- compute slope between the two points
- choose the number of points beteween and including the end points (see nPoints variable).
- Given the slope, and point P_1, compute the coordaintes at equally spaced intervals in the direction of P_2.

# Connect two points with invisible vector and evenly spaced markers along the vector between them and Access Marking coordinates to draw circles around them.

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Hi, I am trying to use elements of this solution https://www.mathworks.com/matlabcentral/answers/233078-how-do-i-get-evenly-spaced-marks-in-my-plots to draw an invisible vector between two points, and then place markers along that vector that are equally spaced in increments of 8 units apart. I think this solution has just about everything I need, except I do not know how to access the markers coordinate data in order to draw circles around them using viscircles. Any help would be greatly appreciated.

% The 2 points I am trying to connect

P_1 = [52.7102,41.0737];

P_2 = [30.5984,56.2307];

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### Accepted Answer

Adam Danz
on 29 Jun 2020

Assuming P_1 and P_2 and (x,y) coordinates, the steps are

% P_1 = (x,y)

% P_2 = (x,y)

P_1 = [52.7102,41.0737];

P_2 = [30.5984,56.2307];

plot(P_1(1),P_1(2),'bo')

hold on

plot(P_2(1),P_2(2),'bo')

% Get eq of line

coefs = polyfit([P_1(1),P_2(1)], [P_1(2), P_2(2)],1);

% Get distance

d = sqrt((P_2(1)-P_1(1))^2 + (P_2(2)-P_1(2))^2);

% number of points between and including end points

nPoints = 5;

% Compute distance of each point from P_1

pointDist = linspace(0,d,nPoints);

% Compute (x,y) coordinates of nPoints **in both directions** from P_1

x = P_1(1) + [-1;1].*(pointDist .* sqrt(1/(1+coefs(1)^2)));

y = P_1(2) + [-1;1].*(coefs(1).*pointDist .* sqrt(1/(1+coefs(1)^2)));

% Chose which set of coordinates to use

% Distance should decrease as each coordinate approaches P_2

isDecreasing = all(diff(sqrt((P_2(1)-x).^2 + (P_2(2)-y).^2),1,2) < 0, 2);

x = x(isDecreasing,:);

y = y(isDecreasing,:);

% Add intervals

hold on

plot(x, y, 'r+')

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