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[英]Matlab: How to fix the loop in my code for run a specific code to every table in a cell?
[英]Why is my MATLAB code printing every value within the for loop?
我有將聲音文件分解為 1 秒塊的代碼,計算塊的 RMS,然后繪制所有塊。 它工作正常,直到我編輯它以使其讀取一個文件夾而不是一個用戶一次加載的文件。 現在它打印 fs 的每個值(全部為 32k),這顯然大大減慢了腳本的速度。 這是新腳本:
DirIn = 'D:\Trial'
eval(['filelist=dir(''' DirIn '/*.wav'')'])
for i = 1:length(filelist)
[y,fs] = audioread(strcat(DirIn,'/',filelist(i).name))
npts = length(y);
chunkDur = 1; % length of chunk to analyze in seconds
systemCal = 0; % this should be whatever dB corresponds to an amplitude of 1 in wav file
chunkPts = fs * chunkDur;
rms = [];
for i = 1:chunkPts:npts-chunkPts
chunkRMS = 20 * log10(std(y(i: i + chunkPts))) + systemCal; % rms of chunk in dB
rms = [rms; chunkRMS];
end
t = [0: length(rms) - 1] * chunkDur; % time scale
plot(t, rms)
xlabel('Time (s)');
ylabel('RMS dB');
end
作為參考,這是有效的原件:
npts = length(data);
chunkDur = 1; % length of chunk to analyze in seconds
systemCal = 0; % this should be whatever dB corresponds to an amplitude of 1 in wav file
chunkPts = fs * chunkDur;
rms = [];
for i = 1:chunkPts:npts-chunkPts
chunkRMS = 20 * log10(std(data(i: i + chunkPts))) + systemCal; % rms of chunk in dB
rms = [rms; chunkRMS];
end
t = [0: length(rms) - 1] * chunkDur; % time scale
plot(t, rms)
xlabel('Time (s)');
ylabel('RMS dB');
你錯過了一個分號;
在[y,fs] = audioread(strcat(DirIn,'/',filelist(i).name))
行的末尾。 它表示一行的結束並抑制代碼行的輸出。 在燈架上有一個不錯的博客進入這里。
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