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Draw in Canvas by finger, Android
...aint demo in the sdk sample.
Another Sample:
public class MainActivity em>x m>tends Activity {
DrawingView dv ;
private Paint mPaint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dv = new DrawingView(this);
...
How to skip over an element in .map()?
... has some cost, you can use the more general .reduce(). You can generally em>x m>press .map() in terms of .reduce:
someArray.map(function(element) {
return transform(element);
});
can be written as
someArray.reduce(function(result, element) {
result.push(transform(element));
return result;
}, []);...
How do you calculate log base 2 in Java for integers?
...oid FP calculations whenever possible.
Floating-point operations are not em>x m>act. You can never know for sure what will (int)(Math.log(65536)/Math.log(2)) evaluate to. For em>x m>ample, Math.ceil(Math.log(1<<29) / Math.log(2)) is 30 on my PC where mathematically it should be em>x m>actly 29. I didn't fi...
Way to go from recursion to iteration
... on the outside, you just pop an action/continuation off the stack, apply/em>x m>ecute it, push the actions it returned on the stack in reverse in order and repeat. Contingent/complem>x m> traversals, you just capture what would have been local stack variables in reference-counted pointers that you close ov...
Java 8: Lambda-Streams, Filter by Method with Em>x m>ception
I have a problem trying out the Lambda em>x m>pressions of Java 8.
Usually it works fine, but now I have methods that throw IOEm>x m>ception 's.
It's best if you look at the following code:
...
Linq code to select one item
...
Depends how much you like the linq query syntam>x m>, you can use the em>x m>tension methods directly like:
var item = Items.First(i => i.Id == 123);
And if you don't want to throw an error if the list is empty, use FirstOrDefault which returns the default value for the elem...
Can't find the PostgreSQL client library (libpq)
I'm trying to install PostgreSQL for Rails on Mac OS m>X m> 10.6. First I tried the MacPorts install but that didn't go well so I did the one-click DMG install. That seemed to work.
...
Pandas conditional creation of a series/dataframe column
...elect from:
df['color'] = np.where(df['Set']=='Z', 'green', 'red')
For em>x m>ample,
import pandas as pd
import numpy as np
df = pd.DataFrame({'Type':list('ABBC'), 'Set':list('ZZm>X m>Y')})
df['color'] = np.where(df['Set']=='Z', 'green', 'red')
print(df)
yields
Set Type color
0 Z A green
1 ...
python: how to identify if a variable is an array or a scalar
...ad of list.
note: isinstance also supports a tuple of classes, check type(m>x m>) in (..., ...) should be avoided and is unnecessary.
You may also wanna check not isinstance(m>x m>, (str, unicode))
share
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List of Delphi language features and version in which they were introduced/deprecated
...e to point out that I have honestly and genuinely searched repeatedly and em>x m>haustively via Google for such a thing, and been unable to find one.
...