Meaning of a sentence in a code

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Raj Arora 2021-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/1612035-meaning-of-a-sentence-in-a-code

编辑： KSSV 2021-12-16

M=3;n=0:30*M-1;
m=0:29;
x=sin(2*pi*0.04*n);
% y=x([1:M:length(x)]);

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Raj Arora 2021-12-16

meaning of commented line?

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Answer 1

KSSV 2021-12-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1612035-meaning-of-a-sentence-in-a-code#answer_856155

编辑：KSSV 2021-12-16

在 MATLAB Online 中打开

You can know it by your self. Just take a print of the values.

M=3;
n=0:30*M-1;
m=0:29;
x=sin(2*pi*0.04*n);
idx = 1:M:length(x)    % generate indices picking every third element of array 
idx = 1×30
     1     4     7    10    13    16    19    22    25    28    31    34    37    40    43    46    49    52    55    58    61    64    67    70    73    76    79    82    85    88
y=x(idx)   % extract the elements 
y = 1×30
         0    0.6845    0.9980    0.7705    0.1253   -0.5878   -0.9823   -0.8443   -0.2487    0.4818    0.9511    0.9048    0.3681   -0.3681   -0.9048   -0.9511   -0.4818    0.2487    0.8443    0.9823    0.5878   -0.1253   -0.7705   -0.9980   -0.6845   -0.0000    0.6845    0.9980    0.7705    0.1253