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Display image as grayscale using matplotlib
...s plt
from PIL import Image
fname = 'image.png'
image = Image.open(fname).convert("L")
arr = np.asarray(image)
plt.imshow(arr, cmap='gray', vmin=0, vmax=255)
plt.show()
If you want to display the inverse grayscale, switch the cmap to cmap='gray_r'.
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Regex Named Groups in Java
It is my understanding that the java.regex package does not have support for named groups ( http://www.regular-expressions.info/named.html ) so can anyone point me towards a third-party library that does?
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How do you parse and process HTML/XML in PHP?
...he SimpleXML extension provides a very simple and easily usable toolset to convert XML to an object that can be processed with normal property selectors and array iterators.
SimpleXML is an option when you know the HTML is valid XHTML. If you need to parse broken HTML, don't even consider SimpleX...
Java Naming Convention with Acronyms [closed]
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@DerFlatulator: it's a question of automation when converting from UpperCamelCase to lowerCamelCase: I had the problem when automating Hibernate mapping to a snake_case: DvdPlayer -> dvd_player but DVDPlayer -> d_v_d_player. There is no way to automate DVDPlayer to dvd_...
Use of exit() function
I want to know how and when can I use the exit() function like the program in my book:
13 Answers
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How do I get the current line number?
...ose using .Net 4.5 or later, consider the CallerFilePath, CallerMethodName and CallerLineNumber attributes in the System.Runtime.CompilerServices namespace. For example:
public void TraceMessage(string message,
[CallerMemberName] string callingMethod = "",
[CallerFilePath] string ca...
Kotlin secondary constructor
...defined in a companion object
Sometimes you want your constructor private and only a factory method available to clients. For now this is only possible with a factory method defined in a companion object:
class C private (s: Int) {
companion object {
fun new(s: String) = C(s.length)
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How do you set the max number of characters for an EditText in Android?
...LengthFilter(MAX_NUM) });
Via xml:
<EditText
android:maxLength="@integer/max_edittext_length"
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Retrieve column names from java.sql.ResultSet
...tMetaData rsmd = rs.getMetaData();
String name = rsmd.getColumnName(1);
and you can get the column name from there. If you do
select x as y from table
then rsmd.getColumnLabel() will get you the retrieved label name too.
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Swift: Pass array by reference?
...ify your array (see answers below). Classes are passed by reference. Array and Dictionary in Swift are implemented as structs.
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