Storing values from a for loop and plot
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I need to store the data generated for "Signal" and "Noise" and plot "Signal_to_Noise_Fl" vs. "Signal" for all the iterations. (Ndet and NZ are coming from some random numbers generated from randn function)
I keep getting blank plots when I plot either inside or outside the loop. Any suggestion?
for i=1:Ndet %(Signal)
b = 1:NZ; %(Noise)
Signal_to_Noise_Fl=i./b
end
2 个评论
Matt Gaidica
2019-1-26
You need to add the code where you're trying to plot the values.
Chanaka Navarathna
2019-1-26
采纳的回答
Star Strider
2019-1-27
Plot with a marker, and use the hold function:
Ndet = 10;
NZ = 10;
hold all
for i=1:Ndet %(Signal)
for b = 1:NZ %(Noise)
Signal_to_Noise_Fl=i./b;
plot(Signal_to_Noise_Fl, 'pg')
end
end
hold off
8 个评论
Chanaka Navarathna
2019-1-27
编辑：Chanaka Navarathna
2019-1-27
Chanaka Navarathna
2019-1-27
Star Strider
2019-1-27
As always, my pleasure!
I do, although I am not certain what you want to do.
Here is another option:
N = 10000;
E = 10000;
C = 10*10^-6;
Q = 0.6;
f = 1/100;
l = 1;
Counting_Noise = 100;
Ncount=N+randn(N,1)*100;
Ndet = 2.303*Ncount*Q*E*C*l*0.01;
NZ=Counting_Noise+randn(Counting_Noise,1)*20;
for i=1:numel(Ndet) %(Signal)
for b = 1:numel(NZ) %(Noise)
Signal_to_Noise_Fl(i,b)=Ndet(i)./NZ(b);
end
end
figure
plot(Signal_to_Noise_Fl','-g')
Experiment to get the result that you want.
Chanaka Navarathna
2019-1-27
Star Strider
2019-1-27
Try this:
N = 10000;
E = 10000;
C = 10*10^-6;
Q = 0.6;
f = 1/100;
l = 1;
Counting_Noise = 100;
Ncount=N+randn(N,1)*100;
Ndet = 2.303*Ncount*Q*E*C*l*0.01;
NZ=Counting_Noise+randn(Counting_Noise,1)*20;
for i=1:numel(Ndet) %(Signal)
for b = 1:numel(NZ) %(Noise)
Signal_to_Noise_Fl(i,b)=Ndet(i)./NZ(b);
end
end
figure
subplot(2,1,1)
plot(Ndet, Signal_to_Noise_Fl', '.g')
xlabel('Signal')
ylabel('Signal-to-Noise')
title('Signal-to-Noise vs. Signal')
subplot(2,1,2)
plot(NZ, Signal_to_Noise_Fl, '.g')
xlabel('Noise')
ylabel('Signal-to-Noise')
title('Signal-to-Noise vs. Noise')
Chanaka Navarathna
2019-1-27
Star Strider
2019-1-27
It worked for me.
‘Signal_to_Noise’ is a (10000 x 100) double array, ‘Ndet’ (that you describe as ‘Signal’) is a (10000 x 1) double array, and ‘NZ’ (that you describe as ‘Noise’) is a (100 x 1) double array. They should all plot correctly as in my code, and they did for me (in R2018b).
I have no idea what the problem is.
The data I plotted with the code I posted:
Chanaka Navarathna
2019-1-28
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