Matlab getkey

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matlab 循环里面获取键盘输入

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function [ch, tim] = getkey(N,nonascii)
% GETKEY - get a keypress
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CH = GETKEY waits for a single keypress and returns the ASCII code. It
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accepts all ascii characters, including backspace (8), space (32),
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enter (13), etc, that can be typed on the keyboard.
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Non-ascii keys (ctrl, alt, ..) return a NaN. CH is a double.
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CH = GETKEY(N) waits for N keypresses and returns their ASCII codes.
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GETKEY(1) is the same as GETKEY without arguments.
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GETKEY('non-ascii') or GETKEY(N,'non-ascii') uses non-documented
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matlab features to return a string describing the key pressed.
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In this way keys like ctrl, alt, tab etc. can also distinguished.
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The return is a string (when N = 1) or a cell array of strings.
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[CH,T] = GETKEY(...) also returns the time between the start of the
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function and each keypress. This is, however, not that accurat