How to make a piecewise function without using syms?

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Brianna Miranda ，2021-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/1611665-how-to-make-a-piecewise-function-without-using-syms

评论： Mathieu NOE ，2021-12-17

Screen Shot 2021-12-15 at 10.42.31 AM.png

I am trying to plot the following piecewise function without using syms but it plots as a horizontal line. This is the code I'm using. The issue isn't the <=, I have tried several different combinations of them (0<=n && n<=4, 0<=n & n<=4, 0<=n<=4) and the code still does not work.

dt = .1;
n = -31:dt:31;
for ii = 1:length(n)
    if 0<=n<=4
        x(ii) = n(ii)./4;
    elseif 4<n<8
        x(ii) = 2-(n(ii)./4);
    else
        x(ii) = 0;
    end
end

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Answer 1

Mathieu NOE 2021-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/1611665-how-to-make-a-piecewise-function-without-using-syms#answer_855855

hello Brianna

try this (using logical arrays)

n = 0:20;
x = zeros(size(n)); % cond 3 by default
% cond 1
ind1 = (0<=n & n<=4);
x(ind1) = n(ind1)/4;
% cond 2
ind2 = (4<n & n<8);
x(ind2) = 2-n(ind2)/4;
plot(n,x);