COLS vs getmaxx in ncurses [closed] - ncurses

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Tinkering with ncurses; can't seem to find why I would want to use getmaxyx() instead of LINES and COLS, or vice-versa.
It seems to me that LINES and COLS is already initialized by initscr(), so why would I want to go through the additional step of calling getmaxyx() and setting new variables?

LINES and COLS are the size of the screen, while getmaxyx gives the size of a window. curses applications can have several windows (and rarely more than one screen).

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I have a folder of images.
I want to read all images and do some processing.
But next time if I run the script again, it should not consider already processed image, only new one.
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For a 3d environment I highly prefer to use X/Y as the landscape with Z as up, are there any issues I would run in to using this convention in Bevy?
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I am trying to find something similar to Delphi's string Grid, I haven't found something similar in Tkinter, it should look like this :
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I have a set of timestamps (each corresponding to a student submission), and I wanted to take a look at them graphically. I know criterion uses a KDE and makes a nice plot, and it looks like it depends on the statistics package, which provides a kde function, but I couldn't trace through the code of criterion to see how it's being used.
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What is another way to play sounds in Win RT instead of using Media Element? I'd like to play some "play-and-forget" sounds.
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