[英]Help Required With Graph Plotting in MATLAB
I am about to present my work that I have created in MATLAB, but I am having trouble manipulating my data into a presentable form using the plot function. 我将要介绍我在MATLAB中创建的工作,但是在使用plot函数将数据处理为可呈现的形式时遇到了麻烦。
My code looks like this: 我的代码看起来像这样:
[inputname, pathname] = uigetfile('*.wav', 'Select WAV-file');
thumb1 = inputname; %# Get filename information
fprintf('\n%s is being turned into a 30s thumbnail...\n', thumb1);
fprintf('Please wait..!\n\n');
%# load the signal
[y, fs, nb] = wavread(thumb1);
y = mean(y,2); %# stereo, take avrg of 2 channels
%# Calculate frame energy
fWidth = round(fs*10e-3); %# 10ms
numFrames = floor(length(y)/fWidth);
energy = zeros(1,numFrames);
for f=1:numFrames
energy(f) = sum( y((f-1)*fWidth+1:f*fWidth).^2 );
end
Basically I want to plot the energy of the track over time (in seconds). 基本上,我想绘制随时间变化的轨迹能量(以秒为单位)。
plot(energy)
nearly does what I require, but I have an unusual amount of blank space at the end of the track which is not present in the .wav file 几乎可以满足我的要求,但是在曲目的末尾我有非常少的空白空间,.wav文件中没有
.
。 This blank space is the main issue that I'm having.
这个空白是我遇到的主要问题。 Ideally I would like the x axis to be displayed in seconds!
理想情况下,我希望以秒为单位显示x轴! Any help would be much appreciated.
任何帮助将非常感激。
edit1: EDIT1:
Using the first suggested method: 使用第一个建议的方法:
By default, Matlab uses some heuristic rules to choose the limits of graph scales. 默认情况下,Matlab使用一些启发式规则来选择图形比例的极限。 You can override them with the
xlim
and ylim
functions (eg xlim([0 length(energy)])
). 您可以使用
xlim
和ylim
函数覆盖它们(例如xlim([0 length(energy)])
)。
If you want to plot against actual time, you can do something like: 如果要根据实际时间绘图,可以执行以下操作:
t = (0:length(energy)-1) / fs; % Timebase in seconds
plot(t, energy);
There's also 还有
axis tight
which sets "tight" limits for the axis. 设置轴的“紧”限。 See doc: http://www.mathworks.com/help/techdoc/ref/axis.html
参见文档: http : //www.mathworks.com/help/techdoc/ref/axis.html
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