Re: Using python in D
On Saturday, 8 June 2019 at 19:35:00 UTC, Russel Winder wrote: PyD is hosted on GitHub so it is a question of putting in an issue there: https://github.com/ariovistus/pyd/issues The best bet is to write up what you have presented on email here, and then let the PyD developers guide you into providing the data they need to decide what the actual problem is and how it might be fixed. Thanks for guidance. I also wanted to know: Once executable is successfully created, will it work on systems where Python and pandas are not installed?
Re: Using python in D
On Saturday, 8 June 2019 at 09:11:48 UTC, Russel Winder wrote: ... ... The problem seems to be that PyD is not looking in the right place for importing packages, but this is pure speculation. Perhaps this merits a bug report against the PyD source repository? Thanks for your time, effort and a detailed analysis of this problem. I did not delete Python2.7 since I thought there could be some part of Debian/installed package that may depend on it. But I will try to do it now. I am not well versed with the procedure of submitting bug report and will appreciate if you/some other expert on this forum does it. best wishes, rnd.
Re: Using python in D
On Friday, 7 June 2019 at 10:55:22 UTC, JN wrote:
On Friday, 7 June 2019 at 05:04:30 UTC, rnd wrote:
On Friday, 7 June 2019 at 04:39:14 UTC, rikki cattermole wrote:
On 07/06/2019 3:54 PM, rnd wrote:
How should I 'initialize python' ?
The example is probably a good place to begin.
https://github.com/ariovistus/pyd/blob/master/examples/simple_embedded/hello.d
Thanks for the link. After putting in missing statements, it
started running but reported:
exceptions.ImportError: No module named pandas
I believe pyd is working on Python2 while I have pandas
installed in Python3.
How can I specify Python version 3 in pyd?
https://github.com/ariovistus/pyd
"To use with dub, either specify the relevant subConfiguration
for your python version, or run source pyd_set_env_vars.sh
on linux or pyd_set_env_vars.bat on
windows to set the relevant environment variables and use the
env subConfiguration."
I tried following in dub.selections.json file:
{
"fileVersion": 1,
"versions": {
"pyd": "0.10.5"
},
"subConfigurations": {
"pyd": "python35"
}
}
I also tried python3.5 and python3 in place of python35, but
everytime python27 is being used (where pandas is not installed).
The error is:
$ dub run
Performing "debug" build using /usr/bin/dmd for x86_64.
pyd 0.10.5: target for configuration "python27" is up to date.
<<< NOTE VERSON HERE;
rntestpy ~master: building configuration "application"...
Linking...
To force a rebuild of up-to-date targets, run again with --force.
Running ./rntestpy
pyd.exception.PythonException@/home/cardio/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/pydobject.d(59):
exceptions.ImportError: No module named pandas
/home/cardio/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/exception.d:46
void pyd.exception.handle_exception(immutable(char)[], ulong) [0x56438721e9e8]
/home/cardio/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/pydobject.d:59
pyd.pydobject.PydObject
pyd.pydobject.PydObject.__ctor(deimos.python.object.PyObject*) [0x56438721f2e8]
/home/cardio/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/embedded.d:54
pyd.pydobject.PydObject pyd.embedded.py_import(immutable(char)[])
[0x56438721e501]
source/main.d:6 _Dmain [0x56438721ded0]
Program exited with code 1
I also tried command "dub run --force" but still the error
persists.
I also tried to give command "source pyd_set_env_vars.sh
/usr/bin/python3" but still it is not working.
Another command which I tried produced following output but still
the problem persisted:
$ python3 pyd_get_env_set_text.py
export PYD_D_VERSION_1=Python_2_4_Or_Later
export PYD_D_VERSION_2=Python_2_5_Or_Later
export PYD_D_VERSION_3=Python_2_6_Or_Later
export PYD_D_VERSION_4=Python_2_7_Or_Later
export PYD_D_VERSION_5=Python_3_0_Or_Later
export PYD_D_VERSION_6=Python_3_1_Or_Later
export PYD_D_VERSION_7=Python_3_2_Or_Later
export PYD_D_VERSION_8=Python_3_3_Or_Later
export PYD_D_VERSION_9=Python_3_4_Or_Later
export PYD_D_VERSION_10=Python_3_5_Or_Later
export PYD_D_VERSION_11=__PYD__DUMMY__
export PYD_D_VERSION_12=__PYD__DUMMY__
export PYD_D_VERSION_13=__PYD__DUMMY__
export PYD_LIBPYTHON_DIR=/usr/lib
export PYD_LIBPYTHON=python3.5m
Where could be the problem and how can it be solved?
Re: Using python in D
On Friday, 7 June 2019 at 10:55:22 UTC, JN wrote: On Friday, 7 June 2019 at 05:04:30 UTC, rnd wrote: On Friday, 7 June 2019 at 04:39:14 UTC, rikki cattermole wrote: On 07/06/2019 3:54 PM, rnd wrote: How can I specify Python version 3 in pyd? https://github.com/ariovistus/pyd "To use with dub, either specify the relevant subConfiguration for your python version, or run source pyd_set_env_vars.sh on linux or pyd_set_env_vars.bat on windows to set the relevant environment variables and use the env subConfiguration." After executable is created, will it work on systems where Python and pandas are not installed?
Re: Using python in D
On Friday, 7 June 2019 at 04:39:14 UTC, rikki cattermole wrote: On 07/06/2019 3:54 PM, rnd wrote: How should I 'initialize python' ? The example is probably a good place to begin. https://github.com/ariovistus/pyd/blob/master/examples/simple_embedded/hello.d Thanks for the link. After putting in missing statements, it started running but reported: exceptions.ImportError: No module named pandas I believe pyd is working on Python2 while I have pandas installed in Python3. How can I specify Python version 3 in pyd?
Re: Why any! with map! is not working here
On Thursday, 6 June 2019 at 21:32:11 UTC, Jonathan M Davis wrote: If any is not given a predicate, it defaults to just checking whether the element itself is true (requiring that the element be bool), which is why Marco's suggestion works, but it's a rather odd way to write the code and will be less efficient unless the optimizer manages to optimize away the extra work involved with having map. However, in general, with D, you're not going to find that there is only one way to do things. There are going to tend to be many different approaches to solve the same problem. D code is often simple because of the powerful language constructs and standard library, but it makes no attempt to make it so that there's only one way to do things - especially when you start combining stuff to do whatever it is you're trying to do. - Jonathan M Davis Maybe one of these methods can be made 'official' or 'idiomatic': any!pred(ss); ss.any!pred(); ss.any!pred; This will reduce learning burden on beginners.
Re: Using python in D
Edit: I tried above D program and got following error: core.exception.AssertError@/home/abcde/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/embedded.d(53): python not initialized ??:? _d_assert_msg [0x5562d3f3c466] /home/abcde/.dub/packages/pyd-0.10.5/pyd/infrastructure/pyd/embedded.d:53 pyd.pydobject.PydObject pyd.embedded.py_import(immutable(char)[]) [0x5562d3f0b2f1] source/main.d:6 _Dmain [0x5562d3f0adeb] How should I 'initialize python' ?
Using python in D
I have a simple python script file which contains following 3
statements:
import pandas
df = pandas.read_csv('testfile.csv')
print(df[0:3])
Can I incorporate above in a D program?
I see there is pyd package for using python in D:
https://code.dlang.org/packages/pyd
Will following program work:
import std.stdio;
import pyd.embedded;
void main(){
py_import("pandas");
py_stmts("df = pandas.read_csv('testfile.csv')");
py_stmts("print(df[0:3])");
}
Thanks for your insight.
Re: Why any! with map! is not working here
On Thursday, 6 June 2019 at 09:49:28 UTC, Jonathan M Davis wrote: So, to start, the any portion should be something more like any!pred(ss); or ss.any!pred(); or ss.any!pred; where pred is whatever the predicate is. Apparently, following also works: any(ss.map!(a => a > 127)) // as written by Marco de Wild or any(map!(a => a > 127)(ss)) Thanks for detailed explanations. Philosophically, I personally think, there should be only one way to do such things since that will add to simplicity, as in C. Apparently, smallness and simplicity of C contributed greatly to its success. Only drawbacks of C, like its unsafe parts, should be removed and clearly advantages newer concepts should be added in a clearly defined manner. Just thinking loudly!
Why any! with map! is not working here
I am trying to check if any character in the string is > 127 by
following function:
import std.algorithm.searching;
import std.algorithm.iteration;
bool isBinary(char[] ss){
return (any!(map!(a => a > 127)(ss)));
}
However, I am getting this error:
Error: variable ss cannot be read at compile time
I also tried:
bool isBinary(char[] ss){
return (any!(ss.map!(a => a > 127)));
}
But I get error:
Error: template identifier map is not a member of variable
mysrcfile.isBinary.ss
How can this be corrected?
Not able to use this C++ library in D
I am trying to use C++ DCMTK library ( https://dcmtk.org/ )
functions in D.
A relevant reference page is
https://support.dcmtk.org/docs/classDcmFileFormat.html#details
Following is C++ code modified from
https://stackoverflow.com/questions/5052148/how-to-use-dcmtk-in-qt
#include "dcmtk/dcmdata/dctk.h"
#include
using namespace std;
int main() {
DcmFileFormat fileformat;
OFCondition status = fileformat.loadFile("test.dcm");
if (status.good()) {
cout << "File loaded" << endl;
}else{
cerr << "Error: cannot read DICOM file (" << status.text()
<< ")" << endl;
}
return 0;
}
I have tried to do the same in D with following code:
import std.stdio;
extern (C++) void loadFile(FILE *infile);
extern (C++) class DcmFileFormat;
extern (C++) class OFCondition;
void main(){
DcmFileFormat fileformat;
OFCondition status = fileformat.loadFile("test.dcm");
if (status.good()) {
writeln("File loaded");
}else{
writeln("Error: cannot read DICOM file (", status.text(),
")");
}
}
However, I am getting following errors:
$ dmd dcmtk_eg.d
dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward
referenced when looking for loadFile
dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward
referenced when looking for loadFile
dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward
referenced when looking for opDot
dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward
referenced when looking for opDispatch
dcmtk_eg.d(10): Error: function
dcmtk_eg.loadFile(shared(_IO_FILE)* infile) is not callable using
argument types (DcmFileFormat, string)
dcmtk_eg.d(10):cannot pass argument fileformat of type
dcmtk_eg.DcmFileFormat to parameter shared(_IO_FILE)* infile
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for opDot
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for opDispatch
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for mod
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward
referenced when looking for good
Where is the problem and how can it be solved? Thanks for your
help.
Re: Reading Dicom files in Dlang
On Monday, 3 June 2019 at 15:56:00 UTC, Rémy Mouëza wrote: On Monday, 3 June 2019 at 14:19:40 UTC, Rnd wrote: [...] We can call C functions directly from D. First, the functions must be declared in D, as D's syntax is different from C's. [...] Thanks for a very comprehensive answer.
Re: Reading Dicom files in Dlang
On Friday, 31 May 2019 at 16:43:28 UTC, rnd wrote:
On Friday, 31 May 2019 at 13:49:02 UTC, KnightMare wrote:
struct Range {
private __vector(ushort) _outer;
private size_t _a, _b;
this(vector(ushort) data, size_t a, size_t b) { //
line 457
_outer = data;
_a = a;
_b = b;
}
imo problem is in string
private __vector(ushort)_outer;
it looks like template(vector!ushort) or function or this is
vector from core.simd
and replacing it to private long _outer; fix the problem
paste code imebra.d and imebra_im.d to someplace
Best to download it from https://imebra.com/get-it/ so that all
files are available to you.
I am still waiting for someone to help me with this.
Can we directly call C functions from D without going through
swig?
Re: What is difference between struct and class?
On Monday, 3 June 2019 at 08:54:12 UTC, Jonathan M Davis wrote: structs in D are basically the same as C++ classes that don't have inheritance and can be put on the stack or the heap, and classes in D are akin to C++ classes that use inheritance and are always put on the heap and used via pointers. D classes are similar to Java classes in that respect. - Jonathan M Davis Also struct in D seem to be very similar to classes in C except lack of inheritance. These similarities and differences should be highlighted in documentation etc since many new users have at least some knowledge of C/C++ and understanding will be easier.
Re: What is difference between struct and class?
On Monday, 3 June 2019 at 06:01:15 UTC, Jonathan M Davis wrote: On Sunday, June 2, 2019 9:40:43 PM MDT Rnd via Digitalmars-d-learn wrote: On Monday, http://ddili.org/ders/d.en/index.html If you want to know more about structs and classes specifically, then you can go straight to the sections on them, but you're going to understand a lot of things better if you just read through the book. - Jonathan M Davis I know 'new' is not needed to create instances of structs but can one use 'new'? If yes, when should one use 'new'?
Re: What is difference between struct and class?
On Monday, 3 June 2019 at 00:47:27 UTC, Adam D. Ruppe wrote: On Monday, 3 June 2019 at 00:17:08 UTC, Rnd wrote: What additional features do classes offer in D? Classes support built-in runtime polymorphism through inheritance. structs don't. As a result of this, classes are a little bit heavier resource-wise and are semantically always object references. I am not clear if structs can have constructors (this) and whether they can be multiple? Also can data be made private and getters and setters used to access them?
What is difference between struct and class?
I see that struct can have data as well as member functions and instances can be created. So they sound like classes only. What additional features do classes offer in D?
Re: What does ! Stand for in map! and filter! function calls?
On Sunday, 2 June 2019 at 15:55:46 UTC, Paul Backus wrote: On Sunday, 2 June 2019 at 15:48:54 UTC, Rnd wrote: I have recently started using Dlang, hence this basic question. Thanks for your insight. map and filter are templates in D, and !(...) is D's syntax for passing arguments to templates: map!(x => x*x)([1, 2, 3, 4, 5]) ^ ^ | | | +- This array is a normal function argument | +- This lambda is a template argument Is it not possible in the language to have template map function also to called as map(x=>... ? This will reduce complexity which will attract more people to this language. Easy languages have great mass appeal as has been shown with Ruby and Python.
What does ! Stand for in map! and filter! function calls?
I have recently started using Dlang, hence this basic question. Thanks for your insight.
Re: Reading Dicom files in Dlang
On Friday, 31 May 2019 at 13:49:02 UTC, KnightMare wrote:
struct Range {
private __vector(ushort) _outer;
private size_t _a, _b;
this(vector(ushort) data, size_t a, size_t b) { //
line 457
_outer = data;
_a = a;
_b = b;
}
imo problem is in string
private __vector(ushort)_outer;
it looks like template(vector!ushort) or function or this is
vector from core.simd
and replacing it to private long _outer; fix the problem
paste code imebra.d and imebra_im.d to someplace
Best to download it from https://imebra.com/get-it/ so that all
files are available to you.
Re: Reading Dicom files in Dlang
On Friday, 31 May 2019 at 11:20:15 UTC, KnightMare wrote:
whats wrong with answer at SO?
https://stackoverflow.com/questions/56278268/reading-dicom-files-in-dlang
dlang_wrapper.so file is created.
I try to access it with following file:
import imebra;
import imebra_im;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.sys.posix.dlfcn;
extern (C) int ldl();
void main(){
//auto loadedDataSet = CodecFactory.load("33141578.dcm") ;
printf("+main()\n");
void* lh = dlopen("libdlang_wrapper.so", RTLD_LAZY);
if (!lh) {
fprintf(stderr, "dlopen error: %s\n", dlerror());
exit(1);
}
printf("libdlang_wrapper.so is loaded\n");
}
But it gives following error:
$ rdmd rntestImebra.d
imebra.d(457): Error: function declaration without return type.
(Note that constructors are always named this)
imebra.d(457): Error: found data when expecting )
imebra.d(457): Error: semicolon expected following function
declaration
imebra.d(457): Error: declaration expected, not ,
imebra.d(459): Error: no identifier for declarator _a
imebra.d(459): Error: declaration expected, not =
imebra.d(460): Error: no identifier for declarator _b
imebra.d(460): Error: declaration expected, not =
imebra.d(464): Error: function declaration without return type.
(Note that constructors are always named this)
imebra.d(731): Error: function declaration without return type.
(Note that constructors are always named this)
imebra.d(731): Error: found other when expecting )
imebra.d(731): Error: semicolon expected following function
declaration
imebra.d(731): Error: declaration expected, not )
imebra.d(733): Error: declaration expected, not if
imebra.d(734): Error: unrecognized declaration
imebra_im.d(51): Error: module `string` is in file
'std/c/string.d' which cannot be read
import path[0] = .
import path[1] = /usr/include/dmd/phobos
import path[2] = /usr/include/dmd/druntime/import
Failed: ["/usr/bin/dmd", "-v", "-o-", "rntestImebra.d", "-I."]
Line 457 of part of this code:
struct Range {
private __vector(ushort) _outer;
private size_t _a, _b;
this(vector(ushort) data, size_t a, size_t b) { //
line 457
_outer = data;
_a = a;
_b = b;
}
Reading Dicom files in Dlang
Is it possible to read Dicom (https://en.wikipedia.org/wiki/DICOM ) images (which are widely used in medical field) using D language? Dicom specifications are given here: https://www.dicomstandard.org/current/ There is some discussion on this topic on this page but no details on this forum: https://forum.dlang.org/post/fsjefp$10sp$1...@digitalmars.com I do not think there are any specific d library for this purpose but there are many C libraries available, e.g. : https://dicom.offis.de/dcmtk.php.en and https://github.com/dgobbi/vtk-dicom There is some discussion here on using C for reading Dicom files on [this forum][3]. Can one of these libraries be used to read Dicom images in D language? PS: Sample Dicom images are available here: https://www.dicomlibrary.com/ Wrapper for Imebra has been suggested here (https://stackoverflow.com/questions/56278268/reading-dicom-files-in-dlang ) but it is not working.
