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Matplotlib scatterplot; colour as a function of a third variable
...e record, you can apply ALPHA as a colormap if you provide an (n,4) shaped array as c argument, with alpha values in the fourth column. If third variable is Z, with shape=(n,1), then colors = numpy.hstack((numpy.zeros_like(z), numpy.zeros_like(z), numpy.ones_like(z), z/z.max())) gives a very nice e...
How to make the 'cut' command treat same sequental delimiters as one?
...ted to awk:
perl -lane 'print $F[3]' text.txt
However, the @F autosplit array starts at index $F[0] while awk fields start with $1
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Getting image dimensions without reading the entire file
... a new file format you add it to imageFormatDecoders with the key being an array of the "magic bits" which appear at the beginning of every file of the given format and the value being a function which extracts the size from the stream. Most formats are simple enough, the only real stinker is jpeg.
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Rails: Why does find(id) raise an exception in rails? [duplicate]
... id - This can either be a specific id (1), a list of ids (1, 5, 6), or an array of ids ([5, 6, 10]). If no record can be found for all of the listed ids, then RecordNotFound will be raised.
If you don't want the exception to be raised, use find_by_id, which will return nil if it can't find an obj...
Localization of DisplayNameAttribute
..."An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type". However, passing the value to LocalizedDisplayName as a string works. Wish it would be strongly typed.
– Azure SME
Feb 25 '10 ...
ng-model for `` (with directive DEMO)
...Filereader', []).directive('appFilereader', function($q) {
var slice = Array.prototype.slice;
return {
restrict: 'A',
require: '?ngModel',
link: function(scope, element, attrs, ngModel) {
if (!ngModel) return;
ngModel.$render = functi...
Evenly space multiple views within a container view
...ry is here for those interested, and it has a method for evenly spacing an array of views along a particular axis.
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Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...w, class Kmeans below.
"""
if not issparse(X):
X = np.asanyarray(X) # ?
centres = centres.todense() if issparse(centres) \
else centres.copy()
N, dim = X.shape
k, cdim = centres.shape
if dim != cdim:
raise ValueError( "kmeans: X %s and centres %s must...
Is there a difference between copy initialization and direct initialization?
...() and T[] == T* . That is, function types are function pointer types, and array types are pointer-to-element types. This sucks. It can be worked-around by A c3((A())); (parens around the expression).
– Johannes Schaub - litb
Jul 9 '09 at 1:53
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Should methods that throw RuntimeException indicate it in method signature?
...ll
reference; and indexing exceptions, such as attempting to access an
array element through an index that is too large or too small.
Runtime exceptions can occur anywhere in a program, and in a typical
one they can be very numerous. Having to add runtime exceptions in
every method decl...