implementing input signal with 2 different frequencies for different time span

Hello, I want to simulate a signal with 2 different frequencies for 2 different time span. For example..

ttotal = 0:200

for timespan t1 = 0:100

input signal fi= cos (w1*t1)

for timespan t2 = 100:200

input signal fi = cos (w2*t2)

for 0:100 the w1(frequency) is different and for 100:200 the w2 (frequency) is different.

in this w1 and w2 values are different .,,i have code for input signal with constant frequency for whole time span and i want to simulate it for changing frequency for different time span as above mentioned.

in the following code time span is 0:200 and input signal is

fi = cos (10*timespan)

here w = 10

**********************************

Tspan= 0:0.01:200; % time vector

fi = cos(10*Tspan)

ti=Tspan;

[T,Y]=ode45(@(t,y) myeqd(t,y,ti,fi),Tspan,[1;1;30]);

plot (T,Y)

************************** could any one tell me how to do it ? is parallel simulation is possible in MATLAB ? and if possible then how to do it ?

Answer 1

[Azzi Abdelmalek]

I don't think that you need a parallel computing. You just need concatenation

w1=10;
w2=20;
Tspan1=0:0.01:100;
Tspan2= 100.01:0.1:200;
fi1 = cos(w1*Tspan1);
fi2 = cos(w2*Tspan2);
Tspan=[Tspan1 Tspan2];
fi=[fi1 fi2]
ti=Tspan;
[T,Y]=ode45(@(t,y) myeqd(t,y,ti,fi),Tspan,[1;1;30]);
plot (T,Y)

[Aniket]

Thank you Azzi ..this works ...