compare two vectors plot

Question

yousef Yousef 2016-5-29

评论： yousef Yousef 2016-5-29

Hi,I have 2 vectors of length 1024, I want to take 100 samples equally spaced from each to make a comparison plot?

Answer 1

the cyclist 2016-5-29

编辑：the cyclist 2016-5-29

Of course, it is not possible to do this perfectly evenly spaced, and span the entire vector, so you have to make some compromise somewhere.

Here is one possibility. It will generalize to other cases:

% Some made-up data
N = 1024;
a = sort(rand(1,N));
b = sort(rand(1,N));

% How much to sample
N_sample = 100;

% Create an (almost) uniform sample
sampleIdx = round(linspace(1,N,N_sample));
a_sample = a(sampleIdx);
b_sample = b(sampleIdx);

% Plot
figure
plot(a_sample,b_sample)

Here is the result ...

yousef Yousef 2016-5-29

Perfect ,Thanks,just I notice, the comparison should be done as:

t=1:100;

plot(t,a_sample,t,b_sample)