Question

In the following code, I need 1 lakh samples in the array mydata. I don’t know what I am getting out of mydata. Do I have to increase the range of t to get that. And how can I use the data in mydata into another .m file for further processing.

t  = [ 1 : 1 : 500]; % Time Samples
f1=10000; % Input Signal Frequency
f2=20000;
f3=30000;
f4=f2+f3;
f5=f1+f3;
f6=f4+f2;
f7=f1+f6;
f8=45000;
f9=55000;
f10=35000;
mydata=[1:100000];
Fs = 100000; % Sampling Frequency
for i=1:100000
    if(i<=10000)
        mydata = sin(2*pi*f1/Fs*t);
    elseif((i>10000)&&(i<=20000))
       mydata=sin(2*pi*f2/Fs*t);
    elseif((i>20000)&&(i<=30000))
        mydata=sin(2*pi*f3/Fs*t);
    elseif((i>30000)&&(i<=40000))
        mydata=sin(2*pi*f4/Fs*t);
    elseif((i>40000)&&(i<=50000))
        mydata=sin(2*pi*f5/Fs*t);
    elseif((i>50000)&&(i<=60000))
        mydata=sin(2*pi*f6/Fs*t);
    elseif((i>60000)&&(i<=70000))
        mydata=sin(2*pi*f7/Fs*t);
    elseif((i>70000)&&(i<=80000))
        mydata=sin(2*pi*f8/Fs*t);
    elseif((i>80000)&&(i<=90000))
        mydata=sin(2*pi*f9/Fs*t);
    elseif((i>90000)&&(i<=100000))
        mydata=sin(2*pi*f10/Fs*t);
    end
end
stem(mydata)

Answer 1

your code doesn’t do very much; you know that, right?
if we don’t know/understand what you want, we can’t help..

and for anyone else: 1 lakh = 100 000 (http://en.wikipedia.org/wiki/Lakh)

edit: are you trying to produce an array of 100000 samples, consisting of a fixed number of points from different sine waves? aka:

[sin(1.0*pi*[0:10])  sin(2.0*pi*[0:10] sin(1.5*pi*[0:10] (etc) ]

edit2: you repeated your earlier question (which was already answered): How can I generate a sine wave with different frequencies using matlab?