Passing one value at a time

3 次查看（过去 30 天）

Sugar Mummy 2021-12-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1619580-passing-one-value-at-a-time

评论： Sugar Mummy 2022-1-4

Hi,

I need to pass one value at a time from matrix. For example, first value would be 0.0087 the loop execute and display that, then 0.0074 and so on...

Any help is appreciated. Thanks in advance.

回答（1 个）

KSSV 2021-12-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1619580-passing-one-value-at-a-time#answer_864980

在 MATLAB Online 中打开

A = rand(5,1) 
A = 5×1
    0.0300
    0.1842
    0.7141
    0.0645
    0.4457
for i = 1:length(A)
    A(i)
end
ans = 0.0300
ans = 0.1842
ans = 0.7141
ans = 0.0645
ans = 0.4457

14 个评论
显示 12更早的评论隐藏 12更早的评论

Walter Roberson 2021-12-30

在 MATLAB Online 中打开

Simulink can receive individual values from MATLAB in at least two different ways:

You can use set_param() to change the value of some parameter of some block. For example you could use set_param to change the resistance for an RLC circuit; OR
You can change a variable in the workspace of the function being used to invoke sim() to run a model (or sometimes you change the base workspace.)

In the first case where you are using set_param() then the name of the parameter in the block has no connection to the name of the variable in the MATLAB workspace. You could set the parameter name 'blkgain' from the content of the MATLAB variable elephant_toes(K) and Simulink would not have to care that the name of the parameter and the name of the MATLAB variable are different.

In the second case where you are changing workspace values, then you have a potential problem: the workspace variable that is changed must match the variable name used inside the Simulink block (such as in a Math block, or an initialization mask). If your simulink block has A.*B+C and you want to iterate through different A values, then you would need to change the MATLAB variable A .

And that could be a problem if A is also the name of the MATLAB variable that also holds all of the values. You cannot somehow tell Simulink to use the "currently selected" value out of the matrix A and somehow tell MATLAB to "select" a particular location inside A for Simulink to focus on. That will not work.

Instead, you are going to have to rename the aggregate variable that has all of the values, so that it does not match the name used inside Simulink. So for example,

All_A = A;
for K = 1 : numel(All_A)
   %MATLAB workspace variable |A| must be changed to the single value that
   %Simulink is to work with this time
   A = ALL_A(K);
   sim(whatever);
end
A = ALL_A;   %restore after