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How to get an object's properties in JavaScript / jQuery?
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You can look up an object's keys and values by either invoking JavaScript's native for in loop:
var obj = {
foo: 'bar',
base: 'ball'
};
for(var key in obj) {
alert('key: ' + key + '\n' + 'value: ' + obj[key]);
}
or using jQuery's .each()...
Generate a heatmap in MatPlotLib using a scatter data set
...ou can use numpy's histogram2d function:
import numpy as np
import numpy.random
import matplotlib.pyplot as plt
# Generate some test data
x = np.random.randn(8873)
y = np.random.randn(8873)
heatmap, xedges, yedges = np.histogram2d(x, y, bins=50)
extent = [xedges[0], xedges[-1], yedges[0], yedges[...
Efficient evaluation of a function at every cell of a NumPy array
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You could just vectorize the function and then apply it directly to a Numpy array each time you need it:
import numpy as np
def f(x):
return x * x + 3 * x - 2 if x > 0 else x * 5 + 8
f = np.vectorize(f) # or use a different name if you want to keep the...
How do I get the value of text input field using JavaScript?
...e, document.getElementById("searchTxt").value;
Note: Method 2,3,4 and 6 returns a collection of elements, so use [whole_number] to get the desired occurrence. For the first element, use [0],
for the second one use 1, and so on...
Method 2:
Use
document.getElementsByClassName('clas...
bash: shortest way to get n-th column of output
...repeatedly encounter the following form of columnized output from some command in bash (in my case from executing svn st in my Rails working directory):
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Polymorphism in C++
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Understanding of / requirements for polymorphism
To understand polymorphism - as the term is used in Computing Science - it helps to start from a simple test for and definition of it. Consider:
Type1 x;
Type2 y;
f(x)...
How to export JavaScript array info to csv (on client side)?
... this nature but I need to do this using JavaScript. I am using Dojo 1.8 and have all the attribute info in array, which looks like this:
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What is the difference between map and flatMap and a good use case for each?
Can someone explain to me the difference between map and flatMap and what is a good use case for each?
16 Answers
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How to echo with different colors in the Windows command line
I know that the color bf command sets the colors of the whole command line window but I wanted to to print one single line in a different color.
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How to round a number to n decimal places in Java
... to be rounded is 5, it always rounds up to the next number. This is the standard method of rounding most people expect in most situations.
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