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qdwang木虫 (小有名气)
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[交流]
【求助】matlab 算法求教
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| 对一数组，其中的元素低于某一常数值a时，使其归0.使用哪什么语句啊。。。我是新人，谢谢。 |
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lidaxue
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nono2009(金币+1):鼓励应助 2010-10-30 06:50:16
qdwang(金币+3): 谢谢你的认真讲解 2011-04-26 09:13:26
nono2009(金币+1):鼓励应助 2010-10-30 06:50:16
qdwang(金币+3): 谢谢你的认真讲解 2011-04-26 09:13:26
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参见 matlab的 help read ++++++++ >> help read --- help for mmreader/read --- READ Read a multimedia file. VIDEO = READ(OBJ) reads in video frames from the associated file. VIDEO is an H x W x B x F matrix where H is the image frame height, W is the image frame width, B is the number of bands in the image (e.g. 3 for RGB), and F is the number of frames read in. The default behavior is to read in all frames unless an index is specified. The type of data returned is always UINT8 data representing RGB24 video frames. VIDEO = READ(...,INDEX) performs the same operation, but reads only the frame(s) specified by INDEX, where the first frame number is 1. INDEX can be a single index, or a two-element array representing an index range of the video stream. For example: VIDEO = READ(OBJ); % Read in all video frames. VIDEO = READ(OBJ, 1); % Read only the first frame. VIDEO = READ(OBJ, [1 10]); % Read the first 10 frames. If any invalid INDEX is specified, MATLAB throws an error. Example: % Construct a multimedia reader object associated with file 'xylophone.mpg' with % user tag set to 'myreader1'. readerobj = mmreader('xylophone.mpg', 'tag', 'myreader1'); % Read in all video frames. vidFrames = read(readerobj); % Get the number of frames. numFrames = get(readerobj, 'numberOfFrames'); % Create a MATLAB movie struct from the video frames. for k = 1 : numFrames mov(k).cdata = vidFrames(:,:,:,k); mov(k).colormap = []; end % Create a figure hf = figure; % Resize figure based on the video's width and height set(hf, 'position', [150 150 readerobj.Width readerobj.Height]) % Playback movie once at the video's frame rate movie(hf, mov, 1, readerobj.FrameRate); See also audiovideo, movie, mmreader, mmreader/get, mmreader/set, mmfileinfo. Overloaded methods: vdspdebug/read eclipseide/read ghsmulti/read daitem/read dagroup/read rfckt.read vrjoystick/read ccsdebug/read wptree/read wdectree/read dtree/read Reference page in Help browser doc mmreader/read >> |
5楼2010-10-29 09:22:31
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