Save variable from a for loop

Question

Sandro Hantke 2020-4-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/518325-save-variable-from-a-for-loop

关闭： MATLAB Answer Bot 2021-8-20

Hello everyone, I have a problem saving the variable TWR as a value, although I assigned it in the last step. Maybe someone can correct the code for me. Thanks!

R=[0.15,-0.1, 0.08, 0.02, -0.05];
%K1=10000;
%qt=19;
Lh=-0.1;
c=0;
Matrix=zeros(100,1);
for i=0.01:0.01:1
    c1=c+i;
    HPR=(1+c1*(-(R/Lh)));
    TWR=prod(HPR(1:end,1:end));
    Matrix(:,c)=TWR;
end
plot(Matrix,c1)

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Answer 1

Ameer Hamza 2020-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/518325-save-variable-from-a-for-loop#answer_426368

编辑：Ameer Hamza 2020-4-16

在 MATLAB Online 中打开

try this

R=[0.15,-0.1, 0.08, 0.02, -0.05];
%K1=10000;
%qt=19;
Lh=-0.1;
c=1;  % index must start from 1
Matrix=zeros(100,1);
for i=0.01:0.01:1
    c1=c+i;
    HPR=(1+c1*(-(R/Lh)));
    TWR=prod(HPR(1:end,1:end));
    Matrix(c)=TWR;
    c = c+1; % index should increment by 1
end
plot(Matrix)

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Stephen23 2020-4-16

在 MATLAB Online 中打开

It is usually simpler and more robust to iterate over indices (rather than iterting over data values):

V  = 0.01:0.01:1;
N = numel(V);
M = nan(1,N);
...
for k = 1:N
    ... do whatever with the data:
    V(k)
    ... store data in output array:
    M(k) = ...
end