use of for and if

hi everybody

I have these two equations

r1=((Imax-Imin)*t)/DT+Imin;

r2=((Imin-Imax)*t)/(T*(1-D))+Imax;

and I also have the following time array

N=200;

h=T/N;

t=[0:h:T-h];

my question is how can I drow those two equations r1 from t=0...DT and r2 from t=DT...T

DT and T are known variables for me I just want to know how to write the function

thank you!!

Answer 1

[Laura Proctor]

If all values are scalars and t is the only vector, you can just leave the equations as they are and MATLAB will create output vectors for r1 & r2.

For example:

N = 200;
h = T/N;
t = 0:h:T-h
r1=((Imax-Imin)*t(t<=DT)/DT+Imin;
r2=((Imin-Imax)*t(t>=DT & t<T)/(T*(1-D))+Imax;

Answer 2

[Walter Roberson]

idx = find(t >= DT, 1);
plot( t(1:idx), r1(1:idx), 'r', t(idx:end), r2(idx:end), 'g')