How can I plot a single vector value

I am working on a set of two .lvm file which are basically the same but from repeated experiment. The time plot was generated and the vector values are 'a' and 'b' as shown below. When I try to average the data, in order to reduce noise, represented by 'y_average' below(I am hoping am correct),I couldn't convert the value I got(174.0020) back to signal plot.

Using "Plot(y_average)" return an empty plot. Can anyone show me the correct code to use or a better way of averaging set of same data taking simultaneously

>> a=plot(d.Segment1.data(:,4)) =174.0016

>> b=plot(e.Segment1.data(:,4)); =174.0023

>> y_average=(1/2)*(a+b)

y_average =

174.0020

>> plot(y_average) : GENERATED EMPTY PLOT

Answer 1

[Walter Roberson]

The result of plot() is a handle graphics handle referencing the graphic.

y_average = mean([d.Segment1.data(:,4), e.Segment1.data(:,4), 2);

Or

y_average = mean([get(a, 'YData'), get(b, 'YData')], 2);

[Osasu]

There was a little error in the syntax which I corrected and it worked. thus: y_average = mean([d.Segment1.data(:,4), e.Segment1.data(:,4)], 2);

The second code didn't work regretabbly.