Databases
StackOverflow2013
Postsdbo
POFunction to move 2d-array elements in python to their "opposite" side
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POFunction to move 2d-array elements in python to their "opposite" side
    primarykey
    data
    text
    <p>I'm currently writing a program for school that will allow me to load a .ppm file into main and then run a series of functions that will allow the user to manipulate the image file displayed (which is also done via another function) in various ways. One of the ways that I need to be able to manipulate this file is by doing a "flip" across the horizontal axis. Therefore I need my function to move the elements of each row to their "opposite" position. For example, if my array looked something like this [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14] I need my function to turn it around [14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]. </p> <p>Note: every 3 elements represent the RGB values of a single pixel, so I am unsure of how the middle 3 elements should behave, I would image that it needs to stay put though.</p> <p>Here is my function so far:</p> <pre><code>def Switch(image_arry, cols, rows): for y in range(rows): for x in range(0, cols): r1 = image_arry[y][x*3] g1 = image_arry[y][x*3+1] b1 = image_arry[y][x*3+2] r2 = image_arry[y][x*3 -3] g2 = image_arry[y][x*3 - 2] b2 = image_arry[y][x*3 - 1] image_arry[y][x*3] = image_arry[y][x*3 -3] image_arry[y][x*3+1] = image_arry[y][x*3 - 2] image_arry[y][x*3+2] = image_arry[y][x*3 - 1] </code></pre> <p>Note: Due to this being for a college course, I am unallowed to use anything in my program that we have not yet covered in this course (it's a 4 month, 100 level course so that scope is not very broad). And I am not allowed to use break, or while(1) statements either. Thank you very much for your help!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USTimmy O'Mahony
    1. USPyrok
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POFunction to move 2d-array elements in python to their "opposite" side
      1. This table or related slice is empty.
      1. VTUpMod
    1. COyou're missing a [ in the "r1" row
      singulars
      1. POFunction to move 2d-array elements in python to their "opposite" side
      1. USkeyser
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload