lsys | interactive l-system generator | Style Language library
kandi X-RAY | lsys Summary
kandi X-RAY | lsys Summary
interactive l-system generator written in coffeescript. see it running: ./run - this script requires npm.
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QUESTION
I am trying to solve a 1D PDE coupled with an ODE (solved as explicit Euler). I am getting a stack-overflow error if I use small dt. I tried looking at the length of the stack but cannot figure out anything useful from there. I am not very experienced with python (old fortran numerics coder).
The code:
ANSWER
Answered 2021-May-22 at 14:26FiPy makes heavy use of lazy evaluation, so you generally only want to evaluate expressions once, rather than redefining them over and over in a loop.
The most significant changes I made are:
- calling
gradfunc()
withm.value
andmesh.x.value
to avoid a recursive buildup of an unwieldy lazy equation - replacing
R0
with a FiPyVariable
, enabling... - ...writing
eq_m
,eq_v
, andeq
only once, in terms ofR0
, which will change automatically as the problem evolves
QUESTION
Note that I am using a custom implementation of scheme made for my school, so the functions may not look familiar, and your solutions may not work directly. I'm looking more for a generalized method.
I have a recursive macro that evolves an L-system. Basically, it looks something like this:
...ANSWER
Answered 2020-May-03 at 17:08evolve
Macro
It sounds like you may be using the CS 61A Scheme implementation.
In principle, what you should do is move the work out of the macro to a helper procedure which is then called from the macro.
The helper procedure should use an accumulator to store the results so that recursive calls are in tail position, providing an iterative process; each time the helper procedure is called, a new list of symbols is append
ed to the end of the accumulator, but there is no more work to do when the procedure returns.
QUESTION
I have some Turtle code that I've successfully run before to draw the Sierpinski Gasket in Repl.it's Python with Turtle IDE, but recently when I've tried to run it again, it successfully does everything except once it hits the for loop, the turtle just starts spinning and doesn't execute the lines in the for loop until much later.
I've added a print(i) into the forloop and it is printing 0 repeatedly as if it were an infinite loop
...ANSWER
Answered 2019-May-07 at 17:23This cleanup of your code runs fine for me on repl.it and in the Python console:
QUESTION
I'm trying to compile a program called DAOSPEC written in Fortran. It gives me the following error (among similar others):
/usr/bin/ld: /home/osboxes/iraf/bin.linux64//libimfort.a(imakwc.o): relocation R_X86_64_32 against `.bss' can not be used when making a PIE object; recompile with -fPIC
See the full log here.
How do I fix it?
My Makefile ...ANSWER
Answered 2019-Mar-05 at 06:47I have managed to solve the problem, with help from Vladimir F. Ubuntu 18.04 uses PIE, position independent executables (source), and thus it requires libraries to be built with -fPIC
option. The libraries in the official IRAF distribution that I used were not build with -fPIC
, and that's what caused my errors.
Fortunately, one can now install IRAF libraries from the iraf-dev
package on Ubuntu 18.04:
QUESTION
When I start a session in ghci, I use:
...ANSWER
Answered 2018-Jul-26 at 08:45Ok, that is indeed a prompt problem, but not a prompt
problem. :{ :}
Continuations in GHCi use a different prompt, namely prompt-cont
.
QUESTION
I'm trying to use the following code in Javascript. I'd like to pass a function rulefunc() a number of times into the onChange() function iteratively. I want to be able to access i from within the function when it is called. How can I do this?
...ANSWER
Answered 2017-Jun-13 at 07:54You can write a function that returns a function like
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