How can I plot a X where my dataset crosses the X axis (y=0), but only when dy/dx > 0?

See above

New to matlab, I have the following code already:

dataset = xlsread('time_series.xlsx');

x = dataset(:,1);

y = dataset(:,2);

plot(x,y)

xlabel('t [s]')

ylabel('mu [m]')

Is there a way I can export the points MatLab have identified?

Thanks

Answer 1

[Star Strider]

To detect the zero-crossings, the code in Easy way of finding zero crossing of a function , and you can interpolate to get the exact independent variable value of the zero-crossings using the code example in Get t co-ordinate based off y co-ordinate. If you use the code in the first loop, the value of ‘B(1)’ (the slope parameter) will tell you if the vector is increasing or decreasing at that point.