Index exceeds the number of array elements. Index must not exceed 1.

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Deepti t 2024-2-7

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评论： Sam Chak 2024-2-8

function cost = optimize_PID(k)

assignin('base', 'k', k);

sim('DABvoltagecontrol.slx');

ITAE = load('ITAE.mat');

num_samples = size(ITAE.ans , 1);

ITAE_value = ITAE.ans(1, num_samples);

cost = ITAE_value(num_samples);

end

while executing the code, error is showing : Index exceeds the number of array elements. Index must not exceed 1. the ITAE is loaded to .mat format

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Torsten 2024-2-7

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编辑：Torsten 2024-2-7

在 MATLAB Online 中打开

num_samples = size(ITAE.ans , 1);
ITAE_value = ITAE.ans(1, num_samples);

num_samples is the number of rows of ITAE.ans, but you use it in setting ITAE_value as if it were the number of columns.

Maybe you mean

ITAE_value = ITAE.ans(num_samples,1);

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Deepti t 2024-2-7

Still the error shows.

Index exceeds the number of array elements. Index must not

exceed 1.

Error in optimize_PID (line 7)

cost = ITAE_value(num_samples);

Torsten 2024-2-7

ITAE_value is a scalar - there is no element number num_samples of ITAE_value because there is only one.

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Sam Chak 2024-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/2079181-index-exceeds-the-number-of-array-elements-index-must-not-exceed-1#answer_1404291

在 MATLAB Online 中打开

Hi @Deepti t

I would recommend calculating the ITAE (Integral of Time-weighted Absolute Error) within the Simulink model and connecting the output to the 'Outport' block. This approach is more straightforward. However, it appears that you are searching for a single parameter, k in the 3-gain PID controller, to minimize the ITAE. Here is a code snippet that may help you with that:

function cost = optimize_PID(k)
    assignin('base', 'k', k);
    [t, x, y] = sim('DABvoltagecontrol.slx');
    cost      = y(end, 1);  % number 1 Outport block
end

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Deepti t 2024-2-8

移动：Sam Chak 2024-2-8

I am able to get out.ITAE in the array format and also the cost variable showing the out.ITAE values, but the whole function is not working, " unrecognised field: ITAE"

Sam Chak 2024-2-8

But your error says that out.ITAE is a time series data. Despite setting the To Workspace block to send data as 'Array', it seems that the logged data is still in the 'Time series' format. Am I missing something?

out.ITAE

timeseries

Common Properties:

Name: ''

Time: [328012x1 double]

TimeInfo: [1x1 tsdata.timemetadata]

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