dwb178
asked on
Get x axis value at point matlab
Hello all,
I am trying to plot a circle at the min point of a plot. I am able to find the Y min value, however, I am trying to find the value of the X-axis at this point.
Thank you
I am trying to plot a circle at the min point of a plot. I am able to find the Y min value, however, I am trying to find the value of the X-axis at this point.
Thank you
clear all;
R=1600;
L=120e-6;
C=100e-9;
num = [R*L*C 0 R];
den = [R*L*C L R];
subplot(2,1,1)
system=tf(num,den);
[mag,phase]=bode(system,{2.8e5,3e5});
mag=db(mag);
[minvalue,minIndex]=min(mag);
hold on;
bodemag(system,{2.8e5,3e5});
title('Bode plot for question 1');
plot(??,minvalue,'mo');
subplot(2,1,2);
h=bodeplot(system,{2.8e5,3e5});
setoptions(h,'MagVisible','off');
title('');
hold off;
ASKER CERTIFIED SOLUTION
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How do you create the plot? What is x and y variables. In my example I used variable x as x coordinates and y as y coordinates. If you use different variables, use yours instead. Show your code to draw plot if you still have problems.
Sorry, I read the question on my smartphone and didn't see the code. So my accepted answer doesn't actually answer the question.
Here is another answer that should work in case you don't know x and y of your plot, but want to show minimum point on the plot::
Here is another answer that should work in case you don't know x and y of your plot, but want to show minimum point on the plot::
hold on
bodemag(system,{2.8e5,3e5});
h = findobj(gca,'type','line');
for ii=1:numel(h);
x = get(h(ii),'XData');
if numel(x)==0 || any(isnan(x))
continue
end
y = get(h(ii),'YData');
break
end
[minValue,minIndex]=min(y);
plot(x(minIndex),minValue,'mo');
hold off
ASKER
Thanks for the reply. I tried that and keep getting error message:
??? Undefined function or method 'x' for input arguments of type 'double'.