Understanding how to apply for loop ?

Question

chaaru datta 2022-11-4

0
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https://ww2.mathworks.cn/matlabcentral/answers/1843413-understanding-how-to-apply-for-loop

评论： VBBV 2022-11-5

Hello all, I am new to MATLAB and hence finding difficulty in understanding how should I apply for loop in the following case:

for t = 1,2,3.....

s^t = [snr1^(t-1), snr2^(t-1), I^(t-1)]

end

where snr1, snr2 and I are some variables.

I am getting confused due to presence of t-1.

Any help in this regard will be highly appreciated.

4 个评论
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Daniel Neubauer 2022-11-4

在 MATLAB Online 中打开

well that cannot work because how do you want to adress t-1 if there was no previous instance in the first loop?

if you start later it'd work somehow like this:

snr1=2;
snr2=3;
I=1;
n=5;
t=[1:n]
t = 1×5
     1     2     3     4     5
for i=3:5
    s = [snr1^(t(i-1)), snr2^(t(i-2)), I^(t(i-1))]
end
s = 1×3
     4     3     1
s = 1×3
     8     9     1
s = 1×3
    16    27     1

chaaru datta 2022-11-4

编辑：chaaru datta 2022-11-4

This is the part which I am trying to code.

Also "s" at time instant "t" depends on SNR1 at time instant (t-1), SNR3 at time instant (t-1), and I at time instant (t-1).

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Answer 1

VBBV 2022-11-5

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1843413-understanding-how-to-apply-for-loop#answer_1091828

在 MATLAB Online 中打开

SNR1 = rand(1,100).'; % the vector with SNR1 values
SNR3 = rand(1,100).';% the vector with SNR3 values
I = randi([1 100],[1 100]).'; % the integer vector with I values within (1-100)
 
for t = 2:length(SNR1)
    s(t,:) = [SNR1(t-1); SNR3(t-1); I(t-1)].';   
end
T = table(s(:,1),s(:,2),s(:,3),'VariableNames',{'SNR1','SNR3','I'})
T = 100×3 table
SNR1SNR3I_________________

           0          0     0
      0.5286    0.55894    61
     0.32919    0.89355    43
     0.86775    0.43205    21
     0.55857    0.25263    25
     0.75068    0.78974    84
     0.87684    0.35155    93
     0.96913    0.97962    73
    0.046261    0.81734    99
     0.88748    0.59252    96
     0.97548    0.30953    13
    0.063743    0.37548    45
     0.49473     0.4175    84
     0.15575    0.89957    75
     0.84632    0.63998    31
     0.68992    0.57802    14