MATLAB: How to find X value of given Y close to zero

x value of given y

How to find the value of Y more close to zero first (note Y consists of both positive and negative numbers) and then find the corresponding X value ? Many thanks in advance.

Lets say I have X and Y given by

X=[-51 -41 -31 -21 -11 1 11 21 31 41]
Y=[0.003 -0.002 0.004 0.0002 -0.05 0.0003 -0.001 0.006 0.01 0.0012]

Best Answer

[val,idx] = sort(abs(Y)) ; 
Y(idx)
X(idx)

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MATLAB: Comparing two separate for loops

Use intersect():

Z =[0.0024    0.0019    0.0015    0.0012    0.0010    0.0007    0.0005    0.0003    0.0002]
Y =[0.0031    0.0024    0.0019    0.0015    0.0012    0.0010    0.0007    0.0005    0.0003    0.0002]
X = intersect(Z, Y)

MATLAB: How to separate signals with diffrent frequencies

Add the following lines of code at the bottom of your code (after y=x+randn(size(x)).*sigma;):

ffty = fft(y);
ffty = abs(ffty(1:ceil(length(y)/2)));
ffty(ffty<100)=0;
[~,locs] = findpeaks(ffty);
freqs = (locs-1)/t(end)
signal_1 = sin(2*pi*t*freqs(1))+sin(2*pi*t*freqs(2))+sin(2*pi*t*freqs(3)); % 3-10
signal_2 = sin(2*pi*t*freqs(6))+sin(2*pi*t*freqs(7)); % 50-100
subplot(211), plot(t,signal_1)
subplot(212), plot(t,signal_2)

Best Answer

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MATLAB: Comparing two separate for loops

MATLAB: How to separate signals with diffrent frequencies

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