How to connect the dots

Question

Atom 2012-6-22

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I am plotting with plot(x,var(x),'o')

var(x) is the variance. These points (x,var(x)) are the discrete points in a x-var(x) plane. How write the plot command so the there discrete points be joined by st. line (or a smooth curve)

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Walter Roberson 2012-6-22

variance essentially applies to an unordered list of points (a "multi-set"): each of the unique permutations of x necessarily has the same variance. That would not often be referred to as "discrete points" in the plane.

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Answer 1

Thomas 2012-6-22

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Dunno if this is what you want..

DO realize that var(x) is a single scalar value as the variance of x

x=rand(10,1)
y=repmat(var(x),length(x),1)
plot(x,y,'Marker','o')

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Answer 2

Adam Filion 2012-6-22

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You can use

plot(x,var(x),'-o')

to connect the dots. This draws a straight line from one to the next.

EDIT: As Thomas pointed out, var(x) returns a single value, so the above command doesn't connect the dots without using repmat as Thomas suggested to create a vector of matching size.