## Performance – Project Euler # 28 number of spiral diagonals in Python

Starting with the number 1 and moving clockwise clockwise, a 5 by 5 spiral is formed as follows:

21 22 23 24 25
20 7 8 9 10
19 6 1 2 11
18 5 4 3 12
17 16 15 14 13

It can be verified that the sum of the numbers in the diagonals is 101 (21, 7, 1, 3, 13, 25, 9, 5, 17)

.

What is the sum of the numbers in the diagonals in a spiral of 1001 per 1001 formed in the same way?

``````def calculated_diagonal_rec (n):
"" "Assumes n an odd integer.
returns the total of diagonals of a spiral matrix of size n * n. "" "
total = 1
if n == 1:
total return
right_up = n * n
left_up = right_up - n + 1
left_down = left_up - n + 1
right_down = left_down - n + 1
total + = (right_up + right_down + left_up + left_down)
total return + calculated_diagonal_rec (n - 2)
``````

And for larger numbers:

``````def_diagonal_data_data (n):
"" "Assumes n an odd integer.
returns the total of diagonals of a spiral matrix of size n * n "" "
total = 1
for i in the range (n, 1, -2):
right_up = i * i
left_up = right_up - i + 1
left_down = left_up - i + 1
right_down = left_down - i + 1
total + = (right_up + right_down + left_up + left_down)
total return

yes __name__ == & # 39; __ main __ & # 39;
print (calculate_diagonal_rec (1001))
print (calculated_diagitos_alterno (5001))
``````

## Why does not autofocus work on my Canon EF 70-200mm f / 2.8 L IS II USM?

I bought the EF 70-200mm f / 2.8 L IS II lens and the autofocus does not work. It is not functional. I can use the lens in manual mode but not in autofocus. What could be the cause?

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ThomasLound
reviewed by ThomasLound in
.
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Classification: 5

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BlackHatKings: Proxy Lists
Posted by: ThomasLound
Time of publication: June 30, 2019 at 1:53 p.m.

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ThomasLound
reviewed by ThomasLound in
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## Equipment recommendation: How do you compare the Zeiss Batis 18 mm f / 2.8 and Tokina Firin 20 mm f / 2.0 AF for astrophotography?

You probably do not want to use noise reduction in astrological photography, since algorithms can consider stars as noise!

Normally, when choosing a lens for astrological photography, you want a short focal length and a large aperture area at the same time. You can calculate an "astrophotography index" for the lenses, and the index should be as low as possible. The index is:

I = f * Ntwo

where f is the focal length and N is the aperture number. Example: the index is 141.12 for Zeiss and 80 for Tokina. Therefore, you must obtain the Tokina since it collects 76.5% more light, so you can use 0.57 times the ISO you use for Zeiss. Lower ISO, less noise.

By the way, according to this index, the Samyang 14 mm f / 2.8 is worse than the Tokina 20 mm f / 2.0.

More information: https://www.lonelyspeck.com/lenses-for-milky-way-photography/ – note, however, that your "qualification" (which should be high, not low), is calculated using a Little different formula so the numerical values ​​are not comparable.

Justification of the index formula: opening aperture in units of square length (proportional to ftwo/NORTHtwo) and the field of view in units of angle squared (proportional to 1 / ftwo) dictate how much you can collect light. However, the maximum exposure time is proportional to 1 / f because it does not want star trails, so the light pickup capacity is proportional to 1 / (f * Ntwo), so you'll want as high as possible 1 / (f * Ntwo) or, in other words, as low as possible f * Ntwo.

## wp remote get – wp_remote_get – cURL error 28 – only in the same domain

On my website I use wp_remote_get to get data from mydomain.com/wp-json/wp/v2/pages/75

When I run it on my localhost it works fine, but after sending it to the production server (mydomain.com) suddenly, an error appears:
"CURL error 28: the operation ran out after 5000 milliseconds with 0 bytes received'
+ VPS starts acting crazy (100% CPU usage and memory).

Can not retrieve data from the same domain.. When I changed url to some random REST mockup, it is working again.

How can I get WP REST data in the same domain?

(VPS information: debian 9, php 7.3, curl 7.52.1 and the latest version of wordpress 5.2.2)