How can i draw the graph of this two functions using matlab

[Rik]

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Answer 1

[Rafael Hernandez-Walls]

when i have this like problem i use this code:

t=linspace(0,2*pi,50);
f=((t>0)&(t<=1)).*2+((t>1)&(t<=pi/2)).*0.5.*t.^2+((t>pi/2)).*cos(t);
plot(t,f)

[Rik]

Why did you post a complete solution to a homework question?

I would also use ... to make each piece of this function more distinct:

t=linspace(0,2*pi,50);
f=  ((t>0)&(t<=1)   ).*2+...
    ((t>1)&(t<=pi/2)).*0.5.*t.^2+...
    ((t>pi/2)       ).*cos(t);
plot(t,f)

[Rafael Hernandez-Walls]

oopps!