[julia-users] Control package name prefix in expressions returned by macros
Hi, I would like to know how to control the way in which package name prefixes are added in the expressions returned by macros. Let's take a simple example macro, which takes an function call and replaces the first argument by a function "foo" of that argument: macro composefoo(ex) x = ex.args[2] ex.args[2] = :(foo($x)) ex end If I define this in Main I will obtain: julia> macroexpand(:(@composefoo bar(x))) :(bar(foo(x))) But if I define the same macro inside a package called Foo, the result is: julia> using Foo julia> macroexpand(:(@composefoo bar(x))) :(Foo.bar(Foo.foo(Foo.x))) In this example, if the function "foo" is defined inside Foo (and not exported), it is useful to have the prefix automatically added in the returned expression, but I would like to preserve the function name "bar" and the argument "x" untouched. I know that I can escape the returned expression, but that would be dangerous in more complex cases, if the expression contains different lines, including the assignment of values to new variables and I don't want to accidentally overwrite existing variables with the same name in Main. Generally, I would like to escape only the names of the variables and functions that are included in the input expression. But I don't know if there is a smart way of doing that. Best regards Helios De Rosario
[julia-users] [ANN] New package RecurrenceAnalysis.jl
I'm please to announce the release of the new package RecurrenceAnalysis: https://github.com/heliosdrm/RecurrenceAnalysis.jl This package provides tools to perform Recurrence Quantification Analysis (RQA) in Julia. Besides the basic functions to calculate recurrence matrices and RQA parameters (recurrence rate, determinism, entropy, trend, etc.), it currently provides methods to find the optimal embedding dimension and delay for embedding time series in the phase space. I expect to add other utilities in the near future, but any contributions are welcome, including testing for bugs, or comparison with other toolkits. I hope you enjoy it. Best regards, Helios De Rosario
[julia-users] Laxity of inferred types in dictionaries
Take this minimal example:
julia k = [a, b]
2-element Array{ASCIIString,1}:
a
b
julia v = [1, 0.5]
2-element Array{Float64,1}:
1.0
0.5
julia # This is expected
julia Dict(k,v)
Dict{ASCIIString,Float64} with 2 entries:
b = 0.5
a = 1.0
julia # But here the values are of type Any, not Float64
julia [a=1, b=0.5]
Dict{ASCIIString,Any} with 2 entries:
b = 0.5
a = 1
It seems that the literal definition of dictionaries infers Any when the
values (or keys) are not of the same type -- in this example, an integer
and a float. In the creation of arrays, for instance, Julia is not that
loose (it infers Float64 in this example).
It happens the same with other types and supertypes, e.g. with ASCIIString
and UTF8String.
I would have expected the same behaviour in both ways of defining the
dictionary. Is there a reason why it is not so?
Regards
Helios
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Hi Tony, This is the output of versioninfo(), although I'm afraid it is not very informative about the CPU: Commit c03f413* (2014-09-21 21:30 UTC) Platform Info: System: Linux (i386-redhat-linux) CPU: Unknown CPU Type WORD_SIZE: 32 BLAS: libopenblas (DYNAMIC_ARCH NO_AFFINITY Athlon) LAPACK: libopenblas LIBM: libopenlibm LLVM: libLLVM-3.3 On Thu, Oct 16, 2014 at 1:37 PM, Tony Kelman t...@kelman.net wrote: For future reference and trivia purposes, Helios could you post the output from versioninfo() ? I'm curious what generation your CPU is that caused the problem. On Wednesday, October 15, 2014 2:19:10 PM UTC-7, Elliot Saba wrote: Peter, the stable downloads there, are the same as what you get from the http://julialang.org/downloads page. We just haven't put these generic tarball downloads there yet as we're still ensuring we have all the kinks worked out in the build process. Helios, glad it's working for you now! I'm betting the problem here was that the target CPU architecture for the Ubuntu builds was pentium4, whereas the binary I just gave you was targeted at i686. I've since made a change in our ubuntu buildscripts, so hopefully in the future you'll be able to use the PPA painlessly. -E On Wed, Oct 15, 2014 at 1:55 PM, Helios De Rosario helios.d...@gmail.com wrote: helios@ubuntu-pc:~/julia-c03f413bbd/bin$ ~/julia-c03f413bbd/bin/julia _ _ _ _(_)_ | A fresh approach to technical computing (_) | (_) (_)| Documentation: http://docs.julialang.org _ _ _| |_ __ _ | Type help() for help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 0.3.1 (2014-09-21 21:30 UTC) _/ |\__'_|_|_|\__'_| | Official http://julialang.org/ release |__/ | i386-redhat-linux julia println(Hello world!) Hello world! Success!! Many thanks, Elliot. That binary distribution seems to work fine in my machine. (My old history file was not compatible, but the error message the first time I started this version was helpful enough to work around it.) Now I can enjoy of updated Julia. :) Thanks again to all the developers for it. Helios On Wed, Oct 15, 2014 at 10:00 PM, Elliot Saba stati...@gmail.com wrote: H. Could you try downloading this binary distribution http://status.julialang.org/stable/linux-i386, unpacking it, and seeing if it works? It's just a `.tar.gz`, so you can just download it, extract it, and run the julia that's inside the `bin` directory. -E On Sat, Oct 11, 2014 at 5:21 PM, Helios De Rosario helios.d...@gmail.com wrote: Hi Elliot. This is what I have done, with detailed output. I hope it helps to understand what is happening. (My Ubuntu is in Spanish, but I hope that the Spanish output lines are understandable anyway.) 1. Install Julia from the PPA repo helios@ubuntu-pc:~$ sudo apt-get install julia Leyendo lista de paquetes... Hecho Creando árbol de dependencias Leyendo la información de estado... Hecho Los paquetes indicados a continuación se instalaron de forma automática y ya no son necesarios. libllvm3.3 linux-headers-3.13.0-24 linux-headers-3.13.0-24-generic linux-image-3.13.0-24-generic linux-image-extra-3.13.0-24-generic Use 'apt-get autoremove' to remove them. Paquetes sugeridos: ess julia-doc Se instalarán los siguientes paquetes NUEVOS: julia 0 actualizados, 1 se instalarán, 0 para eliminar y 0 no actualizados. Se necesita descargar 0 B/11,6 MB de archivos. Se utilizarán 56,2 MB de espacio de disco adicional después de esta operación. Seleccionando el paquete julia previamente no seleccionado. (Leyendo la base de datos ... 248820 ficheros o directorios instalados actualmente.) Preparing to unpack .../julia_0.3.1~trusty2_i386.deb ... Unpacking julia (0.3.1~trusty2) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Configurando julia (0.3.1~trusty2) ... Processing triggers for libc-bin (2.19-0ubuntu6.3) ... 2. Run Julia normally: helios@ubuntu-pc:~$ julia Instrucción ilegal (`core' generado) 3. Run Julia from gdb (thanks for the suggestion): helios@ubuntu-pc:~$ gdb julia GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as i686-linux-gnu. Type show configuration for configuration details. Para las instrucciones de informe de errores, vea: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/. For help, type help. Type apropos word to search for commands related to word... Leyendo símbolos desde julia...hecho. (gdb) r Starting program: /usr/bin/julia [Depuración de hilo usando
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
helios@ubuntu-pc:~/julia-c03f413bbd/bin$ ~/julia-c03f413bbd/bin/julia _ _ _ _(_)_ | A fresh approach to technical computing (_) | (_) (_)| Documentation: http://docs.julialang.org _ _ _| |_ __ _ | Type help() for help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 0.3.1 (2014-09-21 21:30 UTC) _/ |\__'_|_|_|\__'_| | Official http://julialang.org/ release |__/ | i386-redhat-linux julia println(Hello world!) Hello world! Success!! Many thanks, Elliot. That binary distribution seems to work fine in my machine. (My old history file was not compatible, but the error message the first time I started this version was helpful enough to work around it.) Now I can enjoy of updated Julia. :) Thanks again to all the developers for it. Helios On Wed, Oct 15, 2014 at 10:00 PM, Elliot Saba staticfl...@gmail.com wrote: H. Could you try downloading this binary distribution http://status.julialang.org/stable/linux-i386, unpacking it, and seeing if it works? It's just a `.tar.gz`, so you can just download it, extract it, and run the julia that's inside the `bin` directory. -E On Sat, Oct 11, 2014 at 5:21 PM, Helios De Rosario helios.derosa...@gmail.com wrote: Hi Elliot. This is what I have done, with detailed output. I hope it helps to understand what is happening. (My Ubuntu is in Spanish, but I hope that the Spanish output lines are understandable anyway.) 1. Install Julia from the PPA repo helios@ubuntu-pc:~$ sudo apt-get install julia Leyendo lista de paquetes... Hecho Creando árbol de dependencias Leyendo la información de estado... Hecho Los paquetes indicados a continuación se instalaron de forma automática y ya no son necesarios. libllvm3.3 linux-headers-3.13.0-24 linux-headers-3.13.0-24-generic linux-image-3.13.0-24-generic linux-image-extra-3.13.0-24-generic Use 'apt-get autoremove' to remove them. Paquetes sugeridos: ess julia-doc Se instalarán los siguientes paquetes NUEVOS: julia 0 actualizados, 1 se instalarán, 0 para eliminar y 0 no actualizados. Se necesita descargar 0 B/11,6 MB de archivos. Se utilizarán 56,2 MB de espacio de disco adicional después de esta operación. Seleccionando el paquete julia previamente no seleccionado. (Leyendo la base de datos ... 248820 ficheros o directorios instalados actualmente.) Preparing to unpack .../julia_0.3.1~trusty2_i386.deb ... Unpacking julia (0.3.1~trusty2) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Configurando julia (0.3.1~trusty2) ... Processing triggers for libc-bin (2.19-0ubuntu6.3) ... 2. Run Julia normally: helios@ubuntu-pc:~$ julia Instrucción ilegal (`core' generado) 3. Run Julia from gdb (thanks for the suggestion): helios@ubuntu-pc:~$ gdb julia GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as i686-linux-gnu. Type show configuration for configuration details. Para las instrucciones de informe de errores, vea: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/. For help, type help. Type apropos word to search for commands related to word... Leyendo símbolos desde julia...hecho. (gdb) r Starting program: /usr/bin/julia [Depuración de hilo usando libthread_db enabled] Using host libthread_db library /lib/i386-linux-gnu/libthread_db.so.1. Program received signal SIGILL, Illegal instruction. 0xb730f3ba in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so (gdb) bt #0 0xb730f3ba in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #1 0xb73111fe in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #2 0xb7311407 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #3 0xb7311c4d in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #4 0xb7311f8e in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #5 0xb73126bf in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #6 0xb731201e in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #7 0xb73126bf in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #8 0xb7312178 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #9 0xb731281f in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #10 0xb73137e7 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #11 0xb72ab662 in jl_init_frontend () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #12 0xb72f38a5 in julia_init () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #13 0x08048e76 in main (argc=0, argv=0xb298
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Hi, it is an old 32-bit machine. I had already uninstalled Julia 0.3.1 and downgraded to the 0.2.1 version from the Ubuntu repo, which does run smoothly. But I will give it another try and let you know. Thanks for the support. Helios On Fri, Oct 10, 2014 at 10:11 PM, Elliot Saba staticfl...@gmail.com wrote: What kind of computer do you have? Is it a 32-bit machine or 64-bit? Can you try running julia inside of gdb and giving any information on what gdb says such as a backtrace showing where it crashed? To run julia inside of gdb, just run gdb julia, then when gdb is loaded press r to run julia, and when it crashes, enter bt to get a backtrace. On Fri, Oct 10, 2014 at 12:58 PM, Helios De Rosario helios.derosa...@gmail.com wrote: It is 0.3.1~trusty2. The crash message in the terminal only says core generated (in Spanish). I suppose it means that there is a dump file somewhere with the details, but I cannot find it. If somebody knows where should I look for it, I would be happy to post those details. Thanks Helios On Thu, Oct 9, 2014 at 8:47 AM, Elliot Saba staticfl...@gmail.com wrote: Hello Helios, can you tell me what version of the package you have installed? You can get this via dpkg -l julia. I'm looking for a version number like 0.3.1~trusty1 or similar. Also, can you copy the message given at the crash here? Thanks, -E On Wed, Oct 8, 2014 at 5:56 PM, K Leo cnbiz...@gmail.com wrote: On Xubuntu 14.04 64, it seems to work fine: _ _ _ _(_)_ | A fresh approach to technical computing (_) | (_) (_)| Documentation: http://docs.julialang.org _ _ _| |_ __ _ | Type help() for help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 0.3.1 (2014-09-21 21:30 UTC) _/ |\__'_|_|_|\__'_| | Official http://julialang.org release |__/ | x86_64-linux-gnu On 2014年10月09日 08:50, Helios De Rosario wrote: Hi again, I saw that the 0.3.1 version of Julia was already available to install from the juliareleases repository, and tried to install it. But when I start Julia now it crashes. It generates a core file and suggests sending a report (I accepted). Somebody else has experienced this? I am using Lubuntu 14.04 in an i386 machine. Julia 0.2.1 from the main Ubuntu repository worked normally. How could I report more details to help debug this problem? Thanks for your support Helios De Rosario
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Hi Elliot. This is what I have done, with detailed output. I hope it helps to understand what is happening. (My Ubuntu is in Spanish, but I hope that the Spanish output lines are understandable anyway.) 1. Install Julia from the PPA repo helios@ubuntu-pc:~$ sudo apt-get install julia Leyendo lista de paquetes... Hecho Creando árbol de dependencias Leyendo la información de estado... Hecho Los paquetes indicados a continuación se instalaron de forma automática y ya no son necesarios. libllvm3.3 linux-headers-3.13.0-24 linux-headers-3.13.0-24-generic linux-image-3.13.0-24-generic linux-image-extra-3.13.0-24-generic Use 'apt-get autoremove' to remove them. Paquetes sugeridos: ess julia-doc Se instalarán los siguientes paquetes NUEVOS: julia 0 actualizados, 1 se instalarán, 0 para eliminar y 0 no actualizados. Se necesita descargar 0 B/11,6 MB de archivos. Se utilizarán 56,2 MB de espacio de disco adicional después de esta operación. Seleccionando el paquete julia previamente no seleccionado. (Leyendo la base de datos ... 248820 ficheros o directorios instalados actualmente.) Preparing to unpack .../julia_0.3.1~trusty2_i386.deb ... Unpacking julia (0.3.1~trusty2) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Configurando julia (0.3.1~trusty2) ... Processing triggers for libc-bin (2.19-0ubuntu6.3) ... 2. Run Julia normally: helios@ubuntu-pc:~$ julia Instrucción ilegal (`core' generado) 3. Run Julia from gdb (thanks for the suggestion): helios@ubuntu-pc:~$ gdb julia GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as i686-linux-gnu. Type show configuration for configuration details. Para las instrucciones de informe de errores, vea: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/. For help, type help. Type apropos word to search for commands related to word... Leyendo símbolos desde julia...hecho. (gdb) r Starting program: /usr/bin/julia [Depuración de hilo usando libthread_db enabled] Using host libthread_db library /lib/i386-linux-gnu/libthread_db.so.1. Program received signal SIGILL, Illegal instruction. 0xb730f3ba in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so (gdb) bt #0 0xb730f3ba in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #1 0xb73111fe in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #2 0xb7311407 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #3 0xb7311c4d in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #4 0xb7311f8e in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #5 0xb73126bf in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #6 0xb731201e in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #7 0xb73126bf in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #8 0xb7312178 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #9 0xb731281f in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #10 0xb73137e7 in ?? () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #11 0xb72ab662 in jl_init_frontend () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #12 0xb72f38a5 in julia_init () from /usr/bin/../lib/i386-linux-gnu/julia/libjulia.so #13 0x08048e76 in main (argc=0, argv=0xb298) at repl.c:355 (gdb) q Una sesión de depuración está activa. Inferior 1 [process 4096] will be killed. ¿Salir de cualquier modo? (y o n) y And these are the contents of /proc/cpuinfo: processor: 0 vendor_id: AuthenticAMD cpu family: 6 model: 8 model name: Unknown CPU Type stepping: 1 cpu MHz: 1799.769 cache size: 256 KB physical id: 0 siblings: 1 core id: 0 cpu cores: 1 apicid: 0 initial apicid: 0 fdiv_bug: no f00f_bug: no coma_bug: no fpu: yes fpu_exception: yes cpuid level: 1 wp: yes flags: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow bogomips: 3599.53 clflush size: 32 cache_alignment: 32 address sizes: 34 bits physical, 32 bits virtual power management: ts If you need any further info, just ask. Thanks and best regards Helios
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
It is 0.3.1~trusty2. The crash message in the terminal only says core generated (in Spanish). I suppose it means that there is a dump file somewhere with the details, but I cannot find it. If somebody knows where should I look for it, I would be happy to post those details. Thanks Helios On Thu, Oct 9, 2014 at 8:47 AM, Elliot Saba staticfl...@gmail.com wrote: Hello Helios, can you tell me what version of the package you have installed? You can get this via dpkg -l julia. I'm looking for a version number like 0.3.1~trusty1 or similar. Also, can you copy the message given at the crash here? Thanks, -E On Wed, Oct 8, 2014 at 5:56 PM, K Leo cnbiz...@gmail.com wrote: On Xubuntu 14.04 64, it seems to work fine: _ _ _ _(_)_ | A fresh approach to technical computing (_) | (_) (_)| Documentation: http://docs.julialang.org _ _ _| |_ __ _ | Type help() for help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 0.3.1 (2014-09-21 21:30 UTC) _/ |\__'_|_|_|\__'_| | Official http://julialang.org release |__/ | x86_64-linux-gnu On 2014年10月09日 08:50, Helios De Rosario wrote: Hi again, I saw that the 0.3.1 version of Julia was already available to install from the juliareleases repository, and tried to install it. But when I start Julia now it crashes. It generates a core file and suggests sending a report (I accepted). Somebody else has experienced this? I am using Lubuntu 14.04 in an i386 machine. Julia 0.2.1 from the main Ubuntu repository worked normally. How could I report more details to help debug this problem? Thanks for your support Helios De Rosario
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Hi again, I saw that the 0.3.1 version of Julia was already available to install from the juliareleases repository, and tried to install it. But when I start Julia now it crashes. It generates a core file and suggests sending a report (I accepted). Somebody else has experienced this? I am using Lubuntu 14.04 in an i386 machine. Julia 0.2.1 from the main Ubuntu repository worked normally. How could I report more details to help debug this problem? Thanks for your support Helios De Rosario
[julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Hi, I have just changed the OS of my computer to Ubuntu 14.04 (actually Lubuntu... too old a computer for other options). I am looking forward to installing Julia, but the official documentation has not still any pointer that seems appropriate for this version. https://launchpad.net/~staticfloat/+archive/juliareleases does not still contain packages for Trusty Tahr. Adding ppa:staticfloat/juliareleases by command line or by the dialog for origins of software does not seem to work either. I have found, however, this: http://packages.ubuntu.com/trusty/julia But the page for download says that it is not advisable to install that manually. Is that correct? Any advice will be more than welcome. Best regards Helios
Re: [julia-users] PPA for Ubuntu 14.04 (Trusty Tahr)
Great. Thanks! El sábado, 19 de abril de 2014 23:09:39 UTC+2, Elliot Saba escribió: Hello Helios. I am currently working on updating the PPA for trusty. I will post here when the packages are available for download. The main repository you linked has a Julia 0.2.1 package which will be the same as what you get from the juliareleases repo, so go ahead and install that if you wish. Note however that the main Ubuntu repositories will lag behind the Julia releases repository so, for instance, when we release julia 0.3 it will not show up outside of the juliareleases repository for some time. On Apr 19, 2014 1:58 PM, Helios De Rosario helios.d...@gmail.comjavascript: wrote: Hi, I have just changed the OS of my computer to Ubuntu 14.04 (actually Lubuntu... too old a computer for other options). I am looking forward to installing Julia, but the official documentation has not still any pointer that seems appropriate for this version. https://launchpad.net/~staticfloat/+archive/juliareleases does not still contain packages for Trusty Tahr. Adding ppa:staticfloat/juliareleases by command line or by the dialog for origins of software does not seem to work either. I have found, however, this: http://packages.ubuntu.com/trusty/julia But the page for download says that it is not advisable to install that manually. Is that correct? Any advice will be more than welcome. Best regards Helios
[julia-users] ccall to sscanf for float variables
Hello,
This is my first post in this group. Please correct me if I make some
mistake in asking my question. (I have not found any specific posting
guide for this group.)
I'm accustomed to use sscanf in C and Octave, and it is one of the first
things that I missed when started using Julia. I'm not sure of the reason
why it is not implemented (on the other hand there is the @sprintf macro).
Of course, regular expressions can do that work as well, and perhaps Julia
developers have reasons to prefer that option to a scanf-like function. But
I have not found any statement about this topic in the manual, this group
or anywhere else.
Ok, be that as it may... I tried to call the C function sscanf with ccall
(at least for fun, if not for practical reasons), but I have not been able
to make it work to scan float variables. For example, this does work (using
int and string variables):
## C equivalent code:
# int hour, minutes;
# char ampm[3];
# sscanf(12:30 AM, %d:%d %s, hour, minutes, ampm);
hour = Int32[0]
minutes = Int32[0]
ampm = ??
ccall(:sscanf, Int32, (Ptr{Uint8}, Ptr{Uint8}, Ptr{Int32}, Ptr{Int32}, Ptr{
Uint8}),
12:30 AM, %d:%d %s, hour, minutes, ampm)
However, if I want to scan a float, sscanf fails to parse the string. E.g.
replace hour or minutes by a Float64 - or Float32 - array, and change
the corresponding %d in the pattern string by %f, %g, %e, etc.; in
that case ccall returns 0, and the variables do not change.
Any idea of why?
I'm using Julia 0.2.1 for Windows 32 bit in Windows 7. Please let me know
if you need more details.
By the way, you will see in the example that in the first argument to ccall
I have only put the name of the C function, instead of a tuple including
the name of the C library (stdio in this case). The reason is that using
the tuple throws an error (error compiling anonymous: could not load
module stdio: no error). Does it anything to do with my not having MinGW
or any other compiler installed in my machine?
