You are currently testing for anything that is not NaN and mtrw has the right way to do this. If you are interested in testing for finite numbers (is not NaN and is not INF) then you don&#39;t need an inversion and can use:

    np.isfinite(a)

More pythonic and native, an easy read, and often when you want to avoid NaN you also want to avoid INF in my experience.

Just thought I&#39;d toss that out there for folks.

I&#39;m not sure whether this is more or less pythonic...

    a = [i for i in a if i is not np.nan]

To get `array([ 1.,  2.])` from an array `arr = np.array([np.nan, 1, 2])`
You can do : 

```python
 arr[~np.isnan(arr)]
```

OR
```python
arr[arr == arr] 
```

(While : **np.nan == np.nan** is **False**)


A team that I am working on has gotten into the habit of using `&lt;script&gt;` tags in random places in the body of our HTML pages. For example:

    &lt;html&gt;
        &lt;head&gt;&lt;/head&gt;
        &lt;body&gt;
            &lt;div id=&quot;some-div&quot;&gt;
                &lt;script type=&quot;text/javascript&quot;&gt;//some javascript here&lt;/script&gt;
            &lt;/div&gt;
        &lt;/body&gt;
    &lt;/html&gt;

I had not seen this before. It seems to work in the few browsers that I&#39;ve tested. But as far as I know, it&#39;s not valid to put script tags in places like this.

Am I wrong? How bad is it that we are putting script tags within div tags like this? Are there any browser compatibility issues I should be aware of?

Is it bad practice to embed JavaScript into the body of HTML?

I have this script saved in &quot;test.vbs&quot;:

&lt;pre&gt;&lt;code&gt;Set FSO = CreateObject(&quot;Scripting.FileSystemObject&quot;)
Set File = FSO.OpenTextFile(workFolder &amp;&quot;\test.txt&quot;, 2, True)
File.Write &quot;testing&quot;
File.Close
Set File = Nothing
Set FSO = Nothing
Set workFolder = Nothing&lt;/code&gt;&lt;/pre&gt;

When I run the script I want to pass the value of the &quot;workFolder&quot; variable.

How can I do this? Can I do it? Something like &quot;cscript test.vbs workFolder:&#39;C:\temp\&#39;&quot; perhaps?

Bonus question: Is it neccessary to clean up the passed variable with &quot;Set workFolder = Nothing&quot; or does VBSCript do that automatically when it terminates? Maybe &quot;Set File = Nothing&quot; and &quot;Set FSO = Nothing&quot; is unneccessary also? Please let me know if you know the answer to both these questions.

Can I pass an argument to a VBScript (vbs file launched with cscript)?

I need a function that returns non-NaN values from an array. Currently I am doing it this way:

    &gt;&gt;&gt; a = np.array([np.nan, 1, 2])
    &gt;&gt;&gt; a
    array([ NaN,   1.,   2.])

    &gt;&gt;&gt; np.invert(np.isnan(a))
    array([False,  True,  True], dtype=bool)

    &gt;&gt;&gt; a[np.invert(np.isnan(a))]
    array([ 1.,  2.])

Python: 2.6.4
numpy: 1.3.0


Please share if you know a better way,
Thank you

&quot;isnotnan&quot; functionality in numpy, can this be more pythonic?

I need a function that returns non-NaN values from an array. Currently I am doing it this way:
<pre><code class="hljs language-css">>>> a = np.array([np.nan, 1, 2])
>>> a
array([ NaN, 1., 2.])

>>> np.invert(np.isnan(a))
array([False, True, True], dtype=bool)

>>> a[np.invert(np.isnan(a))]
array([ 1., 2.])
</code></pre>
Python: 2.6.4
numpy: 1.3.0
Please share if you know a better way,
Thank you

I&#39;ve got a two-dimensional array,

    string[,] table = {
                           { &quot;aa&quot;, &quot;aaa&quot; },
                           { &quot;bb&quot;, &quot;bbb&quot; }
                       };

And I&#39;d like to `foreach` through it like this,

    foreach (string[] row in table)
    {
        Console.WriteLine(row[0] + &quot; &quot; + row[1]);
    }

But, I get the error:

&gt; Can&#39;t convert type string to string[]

Is there a way I can achieve what I want, i.e. iterate through the first dimension of the array with the iterator variable returning me the one-dimensional array for that row?



How do I &#39;foreach&#39; through a two-dimensional array?

I have the following code:

    String[] where;
    where.append(ContactsContract.Contacts.HAS_PHONE_NUMBER + &quot;=1&quot;);
    where.append(ContactsContract.Contacts.IN_VISIBLE_GROUP + &quot;=1&quot;);

Those two appends are not compiling. How would that work correctly?


How to add new elements to an array?

How can I determine size of an array (length / number of items) in C#?

Array Size (Length) in C#

I&#39;d like to call a function using an array as parameters:

    const x = [&#39;p0&#39;, &#39;p1&#39;, &#39;p2&#39;];
    call_me(x[0], x[1], x[2]); // I don&#39;t like it
    
    function call_me (param0, param1, param2 ) {
      // ...
    }

Is there a better way of passing the contents of `x` into `call_me()`?

Passing an array as a function parameter in JavaScript

I am trying to figure out a way of checking for the existence of a value in an array without iterating through the array.

I am reading a file for a parameter.  I have a long list of parameters I do not want to deal with. I placed these unwanted parameters in an array `@badparams`.

I want to read a new parameter and if it does not exist in `@badparams`, process it. If it does exist in `@badparams`, go to the next read.

How can I check if a Perl array contains a particular value?

I&#39;m curious, whether there is any way to print formatted `numpy.arrays`, e.g., in a way similar to this:

    x = 1.23456
    print &#39;%.3f&#39; % x


If I want to print the `numpy.array` of floats, it prints several decimals, often in &#39;scientific&#39; format, which is rather hard to read even for low-dimensional arrays. However, `numpy.array` apparently has to be printed as a string, i.e., with `%s`. Is there a solution for this? 


How to pretty-print a numpy.array without scientific notation and with given precision?

Suppose I have a numpy array `x = [5, 2, 3, 1, 4, 5]`, `y = [&#39;f&#39;, &#39;o&#39;, &#39;o&#39;, &#39;b&#39;, &#39;a&#39;, &#39;r&#39;]`. I want to select the elements in `y` corresponding to elements in `x` that are greater than 1 and less than 5.

I tried

    x = array([5, 2, 3, 1, 4, 5])
    y = array([&#39;f&#39;,&#39;o&#39;,&#39;o&#39;,&#39;b&#39;,&#39;a&#39;,&#39;r&#39;])
    output = y[x &gt; 1 &amp; x &lt; 5] # desired output is [&#39;o&#39;,&#39;o&#39;,&#39;a&#39;]

but this doesn&#39;t work. How would I do this?

How do I select elements of an array given condition?

I&#39;m currently trying to learn Numpy and Python. Given the following array:

    import numpy as np
    a = np.array([[1,2],[1,2]])

Is there a function that returns the dimensions of `a` (e.g.a is a 2 by 2 array)?

`size()` returns 4 and that doesn&#39;t help very much. 

Numpy array dimensions

How can I plot the empirical CDF of an array of numbers in matplotlib in Python?  I&#39;m looking for the cdf analog of pylab&#39;s &quot;hist&quot; function.

One thing I can think of is:

    from scipy.stats import cumfreq
    a = array([...]) # my array of numbers
    num_bins =  20
    b = cumfreq(a, num_bins)
    plt.plot(b)


How to plot empirical cdf (ecdf)

How can I know the (row, column) index of the minimum of a numpy array/matrix?

For example, if `A = array([[1, 2], [3, 0]])`, I want to get `(1, 1)`

Thanks!

Numpy minimum in (row, column) format

I&#39;m using [lxml][1] to create an XML file from scratch;
having a code like this:

    from lxml import etree
    
    root = etree.Element(&quot;root&quot;)
    root.set(&quot;interesting&quot;, &quot;somewhat&quot;)
    child1 = etree.SubElement(root, &quot;test&quot;)

How do I write root `Element` object to an xml file using `write()` method of `ElementTree` class?


  [1]: http://codespeak.net/lxml/tutorial.html

Write xml file using lxml library in Python

I have this JSON in a file:


```json
{
    &quot;maps&quot;: [
        {
            &quot;id&quot;: &quot;blabla&quot;,
            &quot;iscategorical&quot;: &quot;0&quot;
        },
        {
            &quot;id&quot;: &quot;blabla&quot;,
            &quot;iscategorical&quot;: &quot;0&quot;
        }
    ],
    &quot;masks&quot;: [
        &quot;id&quot;: &quot;valore&quot;
    ],
    &quot;om_points&quot;: &quot;value&quot;,
    &quot;parameters&quot;: [
        &quot;id&quot;: &quot;valore&quot;
    ]
}
```

I wrote this script to print all of the JSON data:

```python
import json
from pprint import pprint

with open(&#39;data.json&#39;) as f:
    data = json.load(f)

pprint(data)
```

This program raises an exception, though:

```nonde
Traceback (most recent call last):
  File &quot;&lt;pyshell#1&gt;&quot;, line 5, in &lt;module&gt;
    data = json.load(f)
  File &quot;/usr/lib/python3.5/json/__init__.py&quot;, line 319, in loads
    return _default_decoder.decode(s)
  File &quot;/usr/lib/python3.5/json/decoder.py&quot;, line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File &quot;/usr/lib/python3.5/json/decoder.py&quot;, line 355, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting &#39;,&#39; delimiter: line 13 column 13 (char 213)
```

How can I parse the JSON and extract its values?

Why can&#39;t Python parse this JSON data?

I&#39;m new to Python... and coming from a mostly Java background, if that accounts for anything.

I&#39;m trying to understand polymorphism in Python. Maybe the problem is that I&#39;m expecting the concepts I already know to project into Python. But I put together the following test code:

    class animal(object):
        &quot;empty animal class&quot;
    
    class dog(animal):
        &quot;empty dog class&quot;
    
    myDog = dog()
    print myDog.__class__ is animal
    print myDog.__class__ is dog

From the polymorphism I&#39;m used to (e.g. java&#39;s `instanceof`), I would expect both of these statements to print true, as an instance of dog *is an* animal and also *is a* dog. But my output is:

    False
    True

 What am I missing?

How does polymorphism work in Python?

I have a script where I launch with popen a shell command.
The problem is that the script doesn&#39;t wait until that popen command is finished and go continues right away.

    om_points = os.popen(command, &quot;w&quot;)
    .....

How can I tell to my Python script to wait until the shell command has finished?

Python popen command. Wait until the command is finished

I have a dictionary of points, say:
    
    &gt;&gt;&gt; points={&#39;a&#39;:(3,4), &#39;b&#39;:(1,2), &#39;c&#39;:(5,5), &#39;d&#39;:(3,3)}

I want to create a new dictionary with all the points whose x and y value is smaller than 5, i.e. points &#39;a&#39;, &#39;b&#39; and &#39;d&#39;.

According to the [the book][1], each dictionary has the `items()` function, which returns a list of `(key, pair)`  tuple:

    &gt;&gt;&gt; points.items()
    [(&#39;a&#39;, (3, 4)), (&#39;c&#39;, (5, 5)), (&#39;b&#39;, (1, 2)), (&#39;d&#39;, (3, 3))]

So I have written this:

    &gt;&gt;&gt; for item in [i for i in points.items() if i[1][0]&lt;5 and i[1][1]&lt;5]:
    ...     points_small[item[0]]=item[1]
    ...
    &gt;&gt;&gt; points_small
    {&#39;a&#39;: (3, 4), &#39;b&#39;: (1, 2), &#39;d&#39;: (3, 3)}

Is there a more elegant way? I was expecting Python to have some super-awesome `dictionary.filter(f)` function...


  [1]: http://docs.python.org/library/stdtypes.html#mapping-types-dict




How to filter a dictionary according to an arbitrary condition function?

I have a variable `float slope` that sometimes will have a value of `nan` when printed out since a division by` 0` sometimes happens.

I am trying to do an if-else for when that happens. How can I do that? `if (slope == nan)` doesn&#39;t seem to work.


Objective-C - float checking for nan

I have a 2D numpy array. Some of the values in this array are `NaN`. I want to perform certain operations using this array. For example consider the array:

    [[   0.   43.   67.    0.   38.]
     [ 100.   86.   96.  100.   94.]
     [  76.   79.   83.   89.   56.]
     [  88.   NaN   67.   89.   81.]
     [  94.   79.   67.   89.   69.]
     [  88.   79.   58.   72.   63.]
     [  76.   79.   71.   67.   56.]
     [  71.   71.   NaN   56.  100.]]

I am trying to take each row, one at a time, sort it in reversed order to get max 3 values from the row and take their average. The code I tried is:

    # nparr is a 2D numpy array
    for entry in nparr:
        sortedentry = sorted(entry, reverse=True)
        highest_3_values = sortedentry[:3]
        avg_highest_3 = float(sum(highest_3_values)) / 3

This does not work for rows containing `NaN`. My question is, is there a quick way to convert all `NaN` values to zero in the 2D numpy array so that I have no problems with sorting and other things I am trying to do.


convert nan value to zero

Is it possible to set an element of an array to `NaN` in Python?

Additionally, is it possible to set a variable to +/- infinity? If so, is there any function to check whether a number is infinity or not?

Is it possible to set a number to NaN or infinity?

Is there a quick way of replacing all NaN values in a numpy array with (say) the linearly interpolated values?

For example, 

    [1 1 1 nan nan 2 2 nan 0]

would be converted into

    [1 1 1 1.3 1.6 2 2  1  0]

Interpolate NaN values in a numpy array

I am trying to encode an array which contains floats and `NaN` into JSON string from Python using `json.dumps()`.

But the encoded JSON string is not being decoded successfully in PHP. Is the `NaN` causing this problem? How can I work around this situation?

Content Type	Original Author	Original Content on Stackoverflow
Question	AnalyticsBuilder	View Question on Stackoverflow
Solution 1 - Arrays	mtrw	View Answer on Stackoverflow
Solution 2 - Arrays	Ezekiel Kruglick	View Answer on Stackoverflow
Solution 3 - Arrays	Michael Ma	View Answer on Stackoverflow
Solution 4 - Arrays	kaouther	View Answer on Stackoverflow

"isnotnan" functionality in numpy, can this be more pythonic?

Arrays Problem Overview

Arrays Solutions

Solution 1 - Arrays

Solution 2 - Arrays

Solution 3 - Arrays

Solution 4 - Arrays

Can I pass an argument to a VBScript (vbs file launched with cscript)?

Is it bad practice to embed JavaScript into the body of HTML?

Attributions