Error plotting graph, with y behaving similar to step function
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Hi, i want to plot a graph where y=t^2 when t>0 and y=5 when t<0 giving that t=[-5:0.1:5]
t=[-5:0.01:5]
for i=length(t)
if t<0
y(i)=5;
else if t>0
y(i)=t^2;
end
end
end
this doesnt seem to work, it gave me an error that y is undefined. What did I do wrong
采纳的回答
Mischa Kim
2014-5-26
编辑：Mischa Kim
2014-5-26
You could use something like
t = [-5:0.01:5];
y = (t.^2).*(t>0) + 5*(t<=0);
yy = 5*ones(numel(t),1);
yy(t>0) = t(t>0).^2;
plot(t,y,t,yy)
showing two different approaches. As for your code, try
t = [-5:0.01:5];
for i=1:length(t) % compute y for all t
if t(i)<0 % need to compare each component of t
y(i) = 5;
else
y(i) = t(i)^2; % assign y component-wise
end
end
plot(t,y)
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