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Input and output numpy arrays to h5py
...5py reduces the file size considerably. So, let's say I have the 2D numpy array named A . How do I save it to an h5py file?
Also, how do I read the same file and put it as a numpy array in a different code, as I need to do manipulations with the array?
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How do I sort an array of hashes by a value in the hash?
...
Actually, Array#sort_by! is new in Ruby 1.9.2. Available today to all Ruby version by requiring my backports gem too :-)
– Marc-André Lafortune
Jul 1 '10 at 4:19
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Ruby arrays: %w vs %W
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%w and %W are examples of General Delimited Input types, that relate to Arrays. There are other types that include %q, %Q, %r, %x and %i.
The difference between upper and lower case is that it gives us access to the features of single and double quote. With single quotes and lowercase %w, we hav...
Why are Standard iterator ranges [begin, end) instead of [begin, end]?
...if you are given a range of N elements (say to enumerate the members of an array), then 0 is the natural "beginning" so that you can write the range as [0, N), without any awkward offsets or corrections.
In a nutshell: the fact that we don't see the number 1 everywhere in range-based algorithms is ...
Java - get pixel array from image
...getRGB() method as described in @tskuzzy's answer.
By accessing the pixels array directly using:
byte[] pixels = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData();
If you are working with large images and performance is an issue, the first method is absolutely not the way to...
“Code too large” compilation error in Java
...ion with more than 10,000 lines. Actually, each line assigns a value to an array variable.
13 Answers
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How to read the RGB value of a given pixel in Python?
...bject which returns a pixel access object which you can manipulate like an array:
from PIL import Image
im = Image.open('dead_parrot.jpg') # Can be many different formats.
pix = im.load()
print im.size # Get the width and hight of the image for iterating over
print pix[x,y] # Get the RGBA Value ...
Append integer to beginning of list in Python [duplicate]
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>>>var=7
>>>array = [1,2,3,4,5,6]
>>>array.insert(0,var)
>>>array
[7, 1, 2, 3, 4, 5, 6]
How it works:
array.insert(index, value)
Insert an item at a given position. The first argument is the index of the element bef...
How to get last N records with activerecord?
... database instead of 1. I guess I assume that you need to iterate over the array at some point, so you could let ruby sort it at at that time. (ie. records.reverse.each do ..)
– Dan McNevin
Jan 7 '09 at 14:25
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Split a collection into `n` parts with LINQ?
...tition<T>
(this IEnumerable<T> source, int size)
{
T[] array = null;
int count = 0;
foreach (T item in source)
{
if (array == null)
{
array = new T[size];
}
array[count] = item;
count++;
if (count == size)
...