Three possible solutions:
x = [-2:0.5:16.5];
y = findingy1(x);
figure(1)
plot(x,y)
y = findingy2(x);
figure(2)
plot(x,y)
y = arrayfun(@(i)findingy3(x(i)),1:numel(x));
figure(3)
plot(x,y)
function y = findingy1(x)
y = zeros(size(x));
y(x>=0 & x<=2.5) = 2*x(x>=0 & x<=2.5);
y(x>=2.5 & x<=7) = 5;
y(x>=7 & x<14.5) = 9.6667-0.6667*x(x>=7 & x<14.5);
end
function Y = findingy2(X)
Y = zeros(size(X));
for i = 1:numel(X)
x = X(i);
if x>=0 && x<=2.5
y=2*x;
elseif x>=2.5 && x<=7
y=5;
elseif x>=7 && x<14.5
y = 9.6667-0.6667*x;
else
y=0;
end
Y(i) = y;
end
end
function y = findingy3(x)
if x>=0 && x<=2.5
y=2*x;
elseif x>=2.5 && x<=7
y=5;
elseif x>=7 && x<14.5
y = 9.6667-0.6667*x;
else
y = 0;
end
end
