeia.com/mathematica/tips/…
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visits member for 2 years, 10 months
seen Dec 16 at 0:43

Oct
19
answered Catching error in middle of evaluation of compiled function
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 It also includes a notebook of Graphics tricks, but they are quite out of date.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
18
asked OpenCL vs. CUDA with Mathematica
Aug
5
accepted Problem setting up C compiler on a Mac
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?
Aug
3
asked Problem setting up C compiler on a Mac
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
accepted Front End Find feature broken in Version 10 with OSX Mavericks?
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.
Jul
12
asked Front End Find feature broken in Version 10 with OSX Mavericks?
Jul
2
awarded  Curious
Apr
25
accepted Using KalmanFilter or KalmanEstimator
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
24
revised Using KalmanFilter or KalmanEstimator
I added a figure to clarify.