Plotting discrete piecewise funtion

I have a piecewise function as follows:

f(t) = 0 for t < 0

t for 0 ≤ t < 1

and e −t+1 for t ≥ 1

I'm attempting to sketch x[k]=f(0.5k) with k being counting numbers.

x2=piecewise(t<0,0,0<=t<1,t,exp(-t+1));

x3=x2.*(2.*k);

subplot (4,1,4)

stem(x3)

title('3b.3')

[Patrick Struszczyk]

I keep getting the error :

Error using stem (line 40)

Unable to convert expression into double array.

How can I fix this?

Answer 1

[Asad (Mehrzad) Khoddam]

piecewise function is for symbolic toolbox.

You can use:

t=0:0.1:5.0;
f= t.*(t>=0 & t<1 ) + exp(-t+1).*(t>=1);
plot(t,f);

[Patrick Struszczyk]

Thank you