How can I plot in horizontal lines along X axis corresponding to a value on the y axis? [MATLAB]-CodePudding

I have 2 arrays Q and Z. I want to plot Q on the y-axis and Z on the x-axis. The elements of Z are 0s and 1s.

What I want is to draw a horizontal line from one '1' to the next '1'. E.g. in vector Z, the first 1 to the next 1, has its corresponding y value as the first element of Q, Then the 3rd 1 to the fourth 1 has its y value as the 2nd value in Q and so on.

now i will have several _ _ _ (horizontal lines spanning length of the distance between the 1s as plots)

any help will be appreciated.

CodePudding user response：

You can find the endpoints of each horizontal line with find(), then plot the lines with plot.

Q = [1 2 3 4];
Z = [1 0 1 1 0 0 1 1 1 0 1 0 1];
z_endpoints = find(Z);

figure;
for i = 1:numel(Q)
    plot(z_endpoints([i*2-1,i*2]),Q([i,i]))
    hold on
end
hold off

CodePudding user response：

Assuming that Q and Z are column vectors, you could do something like this:

Q2=[Q,Q];
inds=1:numel(Z);
inds=inds(Z==1);
X=reshape(inds',2,numel(inds)/2);

At this point, Q2 and X should have the same dimensions (two-column matrices). Then plot the horizontal lines beside each other:

plot(X,Q2)

Or above each other, starting at x=0 with different lengths:

X2=[zeros(numel(Q),1),diff(X)]
plot(X2,Q2)

I'm not at a computer so I can't confirm details on returned dimensions.

Hope it helps!