Create for loop to simplify code and output arrays

Question

Esme Stanford-Durkin 2020-4-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521308-create-for-loop-to-simplify-code-and-output-arrays

回答： Esme Stanford-Durkin 2020-4-28

I have this code:

len1 = a(4);
st1 = 5; % starting index for first channel
y1 = a(st1: st1+len1-1);
len2 = a(st1+len1);
st2 = st1+len1+1; % starting index for second channel
y2 = a(st2: st2+len2-1);
 
len3 = a(st2+len2);
st3 = st2+len2+1; % starting index for third channel
y3 = a(st3: st3+len3-1);
 
len4 = a(st3+len3);
st4 = st3+len3+1;% starting index for fourth channel
y4 = a(st4: st4+len4-1);

This is taking data from a text file and outputting different values for y (i.e y2 = 1524x1 double).

I know there's a simpler for loop I can do but I can't seem to get it right! Can you help?

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Answer 1

Esme Stanford-Durkin 2020-4-28

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Solution, array to cell needed:

ch = a(1);
len = a(4);
st = 5 ; 
y{1} = a(st: st+len-1);
for i = 2 : ch 
    len(i) = a(st(i-1) + len(i-1 )); 
    st(i) = st(i-1) + len(i-1) + 1 ; 
    y{i} = a(st(i):st(i)+len(i)-1 ); 
end

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Answer 2

Saurav Roy 2020-4-28

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Hey !

I think this is somwhat close to what you are looking for,

num = length(a);
len = a(4);st = 5;
y = a(st: st+num-1);
for i = 2 : num
    
       len(i) = a(st(i-1) + len(i-1));
       st(i) = st(i-1) + len(i-1) + 1;
       y(i) = a(st(i):st(i)+len(i)-1);
    
end