I am assuming that you are using a C99 compiler (with support for dynamically sized arrays). The problem in your code is that at the time when the compilers sees your variable declaration it cannot know how many elements there are in the array (I am also assuming here, from the compiler error that length … Read more
MSVC is not a C99 compiler, and does not support variable length arrays. At https://docs.microsoft.com/en-us/cpp/c-language/ansi-conformance MSVC is documented as conforming to C90.
That leeway wording doesn’t mean that any and everything in C99 is in C++11. What you quoted is just introductory text.
You can use itertools.zip_longest: import itertools np.array(list(itertools.zip_longest(*v, fillvalue=0))).T Out: array([[1, 0], [1, 2]]) Note: For Python 2, it is itertools.izip_longest.
This is variable length arrays or VLA which is a C99 feature but gcc and clang support it as an extension in C++ while Visual Studio does not. So Visual Studio is adhering to the standard in this case and is technically correct. Not to say that extensions are bad, the Linux kernel depends on … Read more
In order to answer the question, we should first clear up some concepts. What is an array and how can it be used? And what is the code in the question, if not an array? What is an array? The formal definition of an array is found in the C standard, ISO 9899:2011 6.2.5/20 Types. … Read more
[*] (Background: I have some experience implementing C and C++ compilers.) Variable-length arrays in C99 were basically a misstep. In order to support VLAs, C99 had to make the following concessions to common sense: sizeof x is no longer always a compile-time constant; the compiler must sometimes generate code to evaluate a sizeof-expression at runtime. … Read more