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How do you rotate a two dimensional array?
...trix):
size = len(matrix)
layer_count = size / 2
for layer in range(0, layer_count):
first = layer
last = size - first - 1
print 'Layer %d: first: %d, last: %d' % (layer, first, last)
# 5x5 matrix
matrix = [
[ 0, 1, 2, 3, 4],
[ 5, 6, 6, 8, 9],
[10,11...
Using numpy to build an array of all combinations of two arrays
...
It should be noted that meshgrid only works for smaller range sets, I have a large one and I get error: ValueError: maximum supported dimension for an ndarray is 32, found 69
– mikkom
Oct 20 '19 at 6:54
...
How to use the pass statement?
...the debugger on the 20th iteration of a for... in statement. So:
for t in range(25):
do_a_thing(t)
if t == 20:
pass
with the breakpoint on pass.
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How to wait for all goroutines to finish without using time.Sleep?
... "http://www.somestupidname.com/",
}
for _, url := range urls {
// Increment the WaitGroup counter.
wg.Add(1)
// Launch a goroutine to fetch the URL.
go func(url string) {
// Decrement the...
How to identify numpy types in python?
...##############
# toy array for demo
####################
arr = np.asarray(range(1,100,2))
########################
# The instance check
########################
isinstance(arr,np.ndarray)
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ASP.NET MVC: Custom Validation by DataAnnotation
...model in an action method. The built-in validation attributes are Compare, Range, RegularExpression, Required, StringLength. However we may have scenarios wherein we required validation attributes other than the built-in ones.
Custom Validation Attributes
public class EmployeeModel
{
[Require...
What does this square bracket and parenthesis bracket notation mean [first1,last1)?
I have seen number ranges represented as [first1,last1) and [first2,last2) .
4 Answers
...
From ND to 1D arrays
...r(data_array,col):
vector = []
imax = len(data_array)
for i in range(imax):
vector.append(data_array[i][col])
return ( vector )
a = ([1,2,3], [4,5,6])
b = getVector(a,1)
print(b)
Out>[2,5]
So if you need to transpose, you can do something like this:
def transposeArray(...
Why would $_FILES be empty when uploading files to PHP?
... Not too large any more. We have clients who upload files in the 1-3G range quite regularly. Since they are uploading files onto their own servers, and they are IP whitelisted servers, the exchange is quite normal and merely a way to allow a client to use their equipment the way they want to us...
find vs find_by vs where
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When query value out of range, find_by will rescue ::RangeError from where(*args) and return nil.
– fangxing
May 6 '19 at 8:39
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