Attempted to access som(5513.5); index must be a positive integer or logical

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Carolina Homem de Gouveia 2016-12-8

0
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https://ww2.mathworks.cn/matlabcentral/answers/316020-attempted-to-access-som-5513-5-index-must-be-a-positive-integer-or-logical

评论： Carolina Homem de Gouveia 2016-12-8

delay = 0.5; %atraso de 0.5s
echost = 0.7; %força do eco
D = delay*fs;
reverb_som = zeros(size(som));
for i = D+1:1:length(som);
      reverb_som(i) = som(i)+echost*som(i-D);
end;

I've tried rounding i but it still presents the same error. I've also tried switching i for a constant but it's still the same. I really don't know what to do, could you please give hand? Thanks.