How to stop the program if an array is empty?

Question

Mariana 2020-2-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504873-how-to-stop-the-program-if-an-array-is-empty

评论： Mariana 2020-2-12

signal1 = [1,2,3,4,5,6];
signal2 = [7,8,9,10,11,12];
signal3 = [13,14,15,16,17,18];
signal4 = [19,20,21,22,23,24];
signal5 = [25,26,27,28,29,30];
signal6 = [31,32,33,34,35,36];
bufferSize = 6;
buffer = nan(bufferSize,6);
init = 1;
for i = 1:bufferSize
    empty = sum(isnan(buffer(i,:))); %check status of each row
    if empty == 6
        buffer(i,1) = signal1(init);
        buffer(i,2) = signal2(init);
        buffer(i,3) = signal3(init);
        buffer(i,4) = signal4(init);
        buffer(i,5) = signal5(init);
        buffer(i,6) = signal6(init);
        init = init + 1; %infite number of data as input
        if sum(isnan(signal1(1,init))) > 0
            msgbox('Insufficient data')
            break;
        end
    end
end

I have 6 signals of same size and I take the first value of each one of them and save them in the fist row of my buffer. However, when I change the bufferSize to 7 I have the following error:

Index exceeds matrix dimensions:

Error in test_array (line 28)

buffer(i,1) = signal1(init);

Its because the signal doesnt have enough data to fill the buffer.

I thought that by checking if the signal is expecting a new value before loading would stop the program before the warning, but it didnt worked.

    if sum(isnan(signal1(1,init))) > 0
                msgbox('Insufficient data')
                break;
    end

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Answer 1

Ajay Kumar 2020-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504873-how-to-stop-the-program-if-an-array-is-empty#answer_414998

编辑：Ajay Kumar 2020-2-11

在 MATLAB Online 中打开

Handle the exception using try catch blocks

signal1 = [1,2,3,4,5,6];
signal2 = [7,8,9,10,11,12];
signal3 = [13,14,15,16,17,18];
signal4 = [19,20,21,22,23,24];
signal5 = [25,26,27,28,29,30];
signal6 = [31,32,33,34,35,36];
bufferSize = 6;
buffer = nan(bufferSize,6);
init = 1;
for i = 1:bufferSize
    empty = sum(isnan(buffer(i,:))); %check status of each row
    if empty == 6
        buffer(i,1) = signal1(init);
        buffer(i,2) = signal2(init);
        buffer(i,3) = signal3(init);
        buffer(i,4) = signal4(init);
        buffer(i,5) = signal5(init);
        buffer(i,6) = signal6(init);
        init = init + 1; %infite number of data as input
        try
            signal1(1,init);
        catch
            msgbox(['Insufficient data at position ',num2str(init)])
            break;
        end
    end
end