MATLAB: How to get MATlab to output the value of a point on a plot

plot

I have a plot of [t,A] where A is a vector with 3 components (Arr,Azz,a). I need to find the value of t when a drops to a negligible value ~10^-3.

Best Answer

Something like this would work:

t = linspace(0,10);
a = exp(-t);
ia = find(a <= 1E-3, 1, 'first');
t_thr = t(ia);
figure(1)
plot(t, a)
hold on
plot(t_thr, a(ia), 'bp')
hold off
grid

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MATLAB: Question about sinc function ploting

To move it in the plot, simply add the appropriate value to the ‘t’ vector:

t=-40.955:0.005:40.960;
u=(200/pi)*(15*sinc(15*t)-3*sinc(3*t));
figure
plot(t-min(t), u)
grid

Experiment to get the result you want.

MATLAB: How to initialize a variable to zero in userdefined matlab function, which should be executed only once then the values should change dynamically

Such cases are handled using persistent variables.

function [ia_avr] = fcn(ia)
    persistent iasum ia_num ia_avr_old
    
    if isempty(iasum) % only runs once
        iasum = 0;
        ia_num = 0;
        ia_avr_old = 0;
    end
    
    iasum = iasum+Ia; 
    if xxxx
        ia_num=ia_num+1;
        ia_avr=ia_avr_old;
    elseif xxxx
        ia_num=ia_num+1;
        ia_avr=iasum/ia_num;
        ia_avr_old=ia_avr;
    else            
        ia_avr=ia_avr_old;
        iasum=0;
        ia_num=0;
    end
end

Best Answer

Related Solutions

MATLAB: Question about sinc function ploting

MATLAB: How to initialize a variable to zero in userdefined matlab function, which should be executed only once then the values should change dynamically

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