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How can I open the interactive matplotlib window in IPython notebook?
...pyplot as plt
import seaborn as sns
ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))
ts = ts.cumsum()
df = pd.DataFrame(np.random.randn(1000, 4), index=ts.index,
columns=['A', 'B', 'C', 'D'])
df = df.cumsum()
df.plot(); plt.legend(loc='best') ...
Serialize form data to JSON [duplicate]
...re's a function for this use case:
function getFormData($form){
var unindexed_array = $form.serializeArray();
var indexed_array = {};
$.map(unindexed_array, function(n, i){
indexed_array[n['name']] = n['value'];
});
return indexed_array;
}
Usage:
var $form = $("#for...
How to remove first 10 characters from a string?
...
Substring has two Overloading methods:
public string Substring(int startIndex);//The substring starts at a specified character position and continues to the end of the string.
public string Substring(int startIndex, int length);//The substring starts at a specified character position and taking ...
how to calculate binary search complexity
... The first time value of N would be equal to (L + H), where L is the first index (0) and H is the last index of the list you are searching for. If you are lucky, the element you try to find will be in the middle [eg. You are searching for 18 in the list {16, 17, 18, 19, 20} then you calculate ⌊...
Analyze audio using Fast Fourier Transform
...Nsamples;
float band_power = 0.0;
float harmonic_amplitude=0.0;
int i, out_index;
out_index=0;
for (i = 0; i < Nsamples / 2 + 1; i++)
{
if (i == 1 || i == 2 || i == 4 || i == 8 || i == 17 || i == 33 || i == 66 || i == 132 || i == 264 || i == 511)
{
...
Best way to pretty print a hash
...f you can install a gem. (Depending on your users, you may wish to use the index:false option to turn off displaying array indices.)
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What do the result codes in SVN mean?
...
SVN status columns
$ svn status
L index.html
The output of the command is split into six columns, but that is not obvious because sometimes the columns are empty. Perhaps it would have made more sense to indicate the empty columns with dashes, the way ls -l...
git revert back to certain commit [duplicate]
...
You can revert all your files under your working directory and index by typing following this command
git reset --hard <SHAsum of your commit>
You can also type
git reset --hard HEAD #your current head point
or
git reset --hard HEAD^ #your previous head point
Hope it help...
How can I use a search engine to search for special characters? [closed]
Google strips most special characters from the text they index so it's not a good tool for many troubleshooting-related tasks, such as finding out what the variable "$-" is in perl, or searching for error output that is loaded with special characters.
...
Random record in ActiveRecord
...that using offset is very slow with large dataset, since it actually needs index scan (or table scan, in case clustered index is used like InnoDB). In other words, it's O(N) operation but "WHERE id >= #{rand_id} ORDER BY id ASC LIMIT 1" is O(log N), which is much faster.
– k...