Reputation
1,619
Next privilege 2,000 Rep.
Edit questions and answers
Badges
5 17
Newest
 Yearling
Impact
~19k people reached

  • 0 posts edited
  • 0 helpful flags
  • 15 votes cast
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/…
Apr
27
answered What are the most common pitfalls awaiting new users?
Mar
17
accepted Median household income for each county in Maryland
Mar
17
accepted Find the volume & weight of a US$4,000,000 gold ingot
Mar
5
asked Median household income for each county in Maryland
Mar
5
asked Find the volume & weight of a US$4,000,000 gold ingot
Feb
8
awarded  Yearling
Feb
7
awarded  Good Question
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 It also includes a notebook of Graphics tricks, but they are quite out of date.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.