How to run the function again after a error?

Question

Ibrahim A 2021-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/831493-how-to-run-the-function-again-after-a-error

回答： Aditya Patil 2021-5-19

I am having a function where I input a time limit (T_limit) and in the body of the program some independent time(T_7) calculated. I am writing comparing these 2 time varibales, if the T_limit>T_7, function executes normally, but if the T_7 > T_limit, error message thrown and ask user to input a new time(T_limit) and executes the function again with this value. My problem is that, my code stuct in a infinite loop. Is there a way to execute function again with this new variable(T_limit)?

function [motion] = motionPlanning(j_max,a_max,v_max,length,T_limit)
            %... 
            %%% FC2 - Time Violation
            if (T7<T_limit) || (T_limit == 0)
                disp("### MP - FC2 + Time is not violated (DSP) ###" );
                motion.mp_feasibility{1,1} = ["Time Violation ", true]; 
            else
                motion.mp_feasibility{1,1} = ["Time Violation ", false];
                try
                    error("### MP - FC2 + Time has been violated (DSP) ###");
                catch
                    disp("### MP - FC2 + Enter new time limit (DSP) ###");
                    fprintf("New time limit: %d", T_limit);
                    [motion] = motionPlanning(2,0,0,200,T_limit);
                end
            end

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Star Strider 2021-5-16

The problem is that the ‘motionPlanning’ function is calling itself internally. (This is termed ‘recursion’ and is to be avoided.)

Also, the ‘T7’ variable and appraently several others, are not being passed to it. (I have no idea what the structure of the rest of the code is, so if this function is inside another function, it would automatically inherit ‘T7’ from the outer function workspace.)

Ibrahim A 2021-5-16

编辑：Ibrahim A 2021-5-16

This is the main function not in another function. So if i make another function and call motionPlanning inside this function. Would that eliminate recursion?

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Answer 1

Aditya Patil 2021-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/831493-how-to-run-the-function-again-after-a-error#answer_703058

I would recommend separating the logic of the function and the code to take inputs from the user. Two of the possible ways to do this are,

The function can verify the input and throw error if they are invalid. An outer while loop asks for input from the user, calls the functions, and repeats if the function throws an error. Else, the while loop exists.
The outer loop verifies the inputs and calls the function only if the inputs are valid. Else, it asks for the inputs from user again.