Creating a matrix of sinusoids with frequency increasing over columns and time increasing over rows

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Nate
Nate 2014-10-3
评论： Matt J 2014-10-3
I need to create a matrix/array of sinusoids with time vector increasing along rows and frequency vector increasing along columns.
t = a:int:b
f = c:int:d
y(t, f) = sin(2*pi*f*t)
The desired result is as follows (column and row headings are added for clarity of the question here):
Y{} =
f0 f1 f2 ... fn
-- --
t0 |sin(2*pi*f0*t0) sin(2*pi*f1*t0) sin(2*pi*f2*t0) ... sin(2*pi*fn*t0)|
t1 |sin(2*pi*f0*t1) sin(2*pi*f1*t1) sin(2*pi*f2*t1) ... sin(2*pi*fn*t1)|
t2 |sin(2*pi*f0*t2) sin(2*pi*f1*t2) sin(2*pi*f2*t2) ... sin(2*pi*fn*t2)|
...| ... ... ... ... ... |
tn |sin(2*pi*f0*tn) sin(2*pi*f1*tn) sin(2*pi*f2*tn) ... sin(2*pi*fn*tn)|
-- --
Help is appreciated, thanks

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采纳的回答

Mohammad Abouali
Mohammad Abouali 2014-10-3
minT=0;
maxT=1;
dT=0.01;
minF=1;
maxF=4;
dF=1;
[Time,frequency]=ndgrid( minT:dT:maxT , minF:dF:maxF );
y=sin(2*pi*frequency.*Time);
plot(Time,y);axis tight

更多回答（1 个）

Rick Rosson
Rick Rosson 2014-10-3
编辑：Rick Rosson 2014-10-3
Fs = 48000;
dt = 1/Fs;
t = (0:dt:0.25-dt)';
Fc = 60*(1:2:15);
y = sin(2*pi*t*Fc);

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