Subtraction between matrix elements

Hello,

This should be straight forward but I can't seem to get the syntax correct. Basically, I have a matrix of (x, y) coordinates in a 4 by two matrix. And I want to calculate the distance between y values. By issue is that some of the coordinates have negative values. I know for scaler values this works

a=  3; b= -5; c= a-b;

but

% these are the array values
0  0.750000000000000
0  0
0  -0.500000000000000
0  -0.750000000000000

% I have tried both of these

DistY2 = minus(line1 (1,2), line (3,2)); 
DistY2 = (line1 (1,2) - line (3,2));

% and the error I get is below Undefined operator '-' for input arguments of type 'matlab.graphics.primitive.Line'.

Error in PlotCurve (line 50) DistY2 = (line1 (1,2)- line (3,2));

[Stephen23]

Duplicate:

https://www.mathworks.com/matlabcentral/answers/414567-subtraction-of-negative-matrix-element