Reputation
30,145
Next tag badge:
90/100 score
18/20 answers
Badges
1 41 103
Impact
~292k people reached

May
18
comment Choosing FEM element type and mesh refinement
fyi, I copied the code from the notebook. To do this in the future, convert the cells to InputForm and then copy as text and paste here as code.
May
18
revised Choosing FEM element type and mesh refinement
copied code from notebook link
May
17
revised How can I mark a point on a slider control?
clean
May
17
answered How can I mark a point on a slider control?
May
15
comment Internal coupling of Fortran and Mathematica codes
I have no experience with FORTRAN programming Well, you can ask about how to write the Fortran in the Fortran forum. (btw, it is Fortran now, not FORTRAN, the name was changed 25 years ago to indicate modern Fortran :). As I mentioned above, all what you have to do is compile it to an exe (use gfortran, or ifort or any Fortran compiler). Then run it from Mathematica using the RunProcess command. All of this is really straight forward. All what you have to do is write the data from Mathematica (there are number of ways to export data from M) to a text file and read the data from Fortran.
May
14
comment $\mathbf L\mathbf D\mathbf L^\top$ Cholesky decomposition
Here is the LAPACK Fortran implemenation using what is called Bunch-Kaufman diagonal pivoting method for LDL^T factorization for real symmetric (not necessarily positive definite) matrix. I think Mathematica should have an LDL special decomposition. Matlab has one here.
May
14
comment Internal coupling of Fortran and Mathematica codes
If the Fortran program is a stand alone, you can generate the output from your Mathematica script and export the output to a text file, then at the end of the script use the RunProcess command to invoke the Fortran executable, but change the Fortran program to read its input from the text file generated by the Mathematica script. Make sure they reside in the same directory to make it easier to locate the file used to communicate between them. direct Fortran function calling would need using mathlink and is more complicated.
May
14
asked Indeterminate expression 0(I*Infinity]) on indefinite integrals on first use only
May
14
accepted Integrate gives Simplify::infd “simplified to Indeterminate” message
May
12
asked Integrate gives Simplify::infd “simplified to Indeterminate” message
May
6
awarded  Nice Question
May
6
awarded  Enlightened
May
6
awarded  Nice Answer
May
5
awarded  Good Answer
May
1
awarded  Nice Question
Apr
26
awarded  Popular Question
Apr
17
awarded  Popular Question
Apr
16
awarded  functions
Apr
15
awarded  Good Question
Apr
13
comment Drawing nodal lines of wave equation
@Pickett it is not an answer, that is why it is a wiki.