Store Answers into Matrix

Question

Eric Daiber 2016-9-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/304747-store-answers-into-matrix

回答： Image Analyst 2016-9-27

What does the x = [] and the x = [x;T, y] mean? I know what it does, I am wondering if someone could explain the syntax?

F = @(m,y) 5*m+7*y
x=[];
if true
    for y=2:0.1:10
        T = fzero(@(m) F(m,y), 5)
        x=[x; T,y)];
    end
end

Thanks, Eric

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Answer 1

Image Analyst 2016-9-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/304747-store-answers-into-matrix#answer_236345

x=[] initializes x to null. You need to do this because x must exist when you append to it with the x=[x; T,y)]; statement. The right parenthesis in that line is a mistake. If you don't have x already, then what would it append T and y to? That's why you had to initialize x to an empty matrix.