jsomers

Using websockets to easily build GUIs for Python programs

I recently built a small agent-based model using Python and wanted to visualize the model in action. But as much as Python is an ideal tool for scientific computation (numpy, scipy, matplotlib), it's not as good for dynamic visualization (pygame?).

You know what's a very mature and flexible tool for drawing graphics? The DOM! For simple graphics you can use HTML and CSS; for more complicated stuff you can use Canvas, SVG, or WebGL. There are countless frameworks, libraries, and tutorials to help you draw exactly what you need. In my case, this was the animation I wanted:

(Each row represents a "worker" in my model, and each rectangle represents a "task.")

SimeonEhrig

To get the arguments of cling, which are passed on start, you can use the reflection feature of cling.

#include "cling/Interpreter/Interpreter.h"
#include "cling/Interpreter/InvocationOptions.h"

// gCling is an object of type cling::Interpreter
std::vector<const char*> remaining = gCling->getOptions().CompilerOpts.Remaining;
remaining

jbn

def portray_neighborhood_offsets(C, origin, dist_func=None):
    C = C.copy()
    C[origin] = 2
    
    fig, ax = plt.subplots(1, 1)
    ax.imshow(C, 
              interpolation='nearest',  # Not 'none'!
              aspect='equal', 
              cmap=plt.cm.Purples)
    

codingS3b

likema

# - Check glibc version
# CHECK_GLIBC_VERSION()
# 
# Once done this will define
#
#   GLIBC_VERSION - glibc version
#
MACRO (CHECK_GLIBC_VERSION)
    EXECUTE_PROCESS (
        COMMAND ${CMAKE_C_COMPILER} -print-file-name=libc.so.6

shafik

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

cpascual

from __future__ import print_function
import numpy as np
import matplotlib.pyplot as plt
from scipy.optimize import curve_fit


def gauss(x, H, A, x0, sigma):
    return H + A * np.exp(-(x - x0) ** 2 / (2 * sigma ** 2))

def gauss_fit(x, y):

mbinna

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

jaraco

FROM ubuntu:xenial

# general environment for docker
ENV        DEBIAN_FRONTEND=noninteractive \
           FORCE_UNSAFE_CONFIGURE=1

RUN        apt-get update \
           && apt-get install -y --no-install-recommends \
              bzip2 \
              build-essential \

sandsmark

Enable in Settings -> Storage.

Listing documents (returns json blob): http://10.11.99.1/documents/
Listing documents in folder: http://10.11.99.1/documents/${folder_id}/
Getting thumbnail for last opened page: http://10.11.99.1/thumbnail/${document_id}
Upload/import (standard POST call, with 'file' parameter, accepts pdfs and epubs): http://10.11.99.1/upload/
Download (svg or zip with pngs): http://10.11.99.1/download/${document_id}/{pdf,png}
All other requests are served from /usr/share/remarkable/webui/