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Generics in C#, using type of a variable as parameter [duplicate]
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The point about generics is to give compile-time type safety - which means that types need to be known at compile-time.
You can call generic methods with types only known at execution time, but you have to use reflection:
// For ...
Determine the number of NA values in a column
...ction(x) sum(is.na(x))) %>%
gather(feature, num_nulls) %>%
print(n = 100)
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read complete file without using loop in java
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FileInputStream fis = new FileInputStream(file);
byte[] data = new byte[(int) file.length()];
fis.read(data);
fis.close();
String str = new String(data, "UTF-8");
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Default value of 'boolean' and 'Boolean' in Java
...es have different default values:
boolean -> false
byte, char, short, int, long -> 0
float, double -> 0.0
Note (2): void has a wrapper Void which also has a default of null and is it's only possible value (without using hacks).
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How to do a logical OR operation in shell scripting
...on't think sh supports "==". Use "=" to compare strings and -eq to compare ints.
man test
for more details.
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restrict edittext to single line
...droid:ellipsize="end"
android:layout_weight="1"
android:layout_marginTop="2dp"
android:drawablePadding="10dp"
android:background="@drawable/edittext"
android:drawableLeft="@drawable/folder_full"
android:drawableRight="@drawable/search"
android:paddingLeft="15dp"
andro...
How to hide TabPage from TabControl [duplicate]
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Or optionally: int idx = tabControl1.TabPages.IndexOf(tabPage1); tabControl1.TabPages.RemoveAt(idx);
– Jay
Dec 3 '12 at 6:11
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round up to 2 decimal places in java? [duplicate]
...4568;
DecimalFormat f = new DecimalFormat("##.00");
System.out.println(f.format(d));
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Regex for numbers only
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If you need to tolerate decimal point and thousand marker
var regex = new Regex(@"^-?[0-9][0-9,\.]+$");
You will need a "-", if the number can go negative.
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Difference between Big-O and Little-O Notation
...it still has a lim sup: 4.)
I recommend memorizing how the Big-O notation converts to asymptotic comparisons. The comparisons are easier to remember, but less flexible because you can't say things like nO(1) = P.
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