How to draw the graph of a function that has different structure in its different domain

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Dear all suppose i want to find the graph of a function such that f(x)=4+x/(2+x^2) when x>0 and f(x)=4-x/(2-x^2) for x<=0 .How i can draw the two different forms of a function in different domain in a single graph with x-axis [-1,1].

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Star Strider
Star Strider il 13 Dic 2015
Using logical indexing operations, this works:
f = @(x) (4+x./(2+x.^2)).*(x>0) + (4-x./(2-x.^2)).*(x<0); % Function
x = linspace(-1, 1, 250); % Define ‘x’
figure(1)
plot(x, f(x)) % Plot
grid

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