How to plot with if statement

How to plot with if statement :

I'm trying to plot this equation with if statement, but it didn't work

n=[0:20]
e(n+1)=sin(n+1)
a=2
Trial(n+1)=e(n+1)+a
k=1

for f=Trial(n+1)-k

if f<0,
alfa(n+1)=a
b=2
x=alfa(n+1)+b

else,
d=1
alfa(n+1)=a+d
b=2
c=4
x=alfa(n+1)+b+c
f=n+1

And how to plot (x vs alfa) ?

Answer 1

[Cris LaPierre]

I suggest going through MATLAB Onramp.

• Ch 9 - plotting
• Ch 13 - if statements, for loops