Function handler in a for loop

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KingsOz 2022-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/1771800-function-handler-in-a-for-loop

评论： KingsOz 2022-8-1

Hi,

I am working on an optimization problem for curve fitting analysis data. I have tried to use a function handler to experess the data so that I can use fmincon to solve the parameters. However, i keep getting error messages : Operator '*' is not supported for operands of type 'function_handle'.

Here is code for the line with the error message:

for i = 1:60
    No = [1.169, 1.724, 0.5, 1.725]; % initial values
    if tp(i,1) < 0.065
        ts(i,1) = P36S2_Steel_Ux(i,1) * @(No) (Lf_ref/Lf_i).^No(1) * (Cs_ref/Cs_i).^No(3) * (Ep_i/Ep_ref).^No(4)* (di/dref).^No(5);
    else
        ts(i,1) = P36S2_Steel_Ux(i,1) * @(No) (Lf_ref/Lf_i).^No(2) * (Cs_ref/Cs_i).^No(3) * (Ep_i/Ep_ref).^No(4)* (di/dref).^No(5);
    end
end

The goal is to find the optimal values for No.

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Jan 2022-8-1

在 MATLAB Online 中打开

The purpose of the "@(No)" is not clear. Either simply omit this part, or create ts as array of function handles:

ts{i,1} = @(No) P36S2_Steel_Ux(i,1) * (Lf_ref/Lf_i).^No(1) * ...
                (Cs_ref/Cs_i).^No(3) * (Ep_i/Ep_ref).^No(4)* (di/dref).^No(5);

You provide No as 1x4 vector. Then accessing No(5) is confusing.

KingsOz 2022-8-1

Sorry I pasted the wrong row vector for (No). (No) should have 5 elements. I will try your suggestion. (No) is a scaling function used in curve fitting a set of analysis data to match a reference data. I have two sets of plots with the same duration along the time axis (0 to 0.295). However, their peak amplitude is different in magnitude and occurs at different instances in time. My goal is to scale one of them to match the other.

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