I'd like to load a MATLAB file that stores a 1x1 struct with 4 fields using Go. I haven't found anything comparable to Python's SciPy which has a "loadmat" function. What is the best way to read .mat files in Go?
You may have to write your own Go package. MathWorks suggests that you interface with their MATLAB MAT-file C API. To do that in Go, use cgo.
References:
MATLAB MAT-File Format - MathWorks
Command cgo
C? Go? Cgo!
No, there doesn't seem to be any project for reading MalLab files in pure Go (in CGo, see PeterSO's answer):
go-search doesn't list any relevant project
GitHub doesn't have any either.
the Libraries list doesn't include any
And, there were performance consideration as well, mentioned in "Go matrix library".
The discussion was more about calling go from Matlab.
Related
I would like to write a Cython function that involves strings, so of course I am inclined to use libcpp.string. But I could not figure out how to import std functions like std::to_string().
What is the cleanest way to make std functions available to my Cython file?
A wrapper needs to be written. A full tutorial can be found on docs.cython.org. Some of the standard library has already been ported, but given the monumental effort needed to complete a task (and then do C++11), I highly doubt you'll see std::to_string any time soon.
Anyways, just write it yourself. std::to_string is just a wrapper over std::sprintf anyway.
I started learning lisp and am looking for an efficient way to manage my personal libraries.
So i thought it would be useful to compile my library into a single fasl-file (containing both package-information and actual implementation), that i can afterwards load with (load "lib.fasl") to include the library. Problem is, the library consists of multiple *.lisp-files, lets say foo.lisp and bar.lisp.
I came as far as to compile them separately using (compile-file "foo.lisp") and (compile-file "bar.lisp"), respectively.
Obviously it would be rather messy having to LOAD every file of the library (i.e. foo.fasl and bar.fasl) manually when i want to use them, so i am looking for something like
(link "foo.fasl" "bar.fasl" :output "lib.fasl")
or
(compile-file "foo.lisp" "bar.lisp" :output "lib.fasl")
to produce a single lib.fasl, which I can then LOAD.
I don't want to use core-files, because I want to be able to combine my libraries flexibly (which would require to create a separate core-file for every possible combination of libraries).
I searched both the SBCL user-manual for lisp-functions doing this and the SBCL manpage for functionality using the CLI, but I wasn't able to find anything.
I would prefer a solution using SBCL, but I will take anything else too.
Thanks in advance!
IIRC for SBCL you just concatenate the FASL files into one file.
ASDF 3 has a way to build a single FASL file out of a system or a system with all dependencies (see compile-bundle-op and monolithic-compile-bundle-op).
In its portable library uiop there is also a function combine-fasls, which supports multiple CL implementations.
Use cat:
$ cat f1.fasl f2.fasl .... > mypackage.fasl
Note that the more common way is creating images.
You might also want to explore asdf.
So, this has never happened before, but for some reason, I am unable to view a default MATLAB file. That is, a *.m file that comes with your MATLAB program, (for example 'fft', 'transpose', 'angle', etc).
For example, if I wanted to inspect how the inverse tangent was being computed, all I would do was:
open atan
Right now however, all I get is a *.m file with nothing but comments in it about the file, but no actual code.
What is going on?? I have MATLAB 2013a. I have never seen this before. Why cant I inspect how MATLAB is running certain commands?
Thanks!
This is common, for instance try edit sum, you will not be able to see the code.
When referring to MATLAB built-in functions it's usually meant exactly those functions whose implementation is not carried out with MATLAB language but embedded into the
program. Built-in functions are part of TMW know-how and therefore unavailable to the general user.
The .m file is simply for the documentation.
I just installed the scheme48 package from macports and have started experiencing. I was watching this youtube video, link here and was attempting to perform some of the examples. In the lecture the professor is running scheme on a Sun terminal. For example, I attempt to do '(first 473)' and get 'Error: undefined variable first'. Now, I'm assuming I haven't loaded the correct package / library or what ever it is called in scheme but am not sure what the syntax and library is. I believe that scheme48 and the scheme version on that sun terminal in the video are not the same and could be part of the problem.
So, what library do I need to use and how do I load it?
Those lecture notes are based on a book called Simply Scheme, and you can find the library code that is used in the book here. Specifically, you need simply.scm.
(But whether it is a good idea to have these kind of overloading functions is debatable. Specifically, note that first is used in a way that is different from many other languages.)
I need to port snprintf() to another platform that does not fully support GLibC.
I am looking for the underlying declaration in the Glibc 2.14 source code. I follow many function calls, but get stuck on vfprintf(). It then seems to call _IO_vfprintf(), but I cannot find the definition. Probably a macro is obfuscating things.
I need to see the real C code that scans the format string and calculates the number of bytes it would write if input buffer was large enough.
I also tried looking in newlib 1.19.0, but I got stuck on _svfprintf_r(). I cannot find the definition anywhere.
Can someone point me to either definition or another one for snprintf()?
I've spent quite a while digging the sources to find _svfprintf_r() (and friends) definitions in the Newlib. Since OP asked about it, I'll post my finding for the poor souls who need those as well. The following holds true for Newlib 1.20.0, but I guess it is more or less the same across different versions.
The actual sources are located in the vfprintf.c file. There is a macro _VFPRINTF_R set to one of _svfiprintf_r, _vfiprintf_r, _svfprintf_r, or _vfprintf_r (depending on the build options), and then the actual implementation function is defined accordingly:
int
_DEFUN(_VFPRINTF_R, (data, fp, fmt0, ap),
struct _reent *data _AND
FILE * fp _AND
_CONST char *fmt0 _AND
va_list ap)
{
...
http://www.ijs.si/software/snprintf/ has what they claim is a portable implementation of snprintf, including vsnprintf.c, asnprintf, vasnprintf, asprintf, vasprintf. Perhaps it can help.
The source code of the GNU C library (glibc) is hosted on sourceware.org.
Here is a link to the implementation of vfprintf(), which is called by snprintf():
https://sourceware.org/git/?p=glibc.git;a=blob;f=stdio-common/vfprintf.c