Iterate values into array

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Edward Robson 2020-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/634094-iterate-values-into-array

评论： Peter Perkins 2020-11-20

在 MATLAB Online 中打开

Hi folks,

I have this data,

time = tbl.time;
Vv1 = tbl.Vv1;
Vv2 = tbl.Vv2;
IR6 = tbl.IR6;
f = [];
R  = [];
Ratio = [];
L=[];
M=[];
for x = 3:height(Vv1)
   G = tbl.Vv2(x)/tbl.IR6(x);
   R(x) =[G];
   Ratio = R(x);
   
end
xold=1
for i=1:length(Ratio);
    
    xnew = ((xold-xold^2)*Ratio(i)) ;
    L(i)=xnew;
    M(i)=xold;
    xold=xnew;
end

but for some reason each iteration of xnew and xold arent added to L or M ?

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KSSV 2020-11-2

在 MATLAB Online 中打开

xold=1
for i=1:length(Ratio);    
    xnew = ((xold-xold^2)*Ratio(i)) ;

The above line gives xnew as zero.....this what you want? You need to rethink on your logic.

for x = 3:height(Vv1)
   G = tbl.Vv2(x)/tbl.IR6(x);
   R(x) =[G];
   Ratio = R(x);   
end

The above lines, you need not to use loop.

Peter Perkins 2020-11-20

I don't think either of these loops is necessary. Edward, you should try to rewrite your code with vectorixed operations, it will be faster, shorter, easier to read, and easier to debug.

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