How to store a vector under a for loop

Question

Maria Gonzalez 2015-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/257673-how-to-store-a-vector-under-a-for-loop

评论： Maria Gonzalez 2015-11-26

Hi, so I want to store theta as a vector under my for loop. But only the last number of theta saves, does anyone know how to get that as a vector?

clear all;
v = 5.8;
u = 1/v;
Psph = [509.35 507.06 504.77 398.20 394.19 389.61 268.71 266.99 265.85];
E = [];
r1= 6731;
r2= 6731;
pi = 3.1416;
theta=[];
for delta = [29 30 31 59 60 61 89 90 91]
      theta = r1*sin(delta)*u;
end
   E = Psph/((r1.^2)*(r2.^2)*4*pi*(u.^2)*sin(delta)*(cos(theta)).^2);
      A = sqrt(E);

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Answer 1

James Tursa 2015-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/257673-how-to-store-a-vector-under-a-for-loop#answer_201279

编辑：James Tursa 2015-11-26

在 MATLAB Online 中打开

theta(delta) = r1*sin(delta)*u; % <-- Added the (delta) indexing

You will also need to change some of your matrix operators to element-wise operators. E.g.,

E = Psph./((r1.^2)*(r2.^2)*4*pi*(u.^2)*sin(delta).*(cos(theta)).^2);

But note that this entire loop:

for delta = [29 30 31 59 60 61 89 90 91]
      theta(delta) = r1*sin(delta)*u;
end

can be replaced with these lines:

      delta = [29 30 31 59 60 61 89 90 91]
      theta = r1*sin(delta)*u;

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Maria Gonzalez 2015-11-26

Thank you very much!

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Answer 2

Andrei Bobrov 2015-11-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/257673-how-to-store-a-vector-under-a-for-loop#answer_201282

在 MATLAB Online 中打开

v = 5.8;
u = 1/v;
Psph = [509.35 507.06 504.77 398.20 394.19 389.61 268.71 266.99 265.85];
r1= 6731;
r2= 6731;
pi = 3.1416;
delta = [29 30 31 59 60 61 89 90 91];
theta = r1*sin(delta)*u;
E = Psph./((r1.^2)*(r2.^2)*4*pi*(u.^2)*sin(delta).*(cos(theta)).^2);
A = sqrt(E);