how can convert time domain to frequency domain

hi i have problem to convert this time domain to frequency domain please help me

t = [ 0 : 0.001 : 3 ]';

x= 0.7*sin(2*pi*1*t)+0.1*sin(2*pi*50*t);

plot(t,x);

xlabel ("Time in Seconds");

title ("noise signal");

ylabel ("volt"); signal into

Answer 1

[Walter Roberson]

See fft and in particular the first example to see how to label the frequency bins