Plot function with time step

Hello, even if this question was posed in a similar way, I couldn't apply it to my issue, also given the fact I'm very new.

However, I got a set of values (.txt format: A= 4063x1). Thus the y-values are provided, I'd name them y = A{:,1}; Unfortunaly x values are missing, it's just being said time step = 0.000999. That's what is bothering me: how am I generating my line of x-values? It'd be most kind if you'd solve that trivial thing for me. Thx in advance.

Answer 1

[David Hill]

I assume x is time then corresponding to your y-values with the given step starting at zero.

x=0:.000999:4.057938;

[Niklas Kurz]

Thank you so much! (btw. for those who are facing the same problem: last number (4.057938) represents the product of 4062 times 0.000999 to match x and y values)

Answer 2

[Steven Lord]

A slightly different way to create that vector would be to compute integer multiples of the spacing. First I'll make some sample Y data of the correct size:

y = rand(4063, 1);

Now build x.

timestep = 0.000999;
x = (0:numel(y)-1)*timestep;

[Niklas Kurz]

Thank you for your answere as well. Maybe you happen to answere me an additional simple question: If I just want certain rows of my table to be chosen, how to achieve this? By typing y = A{:, 1}; Matlab picks all 4063 values. Pretending I just want to evaluate 2014-4063, what to do?