Vector slicing for loop

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P Walter
P Walter 2020-5-17
回答： Ang Feng 2020-5-17
I'm very new to Matlab and stuck right now with a for loop. I'd like to slice the array and grab blocks of 512 Samples. I want to grab the 10 blocks and write them into a new array. My following Code only grabs the first block.
for i=1:10;
blockindex=0;
startpoint = ((blockindex -1)*512)+1;
endpoint = ((blockindex) * 512)+1;
helparray = sound6_(startpoint:1:endpoint);
mic1 = [mic1; + helparray];
blockindex = blockindex + 40;
end
plot(mic1);

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回答（1 个）

Ang Feng
Ang Feng 2020-5-17
I am not 100% sure about what you want to do exactly by 'slice'. If you want to rearrange the signal to a specific format, then the reshape function helps you do that. See the link to reshape:
https://nl.mathworks.com/help/matlab/ref/reshape.html
For a signal stored as array A, and you can just reshape A by the dimension you specify
n = floor(numel(A)/512);
B = reshape(A,[512 n]);
The you have columns of B is a vector of 512 elements, and save the first 10 columns to a new variable is easy.
C = B(:,1:10);
numel is the function to find the number of elements of a matrix.

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